subject:(Single atoms)

University of New South Wales

1. van der Heijden, Joost. Single atom dynamics in silicon.

Degree: Physics, 2017, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/57306 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:43255/SOURCE01?view=true

► The experimental study of semiconductors has advanced to the point where individual atoms can be addressed in measurements and, more importantly, manipulated. Single atoms are… (more)

▼ The experimental study of semiconductors has advanced to the point where individual atoms can be addressed in measurements and, more importantly, manipulated. Single atoms are of great interest as they provide charge, orbital, and spin degrees of freedom, which can be harnessed for emerging quantum technologies. In this thesis state-of-the-art silicon field-effect transistors have been used to probe and control single atoms. This approach benefits from the availability of a highly-developed fabrication platform for silicon nanostructures. In addition, silicon naturally provides a small density of nuclear spins, producing little magnetic background disturbance.The main focus of this thesis is the investigation of single boron atoms in silicon. The quantum states of holes bound to acceptor atoms are attractive for quantum information processing because of the presence of spin-orbit coupling. Under the right conditions, this gives rise to a strong dipole coupling in a two-level quantum system. Such spin-orbit quantum bits are promising, because of their fast electrical control by local electrodes and long-distance quantum bit coupling via cavity modes.In this thesis single boron atoms have been identified in both electrical transport and rf gate reflectometry measurements of transistors at cryogenic temperatures. A comprehensive study of the Zeeman effect on the four-fold degenerate ground state of an acceptor shows a strong influence of the local environment. Furthermore, measurements on two coupled acceptors demonstrate, for the first time, the interaction between heavy holes and light holes, which is governed by the spin-orbit coupling. Fundamental heavy-light hole relaxation and heavy-light hole mixing have been observed.Additionally, the potential of single-atom transistors to be used as efficient single-electron pumps has been explored in this thesis. Quantized charge pumps are promising single electron sources, which could produce a new quantum standard for the Ampere. A single-atom specific model has been developed to describe the distinctive operation of a silicon single-atom electron pump, as observed in recent experiments, and to investigate possible improvements of this pump.These results demonstrate the distinct dynamical behavior of individual atoms in silicon and thereby show their prospect to be used in the fields of quantum information and quantum metrology. Advisors/Committee Members: Rogge, Sven, Physics, Faculty of Science, UNSW.

Subjects/Keywords: Zeeman effect; Single boron atoms; Silicon

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APA (6^th Edition):

van der Heijden, J. (2017). Single atom dynamics in silicon. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/57306 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:43255/SOURCE01?view=true

Chicago Manual of Style (16^th Edition):

van der Heijden, Joost. “Single atom dynamics in silicon.” 2017. Doctoral Dissertation, University of New South Wales. Accessed January 18, 2021. http://handle.unsw.edu.au/1959.4/57306 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:43255/SOURCE01?view=true.

MLA Handbook (7^th Edition):

van der Heijden, Joost. “Single atom dynamics in silicon.” 2017. Web. 18 Jan 2021.

Vancouver:

van der Heijden J. Single atom dynamics in silicon. [Internet] [Doctoral dissertation]. University of New South Wales; 2017. [cited 2021 Jan 18]. Available from: http://handle.unsw.edu.au/1959.4/57306 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:43255/SOURCE01?view=true.

Council of Science Editors:

van der Heijden J. Single atom dynamics in silicon. [Doctoral Dissertation]. University of New South Wales; 2017. Available from: http://handle.unsw.edu.au/1959.4/57306 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:43255/SOURCE01?view=true

University of Colorado

2. Kaufman, Adam M. Laser-Cooling Atoms to Indistinguishability: Atomic Hong-Ou-Mandel Interference and Entanglement Through Spin-Exchange.

Degree: PhD, Physics, 2015, University of Colorado

URL: https://scholar.colorado.edu/phys_gradetds/140

► In this thesis, I describe the development of and scientific results from a new platform for creating ultracold atoms via single-atom control. We employ… (more)

Subjects/Keywords: Laser cooling; Quantum control; Single atoms; ultracold atoms; Atomic, Molecular and Optical Physics; Quantum Physics

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APA (6^th Edition):

Kaufman, A. M. (2015). Laser-Cooling Atoms to Indistinguishability: Atomic Hong-Ou-Mandel Interference and Entanglement Through Spin-Exchange. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/phys_gradetds/140

Chicago Manual of Style (16^th Edition):

Kaufman, Adam M. “Laser-Cooling Atoms to Indistinguishability: Atomic Hong-Ou-Mandel Interference and Entanglement Through Spin-Exchange.” 2015. Doctoral Dissertation, University of Colorado. Accessed January 18, 2021. https://scholar.colorado.edu/phys_gradetds/140.

MLA Handbook (7^th Edition):

Kaufman, Adam M. “Laser-Cooling Atoms to Indistinguishability: Atomic Hong-Ou-Mandel Interference and Entanglement Through Spin-Exchange.” 2015. Web. 18 Jan 2021.

Vancouver:

Kaufman AM. Laser-Cooling Atoms to Indistinguishability: Atomic Hong-Ou-Mandel Interference and Entanglement Through Spin-Exchange. [Internet] [Doctoral dissertation]. University of Colorado; 2015. [cited 2021 Jan 18]. Available from: https://scholar.colorado.edu/phys_gradetds/140.

Council of Science Editors:

Kaufman AM. Laser-Cooling Atoms to Indistinguishability: Atomic Hong-Ou-Mandel Interference and Entanglement Through Spin-Exchange. [Doctoral Dissertation]. University of Colorado; 2015. Available from: https://scholar.colorado.edu/phys_gradetds/140

Universitat Politècnica de València

3. Liu, Lichen. Heterogeneous Metal Catalysts: From Single Atoms to Nanoclusters and Nanoparticles .

Degree: 2019, Universitat Politècnica de València

URL: http://hdl.handle.net/10251/113169

► Las especies de metal con diferentes tamaños (átomos individuales, nanocristales y nanopartículas) muestran un comportamiento catalítico diferente para diversas reacciones catalíticas heterogéneas. Se ha demostrado… (more)

▼ Las especies de metal con diferentes tamaños (átomos individuales, nanocristales y nanopartículas) muestran un comportamiento catalítico diferente para diversas reacciones catalíticas heterogéneas. Se ha demostrado en la bibliografía que muchos factores que incluyen el tamaño de partícula, la forma, la composición química, la interacción metal-soporte, la interacción metal-reactivo / disolvente, pueden tener influencias significativas sobre las propiedades catalíticas de los catalizadores metálicos. Los desarrollos recientes de metodologías de síntesis bien controladas y herramientas de caracterización avanzada permiten correlacionar las relaciones a nivel molecular. En esta tesis, he llevado a cabo estudios sobre catalizadores metálicos desde átomos individuales hasta nanoclusters y nanopartículas. Al desarrollar nuevas metodologías de síntesis, el tamaño de las especies metálicas puede modularse y usarse como catalizadores modelo para estudiar el efecto del tamaño sobre el comportamiento catalítico de los catalizadores metálicos para la oxidación del CO, la hidrogenación selectiva, la oxidación selectiva y la fotocatálisis. Se ha encontrado que, los átomos metálicos dispersados por separado y los grupos subnanométricos de metal pueden aglomerarse en nanoclusters o nanopartículas más grandes en condiciones de reacción. Para mejorar la estabilidad de los catalizadores subnanométricos de metal, he desarrollado una nueva estrategia para la generación de átomos individuales y clusters en zeolitas. Esas especies subnanométricas de metales son estables en tratamientos de oxidación-reducción a 550 °C. Siguiendo esta nueva metodología de síntesis, este nuevo tipo de materiales puede servir como catalizador modelo para estudiar la evolución de especies subnanométricas de metales en condiciones de reacción. La transformación estructural de las especies subnanométricas de Pt ha sido estudiada mediante microscopía electrónica de transmisión in situ. Se ha demostrado que el tamaño de las especies de Pt está fuertemente relacionado con las condiciones de reacción, que proporcionan importantes conocimientos para comprender el comportamiento de los catalizadores de metales subnanométricos en condiciones de reacción. En la otra línea de investigación para catalizadores de metales no nobles, he desarrollado varias estrategias generales para obtener catalizadores de metales no nobles, ya sea soportados sobre óxidos metálicos o protegidos por capas delgadas de carbono. Estos materiales muestran un rendimiento excelente para varias reacciones importantes, como la hidrogenación quimioselectiva de nitroarenos, incluso cuando se comparan con los catalizadores de metales nobles convencionales. En algunos casos, los catalizadores de metales no nobles pueden incluso alcanzar selectividades para productos inviables que no ha sido posible conseguir en catalizadores de metales nobles convencionales, que es causado por la diferente ruta de reacción en catalizadores de metales no nobles. Sin embargo, la espectroscopía fotoelectrónica de rayos X a… Advisors/Committee Members: Corma Canós, Avelino (advisor).

Subjects/Keywords: Single atoms; Nanoclusters; Nanoparticles; Zeolite; Selective oxidation; Selective Hydrogenation; Photocatalysis; In situ Characterizations

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APA (6^th Edition):

Liu, L. (2019). Heterogeneous Metal Catalysts: From Single Atoms to Nanoclusters and Nanoparticles . (Doctoral Dissertation). Universitat Politècnica de València. Retrieved from http://hdl.handle.net/10251/113169

Chicago Manual of Style (16^th Edition):

Liu, Lichen. “Heterogeneous Metal Catalysts: From Single Atoms to Nanoclusters and Nanoparticles .” 2019. Doctoral Dissertation, Universitat Politècnica de València. Accessed January 18, 2021. http://hdl.handle.net/10251/113169.

MLA Handbook (7^th Edition):

Liu, Lichen. “Heterogeneous Metal Catalysts: From Single Atoms to Nanoclusters and Nanoparticles .” 2019. Web. 18 Jan 2021.

Vancouver:

Liu L. Heterogeneous Metal Catalysts: From Single Atoms to Nanoclusters and Nanoparticles . [Internet] [Doctoral dissertation]. Universitat Politècnica de València; 2019. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/10251/113169.

Council of Science Editors:

Liu L. Heterogeneous Metal Catalysts: From Single Atoms to Nanoclusters and Nanoparticles . [Doctoral Dissertation]. Universitat Politècnica de València; 2019. Available from: http://hdl.handle.net/10251/113169

University of Florida

4. Valderrama, Billy. Investigations of Ion-Irradiated Uranium Dioxide Nuclear Fuel with Laser-Assisted Atom Probe Tomography.

Degree: PhD, Materials Science and Engineering, 2014, University of Florida

URL: https://ufdc.ufl.edu/UFE0046982

► Performance in commercial light water reactors is dictated by the ability of its fuel material, uranium dioxide (UO2), to transport heat generated during the fission… (more)

▼ Performance in commercial light water reactors is dictated by the ability of its fuel material, uranium dioxide (UO2), to transport heat generated during the fission process. It is widely known that the service lifetime is limited by irradiation-induced microstructural changes that degrade the thermal performance of UO2. Studying the role of complex, often interacting mechanisms that occur during the early stages of microstructural evolution presents a challenge. Phenomena of particular interest are the segregation of fission products to form bubbles and their resultant effect on grain boundary (GB) mobility, and the effect of irradiation on fuel stoichiometry. Each mechanism has a profound consequence on fuel thermal conductivity. Several advanced analytical techniques, such as transmission electron microscopy, x-ray diffraction, x-ray photoelectron spectroscopy, etc. have been used to study these mechanisms. However, they each have limitations and cannot individually provide the necessary information for deeper understanding. One technique that has been under utilized is atom probe tomography (APT), which has a unique ability to spatially resolve small-scale chemical variations. APT uses the principle of field ionization to evaporate surface ions for chemical analysis. For low electrical conductivity systems, a pulsed laser is used to thermally assist in the evaporation process. One factor complicating the analysis is that laser-material interactions are poorly understood for oxide materials and literature using this technique with UO2 is lacking. Therefore, an initial systematic study to identify the optimal conditions for the analysis of UO2 using laser-assisted APT was conducted. A comparative study on the evaporation behavior between CeO2 and UO2 was followed. CeO2 was chosen due to its technological relevancy and availability of comparative studies with laser-assisted APT. Dissimilar evaporation behavior between these materials was identified and attributed to differences in laser absorption, oxide stability, and thermal conductivity between the two materials. After the conditions were identified, APT was utilized to study the role of temperature and GB structure on the segregation of Kr. Results indicate that high angle GBs contain more Kr relative to low angle GBs. The methodology presented can be applied to investigate small-scale chemical changes in other oxide materials. ( en ) Advisors/Committee Members: MYERS,MICHELE V (committee chair), NINO,JUAN C (committee member), YANG,YONG (committee member), BASSO,KARI B (committee member).

Subjects/Keywords: Atoms; Evaporation; Ions; Irradiation; Lasers; Mass spectra; Oxides; Single crystals; Stoichiometry; Uranium; apt – uo2

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APA (6^th Edition):

Valderrama, B. (2014). Investigations of Ion-Irradiated Uranium Dioxide Nuclear Fuel with Laser-Assisted Atom Probe Tomography. (Doctoral Dissertation). University of Florida. Retrieved from https://ufdc.ufl.edu/UFE0046982

Chicago Manual of Style (16^th Edition):

Valderrama, Billy. “Investigations of Ion-Irradiated Uranium Dioxide Nuclear Fuel with Laser-Assisted Atom Probe Tomography.” 2014. Doctoral Dissertation, University of Florida. Accessed January 18, 2021. https://ufdc.ufl.edu/UFE0046982.

MLA Handbook (7^th Edition):

Valderrama, Billy. “Investigations of Ion-Irradiated Uranium Dioxide Nuclear Fuel with Laser-Assisted Atom Probe Tomography.” 2014. Web. 18 Jan 2021.

Vancouver:

Valderrama B. Investigations of Ion-Irradiated Uranium Dioxide Nuclear Fuel with Laser-Assisted Atom Probe Tomography. [Internet] [Doctoral dissertation]. University of Florida; 2014. [cited 2021 Jan 18]. Available from: https://ufdc.ufl.edu/UFE0046982.

Council of Science Editors:

Valderrama B. Investigations of Ion-Irradiated Uranium Dioxide Nuclear Fuel with Laser-Assisted Atom Probe Tomography. [Doctoral Dissertation]. University of Florida; 2014. Available from: https://ufdc.ufl.edu/UFE0046982

5. Garcia, Sébastien. Interfaces fibrées entre atomes uniques et photons uniques : Fiber Interfaces between single atoms and single photons.

Degree: Docteur es, Physique, 2015, Paris, Ecole normale supérieure

URL: http://www.theses.fr/2015ENSU0023

►

Dans le cadre de l’étude expérimentale des états quantiques intriqués de particules uniques, il est nécessaire de développer des systèmes compacts, robustes et polyvalents. Motivés… (more)

▼

Dans le cadre de l’étude expérimentale des états quantiques intriqués de particules uniques, il est nécessaire de développer des systèmes compacts, robustes et polyvalents. Motivés par la miniaturisation, la stabilité et la flexibilité apportées par les fibres optiques, nous présentons deux expériences où les fibres optiques servent d’interfaces pour piéger des atomes uniques et collecter les photons uniques émis. Dans un premier temps, en combinant une fibre optique monomode avec une lentille asphérique, un faisceau dipolaire permet de piéger un atome de rubidium unique par blocage collisionnel. Le refroidissement et le taux de pertes par collisions assistées par la lumière dans le piège dipolaire sont augmentés via une modulation de l’intensité du faisceau dipolaire dont l’effet sur la durée de vie de l’atome est expliqué. Une source fibrée de photons uniques à la demande est obtenue avec ce dispositif, produisant des photons dans un mode spatial et temporel à priori bien défini. Dans un second temps, nous présentons la conception d’une expérience couplant optimalement une chaîne d’atomes uniques piégés à une cavité Fabry-Pérot fibrée combinée avec une lentille à forte ouverture numérique pour imager et adresser les atomes individuellement. Un dispositif d’ablation laser de précision submicrométrique est alors construit pour réaliser et analyser in situ les formes de miroirs voulues à l’extrémité des fibres optiques. Nous présentons ensuite les cavités fibrées doublement résonantes avec une biréfringence contrôlée réalisées. Nous décrivons également le système expérimental construit pour la production rapide d’un nuage d’atomes froids et leur transport vers la cavité.

The experimental study of entangled quantum states of single particle ensembles requires development of compact, robust and versatile systems. Motivated by miniaturization, stability and flexibility provided by optical fibers as light wave-guides, we present two experiments where optical fibers are used as interfaces for single atoms trapping and single photons collection into their guided modes. The first experiment combines a single mode fiber with an aspherical lens to produce a dipolar beam in which we trap a single rubidium atom by collisional blockade. This fiber-pigtailed optical tweezer is a simple, compact and versatile tool for single cold atom production. Cooling and light-assisted collisional loss rate in the dipole trap are increased by modulating the dipole beam intensity. The modulation and beam polarization effects on atom lifetime are presented and explained. With this setup, we realized a triggered single photon source, whose photons have a priori well defined spatial and spectral mode due to the optical fiber and the atomic transition.In a second part, we present the design of an experiment which optimally couples a trapped single atom register to a fiber Fabry-Pérot cavity and where a high numerical aperture lens allows for individual imaging and addressing. A sub-micron precision laser ablation setup is built to create and to…

Advisors/Committee Members: Reichel, Jakob (thesis director).

Subjects/Keywords: Atomes froids uniques; Pince optique fibrée; Photons uniques; Single cold atoms; Fiber-pigtailed optical tweezer; Single photons; 530

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APA (6^th Edition):

Garcia, S. (2015). Interfaces fibrées entre atomes uniques et photons uniques : Fiber Interfaces between single atoms and single photons. (Doctoral Dissertation). Paris, Ecole normale supérieure. Retrieved from http://www.theses.fr/2015ENSU0023

Chicago Manual of Style (16^th Edition):

Garcia, Sébastien. “Interfaces fibrées entre atomes uniques et photons uniques : Fiber Interfaces between single atoms and single photons.” 2015. Doctoral Dissertation, Paris, Ecole normale supérieure. Accessed January 18, 2021. http://www.theses.fr/2015ENSU0023.

MLA Handbook (7^th Edition):

Garcia, Sébastien. “Interfaces fibrées entre atomes uniques et photons uniques : Fiber Interfaces between single atoms and single photons.” 2015. Web. 18 Jan 2021.

Vancouver:

Garcia S. Interfaces fibrées entre atomes uniques et photons uniques : Fiber Interfaces between single atoms and single photons. [Internet] [Doctoral dissertation]. Paris, Ecole normale supérieure; 2015. [cited 2021 Jan 18]. Available from: http://www.theses.fr/2015ENSU0023.

Council of Science Editors:

Garcia S. Interfaces fibrées entre atomes uniques et photons uniques : Fiber Interfaces between single atoms and single photons. [Doctoral Dissertation]. Paris, Ecole normale supérieure; 2015. Available from: http://www.theses.fr/2015ENSU0023

McMaster University

6. Liu, Bo. Structures of the Kalsilite-Like Silicates MTSiO4 (M = Ba, Na/K, Ca/Sr; T = Co, Mg, Zn, Ga, Be).

Degree: MSc, 1992, McMaster University

URL: http://hdl.handle.net/11375/19316

►

A number of silicate compounds BaTSiO4 (T = Co, Mg, Zn), Na0.5K0.5GaSiO4 and Sr1-xCaxBeSiO4 (x = 0.0 ~ 0.4) have been characterized by a… (more)

Subjects/Keywords: structures; silicates; compounds; diffraction; single; crystal; atoms

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APA (6^th Edition):

Liu, B. (1992). Structures of the Kalsilite-Like Silicates MTSiO4 (M = Ba, Na/K, Ca/Sr; T = Co, Mg, Zn, Ga, Be). (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/19316

Chicago Manual of Style (16^th Edition):

Liu, Bo. “Structures of the Kalsilite-Like Silicates MTSiO4 (M = Ba, Na/K, Ca/Sr; T = Co, Mg, Zn, Ga, Be).” 1992. Masters Thesis, McMaster University. Accessed January 18, 2021. http://hdl.handle.net/11375/19316.

MLA Handbook (7^th Edition):

Liu, Bo. “Structures of the Kalsilite-Like Silicates MTSiO4 (M = Ba, Na/K, Ca/Sr; T = Co, Mg, Zn, Ga, Be).” 1992. Web. 18 Jan 2021.

Vancouver:

Liu B. Structures of the Kalsilite-Like Silicates MTSiO4 (M = Ba, Na/K, Ca/Sr; T = Co, Mg, Zn, Ga, Be). [Internet] [Masters thesis]. McMaster University; 1992. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/11375/19316.

Council of Science Editors:

Liu B. Structures of the Kalsilite-Like Silicates MTSiO4 (M = Ba, Na/K, Ca/Sr; T = Co, Mg, Zn, Ga, Be). [Masters Thesis]. McMaster University; 1992. Available from: http://hdl.handle.net/11375/19316

7. Tuchendler, Charles. Nouvelle génération de dispositif à microscope de grande ouverture pour le piégeage d’atomes individuels : New generation of diffraction limited large numerical aperture optics for single atom manipulation.

Degree: Docteur es, Physique, 2014, Palaiseau, Institut d'optique théorique et appliquée

URL: http://www.theses.fr/2014IOTA0012

►

Cette thèse présente les premiers travaux réalisés autour d’un nouveau dispositif expérimental de piégeage d’atomes individuels utilisant une unique lentille asphérique de grande ouverture numérique.… (more)

▼

Cette thèse présente les premiers travaux réalisés autour d’un nouveau dispositif expérimental de piégeage d’atomes individuels utilisant une unique lentille asphérique de grande ouverture numérique. Au cours de cette thèse, nous avons testé les propriétés optiques de la lentille et démontré la formation d’un col laser de 1 µm ainsi qu’un champ transverse sur lequel la lentille est limitée par diffraction de plus ou moins 25 µm. Après avoir démontré la capacité de ce système à piéger des atomes uniques, les caractérisations usuelles des conditions de piégeage ont été conduites: durée de vie, taux de chauffage, polarisation de la lumière de fluorescence, fréquences d’oscillations. Cette thèse s’est intéressée spécifiquement à la distribution d’énergie des atomes uniques piégés. La technique de lâcher et recapture combinée à une étude spectroscopique de l’occupation du piège par les atomes a conduit à la vérification du caractère thermique de la distribution d’énergie des atomes. Par un refroidissement laser combiné à un refroidissement adiabatique, une température minimale de 1,75 µK sans pertes d’atomes est obtenue avec un niveau vibrationnel moyen occupé égal à 4. Ces résultats sont très encourageants dans le contexte de l’information quantique où la température est souvent la principale limite physique à la durée de vie des cohérences d’un bit quantique. La dernière partie de cette thèse revient sur la problématique de la manipulation spatiale d’atomes uniques. Envisagé dans le cadre de la réalisation d’un calculateur quantique, le transfert d’un bit quantique et son déplacement dans l’espace sur une échelle compatible avec les caractéristiques d’un calculateur sont successivement étudiés. Ces travaux ont montré que ni l’état externe des atomes (au travers de leur température) ni leur état interne (à travers la durée de vie des cohérences d’un bit quantique) sont affectés par ce type de manipulations.

This thesis presents the early work done on a new setup that we have developped for trapping single atoms in an optical tweezer using only one diffraction limited large numerical aperture aspheric lens. Together with an experimental optical measurement of a 1µm laser beam waist created by such an aspheric lens, we showed that the diffraction limited transverse field of the lens is about plus or minus 25 µm. The ability of this new setup to trap single atoms is demonstrated and some crucial parameters are then determined : survival time in the dark, heating rate, fluorescence light polarisation, oscillation frequencies. During this PhD, we did focus our attention especially on determining the energy distribution of the single trapped atoms. A release and recapture technique along with the spectroscopic study of the energy levels occupation helped us show a termal behavior of a succession of single atoms in an optical twezer. By using common laser cooling techniques associated with adiabatic down ramping cooling, we showed that a reduction by a factor 100 of the mean energy corresponding to a mean vibrationnal energy…

Advisors/Committee Members: Browaeys, Antoine (thesis director).

Subjects/Keywords: Lentille asphérique; Énergie; Refroidissement; Atomes uniques; Aspheric lens; Energy; Cooling; Single atoms; 530.12; 535.2; 535.5; 535.8

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APA (6^th Edition):

Tuchendler, C. (2014). Nouvelle génération de dispositif à microscope de grande ouverture pour le piégeage d’atomes individuels : New generation of diffraction limited large numerical aperture optics for single atom manipulation. (Doctoral Dissertation). Palaiseau, Institut d'optique théorique et appliquée. Retrieved from http://www.theses.fr/2014IOTA0012

Chicago Manual of Style (16^th Edition):

Tuchendler, Charles. “Nouvelle génération de dispositif à microscope de grande ouverture pour le piégeage d’atomes individuels : New generation of diffraction limited large numerical aperture optics for single atom manipulation.” 2014. Doctoral Dissertation, Palaiseau, Institut d'optique théorique et appliquée. Accessed January 18, 2021. http://www.theses.fr/2014IOTA0012.

MLA Handbook (7^th Edition):

Tuchendler, Charles. “Nouvelle génération de dispositif à microscope de grande ouverture pour le piégeage d’atomes individuels : New generation of diffraction limited large numerical aperture optics for single atom manipulation.” 2014. Web. 18 Jan 2021.

Vancouver:

Tuchendler C. Nouvelle génération de dispositif à microscope de grande ouverture pour le piégeage d’atomes individuels : New generation of diffraction limited large numerical aperture optics for single atom manipulation. [Internet] [Doctoral dissertation]. Palaiseau, Institut d'optique théorique et appliquée; 2014. [cited 2021 Jan 18]. Available from: http://www.theses.fr/2014IOTA0012.

Council of Science Editors:

Tuchendler C. Nouvelle génération de dispositif à microscope de grande ouverture pour le piégeage d’atomes individuels : New generation of diffraction limited large numerical aperture optics for single atom manipulation. [Doctoral Dissertation]. Palaiseau, Institut d'optique théorique et appliquée; 2014. Available from: http://www.theses.fr/2014IOTA0012

University of Oxford

8. Dilley, Jerome Alexander Martin. A single-photon source for quantum networking.

Degree: PhD, 2012, University of Oxford

URL: http://ora.ox.ac.uk/objects/uuid:380a4aaf-e809-4fff-84c7-5b6a0856a6cf ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.572784

► Cavity quantum electrodynamics (cavity QED) with single atoms and single photons provides a promising route toward scalable quantum information processing (QIP) and computing. A strongly… (more)

Subjects/Keywords: 003.54; Atomic and laser physics; quantum optics; cavity QED; cold atoms; single photons; quantum computing; Awesome

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APA (6^th Edition):

Dilley, J. A. M. (2012). A single-photon source for quantum networking. (Doctoral Dissertation). University of Oxford. Retrieved from http://ora.ox.ac.uk/objects/uuid:380a4aaf-e809-4fff-84c7-5b6a0856a6cf ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.572784

Chicago Manual of Style (16^th Edition):

Dilley, Jerome Alexander Martin. “A single-photon source for quantum networking.” 2012. Doctoral Dissertation, University of Oxford. Accessed January 18, 2021. http://ora.ox.ac.uk/objects/uuid:380a4aaf-e809-4fff-84c7-5b6a0856a6cf ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.572784.

MLA Handbook (7^th Edition):

Dilley, Jerome Alexander Martin. “A single-photon source for quantum networking.” 2012. Web. 18 Jan 2021.

Vancouver:

Dilley JAM. A single-photon source for quantum networking. [Internet] [Doctoral dissertation]. University of Oxford; 2012. [cited 2021 Jan 18]. Available from: http://ora.ox.ac.uk/objects/uuid:380a4aaf-e809-4fff-84c7-5b6a0856a6cf ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.572784.

Council of Science Editors:

Dilley JAM. A single-photon source for quantum networking. [Doctoral Dissertation]. University of Oxford; 2012. Available from: http://ora.ox.ac.uk/objects/uuid:380a4aaf-e809-4fff-84c7-5b6a0856a6cf ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.572784

Boston University

9. Chen, Tianhong. Plasmonic atoms and molecules for imaging and sensing.

Degree: PhD, Chemistry, 2016, Boston University

URL: http://hdl.handle.net/2144/14517

► Nanoscale structures play a fundamental role in diverse scientific areas, including biology and information technology. It is necessary to develop methods that can observe nanoscale… (more)

▼ Nanoscale structures play a fundamental role in diverse scientific areas, including biology and information technology. It is necessary to develop methods that can observe nanoscale structures and dynamic processes that involve them. Colloidal plasmonic nanoparticles (plasmonic “atoms”) and their clusters (plasmonic “molecules”) are nanoscale objects with remarkable optical properties that provide new opportunities for sensing and imaging on the relevant length and time scales. Many biology questions require optically monitoring of the dynamic behavior of biological systems on single molecule level. In contrast to the commonly used fluorescent probes which have the problem of bleaching, blinking and relatively weak signals, plasmonic probes display superb brightness, persistency and photostability, thus enable long observation time and high temporal and spacial resolutions. When plasmonic atoms are clustered together, their resonances redshift while the intensities increase as a result of plasmon coupling. These optical responses are dependent on the interparticle gaps and the overall geometry, which makes plasmonic molecules capable of detecting biomolecule clustering and measuring nanometer scale distance fluctuations. In this dissertation, individual plasmonic atoms are firstly evaluated as imaging probe and their interactions with lipid membrane are tested on a newly developed on-chip black lipid membrane system. Subsequently, plasmonic dimers (plasmon rulers) prepared through DNA-programmed self-assembly are monitored to detect the mechanical properties of single biopolymers. Measurement of the spring constant of short (tens of nucleotides or base pairs) DNAs is demonstrated through plasmon coupling microscopy. Colloidal plasmonic atoms of various materials, sizes and shapes scatter vivid colors in the full-visible range. Assembling them into plasmonic molecules provides additional degrees of freedom for color manipulation. More importantly, the electric field in the gaps of plasmonic molecules can be enhanced by several orders of magnitude, which is highly desirable in single molecule sensing applications. In this dissertation, the fundamentals of plasmonic coupling are investigated through one-dimensional gold nanosphere chains. Using the directed self-assembly approach, multichromatic color-switchable plasmonic nanopixels composed of plasmonic atoms and molecules of various materials, sizes, shapes and geometries are integrated in one image with nanometer precision, which facilitates the encoding of complex spectral features with high relevance in security tagging and high density optical data storage.

Subjects/Keywords: Nanoparticles; Materials science; Directed self-assembly; Plasmon coupling; Plasmonic atoms and molecules; Plasmon ruler; Single particle tracking

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Chen, T. (2016). Plasmonic atoms and molecules for imaging and sensing. (Doctoral Dissertation). Boston University. Retrieved from http://hdl.handle.net/2144/14517

Chicago Manual of Style (16^th Edition):

Chen, Tianhong. “Plasmonic atoms and molecules for imaging and sensing.” 2016. Doctoral Dissertation, Boston University. Accessed January 18, 2021. http://hdl.handle.net/2144/14517.

MLA Handbook (7^th Edition):

Chen, Tianhong. “Plasmonic atoms and molecules for imaging and sensing.” 2016. Web. 18 Jan 2021.

Vancouver:

Chen T. Plasmonic atoms and molecules for imaging and sensing. [Internet] [Doctoral dissertation]. Boston University; 2016. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/2144/14517.

Council of Science Editors:

Chen T. Plasmonic atoms and molecules for imaging and sensing. [Doctoral Dissertation]. Boston University; 2016. Available from: http://hdl.handle.net/2144/14517

Georgia Tech

10. Dudin, Yaroslav. Investigations of memory, entanglement, and long-range interactions using ultra-cold atoms.

Degree: PhD, Physics, 2012, Georgia Tech

URL: http://hdl.handle.net/1853/49009

► Long-term storage of quantum information has diverse applications in quantum information science. This work presents an experimental realization of quantum memories with lifetimes greater then… (more)

▼ Long-term storage of quantum information has diverse applications in quantum information science. This work presents an experimental realization of quantum memories with lifetimes greater then 0.1 s. The memories are based on cold rubidium atoms confined in one-dimensional optical lattices. First realization of lattice-based quantum memory and entanglement between a light field and a spin wave is presented in Chapter II. Chapter III describes two different methods (two-photon and magnetic) of compensation for inhomogeneous differential light shifts between the memory levels due to optical trapping potentials, and demonstration of entanglement between a telecom-band light field and a light-shift compensated memory qubit. Highly excited Rydberg atoms present a unique platform for study of strongly correlated systems and quantum information, because of their enormous dipole moments and consequent strong, long-range interactions. In the experiment described in Chapter IV single collective Rydberg excitations are created in a cold atomic gas. After a variable storage period the excitations are converted into light. As the principal quantum number n of the Rydberg level is increased beyond ~ 70, no more than a single excitation is retrieved from the entire mesoscopic ensemble of atoms. In Chapter V, by spatially selective conversion of the spin wave into a light field, we demonstrate that Rydberg-level interactions create long-range correlations of collective atomic excitations. These results hold promise for studies of dynamics and disorder in many-body systems with tunable interactions and for scalable quantum information networks. Chapter VI presents initial observations of coherent many-body Rabi oscillations between the ground level and a Rydberg level using several hundred cold rubidium atoms. The strongly pronounced oscillations indicate a nearly complete excitation blockade of the entire mesoscopic ensemble by a single excited atom. Advisors/Committee Members: Kuzmich, Alex (advisor), Kennedy, Brian (committee member), Amini, Jason (committee member), Brown, Ken (committee member), Tan, Shina (committee member).

Subjects/Keywords: Long-range imteractions; Entanglement; Rydberg atoms; Quantum memory; Single photon; Quantum communication; Quantum entanglement; Quantum statistics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Dudin, Y. (2012). Investigations of memory, entanglement, and long-range interactions using ultra-cold atoms. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/49009

Chicago Manual of Style (16^th Edition):

Dudin, Yaroslav. “Investigations of memory, entanglement, and long-range interactions using ultra-cold atoms.” 2012. Doctoral Dissertation, Georgia Tech. Accessed January 18, 2021. http://hdl.handle.net/1853/49009.

MLA Handbook (7^th Edition):

Dudin, Yaroslav. “Investigations of memory, entanglement, and long-range interactions using ultra-cold atoms.” 2012. Web. 18 Jan 2021.

Vancouver:

Dudin Y. Investigations of memory, entanglement, and long-range interactions using ultra-cold atoms. [Internet] [Doctoral dissertation]. Georgia Tech; 2012. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/1853/49009.

Council of Science Editors:

Dudin Y. Investigations of memory, entanglement, and long-range interactions using ultra-cold atoms. [Doctoral Dissertation]. Georgia Tech; 2012. Available from: http://hdl.handle.net/1853/49009

University of St. Andrews

11. Torralbo Campo, Lara. A compact system for ultracold atoms .

Degree: 2012, University of St. Andrews

URL: http://hdl.handle.net/10023/3192

► This thesis describes the design, construction and optimisation of two compact setups to produce ⁸⁷Rb Bose-Einstein condensates and dual ⁷Li-⁸⁷Rb Magneto-Optical Traps (MOTs). The motivation… (more)

Subjects/Keywords: Bose-Einstein condensation; Light-induced atomic desorption; Ultracold atoms; Dual magneto-optical trap; Bose-Fermi mixtures; Evaporative cooling; Single cell setup

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Torralbo Campo, L. (2012). A compact system for ultracold atoms . (Thesis). University of St. Andrews. Retrieved from http://hdl.handle.net/10023/3192

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Torralbo Campo, Lara. “A compact system for ultracold atoms .” 2012. Thesis, University of St. Andrews. Accessed January 18, 2021. http://hdl.handle.net/10023/3192.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Torralbo Campo, Lara. “A compact system for ultracold atoms .” 2012. Web. 18 Jan 2021.

Vancouver:

Torralbo Campo L. A compact system for ultracold atoms . [Internet] [Thesis]. University of St. Andrews; 2012. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/10023/3192.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Torralbo Campo L. A compact system for ultracold atoms . [Thesis]. University of St. Andrews; 2012. Available from: http://hdl.handle.net/10023/3192

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

12. NGUYEN CHI HUAN. SINGLE ATOMS COUPLED TO A NEAR-CONCENTRIC CAVITY.

Degree: 2018, National University of Singapore

URL: http://scholarbank.nus.edu.sg/handle/10635/149515

Subjects/Keywords: Cavity Quantum Electrodynamics; Quantum Optics; Single atoms; Near-concentric cavities; Optical resonators

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

HUAN, N. C. (2018). SINGLE ATOMS COUPLED TO A NEAR-CONCENTRIC CAVITY. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/149515

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

HUAN, NGUYEN CHI. “SINGLE ATOMS COUPLED TO A NEAR-CONCENTRIC CAVITY.” 2018. Thesis, National University of Singapore. Accessed January 18, 2021. http://scholarbank.nus.edu.sg/handle/10635/149515.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

HUAN, NGUYEN CHI. “SINGLE ATOMS COUPLED TO A NEAR-CONCENTRIC CAVITY.” 2018. Web. 18 Jan 2021.

Vancouver:

HUAN NC. SINGLE ATOMS COUPLED TO A NEAR-CONCENTRIC CAVITY. [Internet] [Thesis]. National University of Singapore; 2018. [cited 2021 Jan 18]. Available from: http://scholarbank.nus.edu.sg/handle/10635/149515.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

HUAN NC. SINGLE ATOMS COUPLED TO A NEAR-CONCENTRIC CAVITY. [Thesis]. National University of Singapore; 2018. Available from: http://scholarbank.nus.edu.sg/handle/10635/149515

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

13. Labuhn, Henning. Rydberg excitation dynamics and correlations in arbitrary 2D arrays of single atoms : La dynamique et correlations d'excitations Rydberg dans des matrices 2D des atomes unique.

Degree: Docteur es, Physique, 2016, Université Paris-Saclay (ComUE)

URL: http://www.theses.fr/2016SACLO002

►

Dans cette thèse, nous mesurons la dynamique cohérente et les corrélations spatiales des excitations Rydberg dans des matrices 2D d’atomes uniques.Nous utilisons un modulateur spatial… (more)

▼

Dans cette thèse, nous mesurons la dynamique cohérente et les corrélations spatiales des excitations Rydberg dans des matrices 2D d’atomes uniques.Nous utilisons un modulateur spatial de lumière pour façonner la phase spatiale d'un faisceau laser de piégeage optique avant de le focaliser avec une lentille asphérique de grande ouverture numérique. En imprimant une phase appropriée sur le faisceau laser, nous pouvons créer des matrices 2D de pièges optiques, de forme arbitraire et facilement reconfigurables, avec jusqu'à 100 pièges séparées de quelques micromètres. Les pièges sont chargés à partir d'un nuage d'atomes froids de 87Rb, et due aux collisions assistées par la lumière, au plus un seul atome peut être présent dans chaque piège en même temps. Une caméra CCD sensible permet en temps réel l'imagerie de la fluorescence atomique émanant des pièges, ce qui nous permet de détecter individuellement la présence d'un atome dans chaque piège avec une précision presque parfaite.Pour créer des interactions importantes entre les atomes uniques, nous les excitons vers des états de Rydberg, qui sont des états électroniques avec un nombre quantique principal élevé.Un faisceau supplémentaire d'adressage permet la manipulation individuelle d'un atome sélectionné dans la matrice.La connaissance précise, de la fois de la matrice des atomes préparé et des positions des excitations Rydberg, nous a permis de mesurer l’augmentation collective de la couplage optique dans le régime de blocage Rydberg, où une seule excitation est partagée de façon symétrique entre tous les atomes de la matrice.Dans le régime où l'interaction ne s’étend que sur quelques sites, nous avons mesuré la dynamique et les corrélations spatiales des excitations Rydberg, dans des matrices d’atomes à une et deux dimensions. La comparaison à une simulation numérique d'un modèle d'Ising quantique d'un système de spin-1/2 montre un accord exceptionnel pour les matrices où l'effet de l'anisotropie de l’interaction Rydberg-Rydberg est faible. Les résultats obtenus démontrent que les atomes Rydberg uniques sont une plate-forme bien adaptée pour la simulation quantique des systèmes de spin.

In this thesis, we measure the coherent dynamics and the pair correlations of Rydberg excitations in two-dimensional arrays of single atoms.We use a spatial light modulator to shape the spatial phase of a single optical dipole trap beam before focusing it with a high numerical-aperture aspheric lens. By imprinting an appropriate phase pattern on the trap beam, we can create arbitrarily shaped and easily reconfigurable 2D arrays of high-quality single-atom traps, with trap-spacings of a few micrometers for up to 100 traps. The traps are loaded from a cloud of cold 87Rb atoms, and due to fast light-assisted collisions of atoms inside the traps, at most one atom can be present in each trap at the same time. A sensitive CCD camera allows the real-time, site-resolved imaging of the atomic fluorescence from the traps, enabling us to detect the presence of an atom in each individual trap…

Advisors/Committee Members: Browaeys, Antoine (thesis director).

Subjects/Keywords: Création des états quantiques; Piégeage d’atomes uniques,; Atomes Rydberg; SLM; Quantum state engineering; Single atom trapping; Rydberg atoms; Spatial light modulator; 530.12; 535.4

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Labuhn, H. (2016). Rydberg excitation dynamics and correlations in arbitrary 2D arrays of single atoms : La dynamique et correlations d'excitations Rydberg dans des matrices 2D des atomes unique. (Doctoral Dissertation). Université Paris-Saclay (ComUE). Retrieved from http://www.theses.fr/2016SACLO002

Chicago Manual of Style (16^th Edition):

Labuhn, Henning. “Rydberg excitation dynamics and correlations in arbitrary 2D arrays of single atoms : La dynamique et correlations d'excitations Rydberg dans des matrices 2D des atomes unique.” 2016. Doctoral Dissertation, Université Paris-Saclay (ComUE). Accessed January 18, 2021. http://www.theses.fr/2016SACLO002.

MLA Handbook (7^th Edition):

Labuhn, Henning. “Rydberg excitation dynamics and correlations in arbitrary 2D arrays of single atoms : La dynamique et correlations d'excitations Rydberg dans des matrices 2D des atomes unique.” 2016. Web. 18 Jan 2021.

Vancouver:

Labuhn H. Rydberg excitation dynamics and correlations in arbitrary 2D arrays of single atoms : La dynamique et correlations d'excitations Rydberg dans des matrices 2D des atomes unique. [Internet] [Doctoral dissertation]. Université Paris-Saclay (ComUE); 2016. [cited 2021 Jan 18]. Available from: http://www.theses.fr/2016SACLO002.

Council of Science Editors:

Labuhn H. Rydberg excitation dynamics and correlations in arbitrary 2D arrays of single atoms : La dynamique et correlations d'excitations Rydberg dans des matrices 2D des atomes unique. [Doctoral Dissertation]. Université Paris-Saclay (ComUE); 2016. Available from: http://www.theses.fr/2016SACLO002

14. Leseleuc de kerouara, Sylvain de. Quantum simulation of spin models with assembled arrays of Rydberg atoms : Simulation quantique de modèles de spins dans des matrices d’atomes de Rydberg.

Degree: Docteur es, Physique, 2018, Université Paris-Saclay (ComUE)

URL: http://www.theses.fr/2018SACLO007

►

Des atomes individuels piégés dans des matrices de pinces optiques et excités vers des états de Rydberg forment une plateforme expérimentale prometteuse pour la simulation… (more)

▼

Des atomes individuels piégés dans des matrices de pinces optiques et excités vers des états de Rydberg forment une plateforme expérimentale prometteuse pour la simulation quantique de modèles de spins. Lors de cette thèse, nous avons d’abord résolu le problème du chargement aléatoire des pièges, seulement 50 % d’entre eux étant chargés avec un atome. Nous avons développé une technique pour préparer des matrices 2D, puis 3D, d’atomes de 87Rb en les déplaçant un par un avec une pince optique mobile contrôlée par ordinateur. Nous avons ensuite réalisé le modèle d’Ising en excitant de manière cohérente les atomes depuis leur état électronique fondamental vers un niveau de Rydberg. Après avoir trouvé un régime optimal où l’interaction dipolaire entre deux atomes de Rydberg se réduit à une énergie de van der Waals, nous avons tenté de préparer adiabatiquement l’état de Néel qui minimise l’énergie d’interaction. Nous avons montré que l’efficacité de préparation étaitlimitée par la décohérence induite par les lasers d’excitation. Nous avons ensuite utilisé un autre régime d’interaction, le couplage dipolaire résonant, pour étudier des modèles de spins de type XY, dont le modèle Su-Schrieffer-Heeger, connu pour sa phase fermionique topologique protégée par une symétrie chirale. Ici, nous avons remplacé les fermions par des particules effectives de type `boson de cœur dur’, ce qui modifie les propriétés de cette phase. Nous avons d’abord retrouvé les propriétés à une particule, comme l’existence d’états de bords à énergie nulle. Nous avons ensuite préparé l’état fondamental à N corps pour un remplissage moitié, et observé sa dégénérescence causée par les états de bords, même en présence d’une perturbation qui lèverait cette dégénérescence dans le cas fermionique. Nous avons expliqué ce résultat par l’existence d’une symétrie plus générale, qui protège la phase bosonique.

Single atoms trapped in arrays of optical tweezers and excited to Rydberg states are a promising experimental platform for the quantum simulation of spin models. In this thesis, we first solved a long-standing challenge to this approach caused by the random loading of the traps, with only 50% of them filled with single atoms. We have engineered a robust and easy-to-use method to assemble perfectly filled two-dimensional arrays of 87Rb atoms by moving them one by one with a moveable optical tweezers controlled by computer, a technique further enhanced to trap, image and assemble three-dimensional arrays. We then implemented the quantum Ising model by coherently coupling ground-state atoms to a Rydberg level. After finding experimental parameters where the dipole-dipole interaction takes the ideal form of a van der Waals shift, we performed adiabatic preparation of the Néel state. We showed that the coherence time of our excitation lasers limited the efficiency of this technique. We then used a different type of interaction, a resonant dipolar coupling, to implement XY spin models and notably the Su-Schrieffer-Heeger model, known for its fermionic…

Advisors/Committee Members: Lahaye, Thierry (thesis director).

Subjects/Keywords: Pinces optique; Atomes individuels; Interaction dipolaire; Modèles de spins; Simulation quantique; Optical tweezers; Single atoms; Dipole-Dipole interaction; Spin models; Quantum simulation; 530.12; 530.144

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Leseleuc de kerouara, S. d. (2018). Quantum simulation of spin models with assembled arrays of Rydberg atoms : Simulation quantique de modèles de spins dans des matrices d’atomes de Rydberg. (Doctoral Dissertation). Université Paris-Saclay (ComUE). Retrieved from http://www.theses.fr/2018SACLO007

Chicago Manual of Style (16^th Edition):

Leseleuc de kerouara, Sylvain de. “Quantum simulation of spin models with assembled arrays of Rydberg atoms : Simulation quantique de modèles de spins dans des matrices d’atomes de Rydberg.” 2018. Doctoral Dissertation, Université Paris-Saclay (ComUE). Accessed January 18, 2021. http://www.theses.fr/2018SACLO007.

MLA Handbook (7^th Edition):

Leseleuc de kerouara, Sylvain de. “Quantum simulation of spin models with assembled arrays of Rydberg atoms : Simulation quantique de modèles de spins dans des matrices d’atomes de Rydberg.” 2018. Web. 18 Jan 2021.

Vancouver:

Leseleuc de kerouara Sd. Quantum simulation of spin models with assembled arrays of Rydberg atoms : Simulation quantique de modèles de spins dans des matrices d’atomes de Rydberg. [Internet] [Doctoral dissertation]. Université Paris-Saclay (ComUE); 2018. [cited 2021 Jan 18]. Available from: http://www.theses.fr/2018SACLO007.

Council of Science Editors:

Leseleuc de kerouara Sd. Quantum simulation of spin models with assembled arrays of Rydberg atoms : Simulation quantique de modèles de spins dans des matrices d’atomes de Rydberg. [Doctoral Dissertation]. Université Paris-Saclay (ComUE); 2018. Available from: http://www.theses.fr/2018SACLO007

15. Lienhard, Vincent. Physique quantique expérimentale à N corps dans des matrices d'atomes de Rydberg. Des modèles de spins à la matière topologique. : Experimental quantum many-body physics with arrays of Rydberg atoms. From spin models to topological matter.

Degree: Docteur es, Physique, 2019, Université Paris-Saclay (ComUE)

URL: http://www.theses.fr/2019SACLO022

►

Des atomes individuels piégés dans des matrices de pinces optiques et excités vers des états de Rydberg forment une plateforme expérimentale performante pour la simulation… (more)

▼

Des atomes individuels piégés dans des matrices de pinces optiques et excités vers des états de Rydberg forment une plateforme expérimentale performante pour la simulation quantique de problèmes à N corps, comme le confirment les récents progrès dans le domaine. Lors de cette thèse, nous avons d’abord montré la production de matrices de pinces optiques, toutes chargées par des atomes uniques dans leur état fondamental. Notre technique de piégeage a été étendue au cas des atomes de Rydberg. Ces derniers sont chassés des zones de haute intensité par la force pondéromotrice. Par conséquent, nous avons créé par holographie des zones sombres entourés de lumière, pour les confiner. Nous avons aussi étudié les corrélations entre spins dans le cas des Hamiltoniens d’Ising ou XY, en utilisant le régime d’interaction de van der Waals ou dipolaire résonnant. Lors de notre étude du modèle d’Ising, nous avons observé l’apparition de corrélations antiferromagnétiques au cours d’une variation temporelle de l’Hamiltonien, mettant en évidence une vitesse effective pour la propagation des corrélations, ainsi qu’un mécanisme caractéristique de croissance site-à-site. Pour le modèle XY, nous avons montré la préparation d’un nombre contrôlé d’excitations de spin, ainsi que la production de chaînes ferromagnétiques, ou d’un ensemble de chaînes ferromagnétiques anti-alignées deux à deux. Enfin, nous avons utilisé d’autres termes d’échange, présents dans l’interaction dipolaire, pour créer des amplitudes de saut complexe pour une particule effective. Cette utilisation a conduit à l’apparition d’un champ de jauge artificiel, dont l’effet a été mesuré sur un système minimal composé de trois atomes, et ouvre la voie à l’observation d’états de bords chiraux, caractéristiques des isolants topologiques.

Rydberg-based platforms, involving single atoms trapped in arrays of optical tweezers and excited to Rydberg states, have recently proven attractive to perform quantum simulation of many-body physics. In this thesis, we first demonstrated the generation of arrays of optical tweezers fully loaded by single ground-state atoms. The trapping technique was then extended for Rydberg atoms. The latest are repelled from high-intensity regions via the ponderomotive force, so we created holographically dark regions surrounded by light to confine them. We also studied spin-spin correlations in artificial Ising or XY magnets, engineered by using either the van der Waals or the resonant dipolar coupling between Rydberg atoms. In the Ising case, we observed the growth of antiferromagnetic correlations during a dynamical tuning of the Hamiltonian, revealing an effective velocity for the spreading of correlations, and a typical site to site build-up mechanism. In the XY case, we demonstrated the preparation of a controlled number of spin excitations, and the generation of 1D XY ferromagnets and a 2D stripy order phase (ferromagnetic chains anti-aligned with respect to each other). Finally, we used additional exchange terms of the dipole-dipole interaction to…

Advisors/Committee Members: Lahaye, Thierry (thesis director).

Subjects/Keywords: Pinces optiques; Atomes individuels; Interaction dipolaire; Modèles de spins; Matière topologique; Simulation quantique; Optical tweezers; Single atoms; Dipole-Dipole interaction; Spin models; Topological matter; Quantum simulation

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lienhard, V. (2019). Physique quantique expérimentale à N corps dans des matrices d'atomes de Rydberg. Des modèles de spins à la matière topologique. : Experimental quantum many-body physics with arrays of Rydberg atoms. From spin models to topological matter. (Doctoral Dissertation). Université Paris-Saclay (ComUE). Retrieved from http://www.theses.fr/2019SACLO022

Chicago Manual of Style (16^th Edition):

Lienhard, Vincent. “Physique quantique expérimentale à N corps dans des matrices d'atomes de Rydberg. Des modèles de spins à la matière topologique. : Experimental quantum many-body physics with arrays of Rydberg atoms. From spin models to topological matter.” 2019. Doctoral Dissertation, Université Paris-Saclay (ComUE). Accessed January 18, 2021. http://www.theses.fr/2019SACLO022.

MLA Handbook (7^th Edition):

Lienhard, Vincent. “Physique quantique expérimentale à N corps dans des matrices d'atomes de Rydberg. Des modèles de spins à la matière topologique. : Experimental quantum many-body physics with arrays of Rydberg atoms. From spin models to topological matter.” 2019. Web. 18 Jan 2021.

Vancouver:

Lienhard V. Physique quantique expérimentale à N corps dans des matrices d'atomes de Rydberg. Des modèles de spins à la matière topologique. : Experimental quantum many-body physics with arrays of Rydberg atoms. From spin models to topological matter. [Internet] [Doctoral dissertation]. Université Paris-Saclay (ComUE); 2019. [cited 2021 Jan 18]. Available from: http://www.theses.fr/2019SACLO022.

Council of Science Editors:

Lienhard V. Physique quantique expérimentale à N corps dans des matrices d'atomes de Rydberg. Des modèles de spins à la matière topologique. : Experimental quantum many-body physics with arrays of Rydberg atoms. From spin models to topological matter. [Doctoral Dissertation]. Université Paris-Saclay (ComUE); 2019. Available from: http://www.theses.fr/2019SACLO022

16. Beguin, Lucas. Mesure de l’interaction de van der Waals entre deux atomes de Rydberg : Measurement of the van der Waals interaction between two Rydberg atoms.

Degree: Docteur es, Physique, 2013, Palaiseau, Institut d'optique théorique et appliquée

URL: http://www.theses.fr/2013IOTA0004

►

Les atomes neutres sont des candidats prometteurs pour la réalisation et l’étude d’états intriqués à quelques dizaines de particules. Pour générer de tels états, une… (more)

▼

Les atomes neutres sont des candidats prometteurs pour la réalisation et l’étude d’états intriqués à quelques dizaines de particules. Pour générer de tels états, une approche consiste à utiliser le mécanisme de blocage dipolaire résultant des fortes interactions dipôle-dipôle entre atomes de Rydberg.Suivant cette approche, cette thèse présente la conception et la caractérisation d’un dispositif expérimental permettant de manipuler des atomes de 87Rb individuels piégés dans des pinces op- tiques microscopiques, et à les exciter vers des états de Rydberg. Un environnement électrostatique stable et des électrodes de contrôle permettent une manipulation fine de ces états. Avec deux pinces optiques séparées de quelques microns, nous démontrons le blocage de Rydberg entre deux atomes, et nous observons leur excitation collective.Enfin, en opérant en régime de blocage partiel, nous développons une méthode permettant de mesurer l’interaction de van der Waals ∆E = C6 /R6 entre deux atomes séparés par une distance R contrôlée. Les coefficients C6 obtenus pour différents états de Rydberg sont en bon accord avec des calculs théoriques ab initio, et nous observons l’augmentation spectaculaire de l’interaction en fonction du nombre quantique principal n de l’état de Rydberg.

Neutral atoms are promising candidates for the realization of entangled states involving up to a few tens of particles. To generate such states, one approach consists in using the dipole blockade mechanism, which results from the strong dipole-dipole interactions between Rydberg atoms.Following this approach, this thesis describes the design and the characterization of an experimental apparatus allowing to manipulate single 87Rb atoms trapped in microscopic optical tweezers, and to excite them towards Rydberg states. A stable electrostatic environment and controlled electrodes enable the fine manipulation of these states. Using two optical tweezers separated by a few microns, we demonstrate the Rydberg blockade between two single atoms, and we observe their collective excitation.Finally, by operating in the partial blockade regime, we develop a method allowing to measure the van der Waals interaction ∆E = C6 /R6 between two atoms separated by a controlled distance R. The C6 coefficients obtained for various Rydberg states agree well with ab initio theoretical calculations, and we observe the dramatic increase of the interaction with the principal quantum number n of the Rydberg state.

Advisors/Committee Members: Browaeys, Antoine (thesis director).

Subjects/Keywords: Simulation quantique; Atome unique; Pinces optiques; Atomesde Rydberg; Interaction dipôle-dipôle; Interaction de van der Waals; Blocage de Rydberg; Intrication; Quantum simulation; Single atoms; Optical tweezers; Rydberg atoms; Dipole-dipole interaction; Van der Waals interaction; Rydberg block- ade; Entanglement; 530.12

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Beguin, L. (2013). Mesure de l’interaction de van der Waals entre deux atomes de Rydberg : Measurement of the van der Waals interaction between two Rydberg atoms. (Doctoral Dissertation). Palaiseau, Institut d'optique théorique et appliquée. Retrieved from http://www.theses.fr/2013IOTA0004

Chicago Manual of Style (16^th Edition):

Beguin, Lucas. “Mesure de l’interaction de van der Waals entre deux atomes de Rydberg : Measurement of the van der Waals interaction between two Rydberg atoms.” 2013. Doctoral Dissertation, Palaiseau, Institut d'optique théorique et appliquée. Accessed January 18, 2021. http://www.theses.fr/2013IOTA0004.

MLA Handbook (7^th Edition):

Beguin, Lucas. “Mesure de l’interaction de van der Waals entre deux atomes de Rydberg : Measurement of the van der Waals interaction between two Rydberg atoms.” 2013. Web. 18 Jan 2021.

Vancouver:

Beguin L. Mesure de l’interaction de van der Waals entre deux atomes de Rydberg : Measurement of the van der Waals interaction between two Rydberg atoms. [Internet] [Doctoral dissertation]. Palaiseau, Institut d'optique théorique et appliquée; 2013. [cited 2021 Jan 18]. Available from: http://www.theses.fr/2013IOTA0004.

Council of Science Editors:

Beguin L. Mesure de l’interaction de van der Waals entre deux atomes de Rydberg : Measurement of the van der Waals interaction between two Rydberg atoms. [Doctoral Dissertation]. Palaiseau, Institut d'optique théorique et appliquée; 2013. Available from: http://www.theses.fr/2013IOTA0004

University of Otago

17. Fung, Yin Hsien. Near-deterministic preparation of single atoms and Raman sideband cooling .

Degree: University of Otago

URL: http://hdl.handle.net/10523/7017

► In this thesis, we present our methods and results towards the development of deterministic preparation of single neutral atoms with a known quantum state in… (more)

Subjects/Keywords: atomic physics; laser cooling; single atoms; optical tweezer; light-assisted collisions; quantum metrology; ground state

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APA (6^th Edition):

Fung, Y. H. (n.d.). Near-deterministic preparation of single atoms and Raman sideband cooling . (Doctoral Dissertation). University of Otago. Retrieved from http://hdl.handle.net/10523/7017

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Chicago Manual of Style (16^th Edition):

Fung, Yin Hsien. “Near-deterministic preparation of single atoms and Raman sideband cooling .” Doctoral Dissertation, University of Otago. Accessed January 18, 2021. http://hdl.handle.net/10523/7017.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

MLA Handbook (7^th Edition):

Fung, Yin Hsien. “Near-deterministic preparation of single atoms and Raman sideband cooling .” Web. 18 Jan 2021.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Vancouver:

Fung YH. Near-deterministic preparation of single atoms and Raman sideband cooling . [Internet] [Doctoral dissertation]. University of Otago; [cited 2021 Jan 18]. Available from: http://hdl.handle.net/10523/7017.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Council of Science Editors:

Fung YH. Near-deterministic preparation of single atoms and Raman sideband cooling . [Doctoral Dissertation]. University of Otago; Available from: http://hdl.handle.net/10523/7017

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Université Paris-Sud – Paris XI

18. Fuhrmanek, Andreas. From single to many atoms in a microscopic optical dipole trap : De un à plusieurs atomes dans un micro piège dipolaire optique.

Degree: Docteur es, Physique, 2011, Université Paris-Sud – Paris XI

URL: http://www.theses.fr/2011PA112141

►

Cette thèse traite de la manipulation d'atomes de rubidium 87 piégés dans un piège optique dipolaire microscopique. Les expériences sont réalisées dans divers régimes de… (more)

▼

Cette thèse traite de la manipulation d'atomes de rubidium 87 piégés dans un piège optique dipolaire microscopique. Les expériences sont réalisées dans divers régimes de chargement du piège allant d'un atome unique à quelques milliers d'atomes en moyenne.Le régime à un seul atome permet de calibrer le dispositif expérimental. Nous utilisons l'atome unique comme bit quantique dont nous pouvons préparer et lire l'état avec une efficacité de 99.97% et 98.6%, respectivement. Lorsque plusieurs atomes sont chargés dans le piège microscopique, nous observons une distribution sub-Poissonienne du nombre d'atomes, liée aux collisions assistées par la présence de lumière quasi résonante. Une étude de ces collisions dans notre cas particulier (piège microscopique) révèle des taux de pertes extrêmement élevés, proches de la limite théorique de Langevin. Enfin, nous montrons que le chargement du piège microscopique avec plusieurs atomes est plus efficace lorsque nous superposons sur ce piège un deuxième piège, macroscopique, qui joue le rôle de réservoir d'atomes. Ce réservoir permet de charger le micro-piège à partir du macro-piège en l'absence de lumière quasi résonante et donc d'éviter les collisions assistées par la lumière.Le chargement du micro-piège à partir du macro-piège conduit à des conditions initiales optimales pour l'évaporation forcée dans la perspective d'atteindre la condensation de Bose-Einstein avec seulement une dizaine d'atomes. Après évaporation du gaz nous atteignons des densités dans l'espace des phases proches du régime de dégénérescence.

This thesis focuses on the manipulation of rubidium 87 atoms in a microscopic optical dipole trap. The experiments are performed in various regimes where the number of atoms in the microscopic trap ranges from exactly one atom to several thousands on average.The single atom regime allows us to calibrate the experimental setup. We use it a quantum bit, which state we can prepare and read out with efficiencies of 99.97% and 98.6%, respectively. When several atoms are loaded in the microscopic trap we observe a sub-Poissonian distribution of the number of atoms due to light-assisted collisions in the presence of near-resonant light. A study of these collisions in our particular case (microscopic trap) reveals extremely high loss rates approaching the theoretical Langevin limit. Finally, we demonstrate that the loading of the microscopic trap is more efficient when we superimpose on this trap a second macroscopic trap, which we use as an atom reservoir. This reservoir allows us to load the micro trap from the macro trap in the absence of any near-resonant light, thus avoiding light-assisted collisions.The loading of the micro trap from the macro trap leads to optimal initial conditions for forced evaporation towards Bose-Einstein condensation with about ten atoms only. After evaporation we reach phase-space densities approaching the degenerate regime.

Advisors/Committee Members: Browaeys, Antoine (thesis director).

Subjects/Keywords: Physique atomique; Information quantique; Atomes uniques; Systèmes mésoscopiques; Pinces optiques; Condensation de Bose-Einstein; Collisions assistées par la lumière; Piège dipolaire; Atomic physics; Quantum information; Single atoms; Mesoscopic systems; Optical tweezers; Bose-Einstein condensation; Light-assisted collisions; Dipole trap

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APA (6^th Edition):

Fuhrmanek, A. (2011). From single to many atoms in a microscopic optical dipole trap : De un à plusieurs atomes dans un micro piège dipolaire optique. (Doctoral Dissertation). Université Paris-Sud – Paris XI. Retrieved from http://www.theses.fr/2011PA112141

Chicago Manual of Style (16^th Edition):

Fuhrmanek, Andreas. “From single to many atoms in a microscopic optical dipole trap : De un à plusieurs atomes dans un micro piège dipolaire optique.” 2011. Doctoral Dissertation, Université Paris-Sud – Paris XI. Accessed January 18, 2021. http://www.theses.fr/2011PA112141.

MLA Handbook (7^th Edition):

Fuhrmanek, Andreas. “From single to many atoms in a microscopic optical dipole trap : De un à plusieurs atomes dans un micro piège dipolaire optique.” 2011. Web. 18 Jan 2021.

Vancouver:

Fuhrmanek A. From single to many atoms in a microscopic optical dipole trap : De un à plusieurs atomes dans un micro piège dipolaire optique. [Internet] [Doctoral dissertation]. Université Paris-Sud – Paris XI; 2011. [cited 2021 Jan 18]. Available from: http://www.theses.fr/2011PA112141.

Council of Science Editors:

Fuhrmanek A. From single to many atoms in a microscopic optical dipole trap : De un à plusieurs atomes dans un micro piège dipolaire optique. [Doctoral Dissertation]. Université Paris-Sud – Paris XI; 2011. Available from: http://www.theses.fr/2011PA112141

19. Bimbard, Erwan. Production and interaction of photons using atomic polaritons and Rydberg interactions : Production et interaction de photons en utilisant des polaritons atomiques et des interactions de Rydberg.

Degree: Docteur es, Physique, 2014, Palaiseau, Institut d'optique théorique et appliquée

URL: http://www.theses.fr/2014IOTA0015

►

Produire et faire interagir entre eux des photons optiques de façon contrôlée sont deux conditions nécessaires au développement de communications quantiques à longue distance, et… (more)

▼

Produire et faire interagir entre eux des photons optiques de façon contrôlée sont deux conditions nécessaires au développement de communications quantiques à longue distance, et plus généralement au traitement quantique d’information codée sur des photons. Cette thèse présente une étude expérimentale de solutions possibles a ces deux problèmes, en utilisant la conversion des photons en excitations collectives (polaritons) dans un nuage d’atomes froids, placé dans le mode d’une cavité optique de faible finesse (~100). Dans un premier temps, des polaritons entre états atomiques fondamentaux sont utilisés pour « mettre en mémoire » une excitation unique dans le nuage. Celle-ci est ensuite convertie efficacement en un photon unique, dont le champ est analysé par tomographie homodyne. La fonction de Wigner de l’état à un photon est reconstruite a partir des données expérimentales, et présente des valeurs négatives, démontrant que les degrés de liberté de ce photon (mode spatio-temporel et état quantique) sont complètement contrôlés. Dans un second temps, les photons sont couplés à des polaritons impliquant des états de Rydberg. Les fortes interactions dipolaires entre ces derniers se traduisent par des non-linéarités optiques dispersives très importantes, qui sont caractérisées dans un régime d’excitation classique. Ces non-linéarités peuvent être amplifiées jusqu’à ce qu’un seul photon suffise à modifier totalement la réponse du système, permettant en principe de générer des interactions effectives entre photons.

Controllably producing optical photons and making them interact are two key requirements for the development of long-distance quantum communications, and more generally for photonic quantum information processing. This thesis presents experimental studies on possible solutions to these two problems, using the conversion of the photons into collective excitations (polaritons) in a cold atomic cloud, inside the mode of a low-finesse optical cavity (~100). Firstly, ground-state polaritons are used to store a single excitation in the cloud memory. This polariton is then efficiently converted into a single photon, whose field is characterized via homodyne tomography. The single photon state’s Wigner function is reconstructed from the experimental data and exhibits negative values, demonstrating that the photon’s degrees of freedom (spatio-temporal mode and quantum state) are well controlled. Secondly, photons can be coupled to polaritons involving Rydberg states. The strong dipolar interactions between these give rise to very strong optical dispersive nonlinearities, that are characterized in a classical excitation regime. These nonlinearities can be amplified until a single photon is enough to modify the entire system’s response, allowing in principle for the generation of effective photon-photon interactions.

Advisors/Committee Members: Grangier, Philippe (thesis director).

Subjects/Keywords: Optique quantique; Photons uniques; États non gaussiens; Non-linéarité optique géante; Ensembles atomiques; Polaritons; Atomes de Rydberg; Tomographie homodyne; Quantum optics; Single photons; Non-gaussian states; Few-photon optical nonlinearity; Atomic ensembles; Polaritons; Rydberg atoms; Homodyne tomography; 535; 530.12; 539.721 7

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APA (6^th Edition):

Bimbard, E. (2014). Production and interaction of photons using atomic polaritons and Rydberg interactions : Production et interaction de photons en utilisant des polaritons atomiques et des interactions de Rydberg. (Doctoral Dissertation). Palaiseau, Institut d'optique théorique et appliquée. Retrieved from http://www.theses.fr/2014IOTA0015

Chicago Manual of Style (16^th Edition):

Bimbard, Erwan. “Production and interaction of photons using atomic polaritons and Rydberg interactions : Production et interaction de photons en utilisant des polaritons atomiques et des interactions de Rydberg.” 2014. Doctoral Dissertation, Palaiseau, Institut d'optique théorique et appliquée. Accessed January 18, 2021. http://www.theses.fr/2014IOTA0015.

MLA Handbook (7^th Edition):

Bimbard, Erwan. “Production and interaction of photons using atomic polaritons and Rydberg interactions : Production et interaction de photons en utilisant des polaritons atomiques et des interactions de Rydberg.” 2014. Web. 18 Jan 2021.

Vancouver:

Bimbard E. Production and interaction of photons using atomic polaritons and Rydberg interactions : Production et interaction de photons en utilisant des polaritons atomiques et des interactions de Rydberg. [Internet] [Doctoral dissertation]. Palaiseau, Institut d'optique théorique et appliquée; 2014. [cited 2021 Jan 18]. Available from: http://www.theses.fr/2014IOTA0015.

Council of Science Editors:

Bimbard E. Production and interaction of photons using atomic polaritons and Rydberg interactions : Production et interaction de photons en utilisant des polaritons atomiques et des interactions de Rydberg. [Doctoral Dissertation]. Palaiseau, Institut d'optique théorique et appliquée; 2014. Available from: http://www.theses.fr/2014IOTA0015

University of Oxford

20. Michelberger, Patrick Steffen. Room temperature caesium quantum memory for quantum information applications.

Degree: PhD, 2015, University of Oxford

URL: https://ora.ox.ac.uk/objects/uuid:19c9421d-0276-4c6d-a641-7640d2981da3 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.730504

► Quantum memories are key components in photonics-based quantum information processing networks. Their ability to store and retrieve information on demand makes repeat-until-success strategies scalable. Warm… (more)

▼ Quantum memories are key components in photonics-based quantum information processing networks. Their ability to store and retrieve information on demand makes repeat-until-success strategies scalable. Warm alkali-metal vapours are interesting candidates for the implementation of such memories, thanks to their very long storage times as well as their experimental simplicity and versatility. Operation with the Raman memory protocol enables high time-bandwidth products, which denote the number of possible storage trials within the memory lifetime. Since large time-bandwidth products enable multiple synchronisation trials of probabilistically operating quantum gates via memory-based temporal multiplexing, the Raman memory is a promising tool for such tasks. Particularly, the broad spectral bandwidth allows for direct and technologically simple interfacing with other photonic primitives, such as heralded single photon sources. Here, this kind of light-matter interface is implemented using a warm caesium vapour Raman memory. Firstly, we study the storage of polarisation-encoded quantum information, a common standard in quantum information processing. High quality polarisation preservation for bright coherent state input signals can be achieved, when operating the Raman memory in a dual-rail configuration inside a polarisation interferometer. Secondly, heralded single photons are stored in the memory. To this end, the memory is operated on-demand by feed-forward of source heralding events, which constitutes a key technological capability for applications in temporal multiplexing. Prior to storage, single photons are produced in a waveguide-based spontaneous parametric down conversion source, whose bespoke design spectrally tailors the heralded photons to the memory acceptance bandwidth. The faithful retrieval of stored single photons is found to be currently limited by noise in the memory, with a signal-to-noise ratio of approximately 0.3 in the memory output. Nevertheless, a clear influence of the quantum nature of an input photon is observed in the retrieved light by measuring the read-out signal's photon statistics via the g⁽²⁾-autocorrelation function. Here, we find a drop in g⁽²⁾ by more than three standard deviations, from g⁽²⁾ ~ 1.69 to g⁽²⁾ ~ 1.59 upon changing the input signal from coherent states to heralded single photons. Finally, the memory noise processes and their scalings with the experimental parameters are examined in detail. Four-wave-mixing noise is determined as the sole important noise source for the Raman memory. These experimental results and their theoretical description point towards practical solutions for noise-free operation.

Subjects/Keywords: 530.12; Physics; Laser Physics; Quantum Optics; Nonlinear Optics; Atomic Physics; Nonlinear optics; Quantum memory; Quantum information; Caesium; Quantum optics; Raman transitions; Quantum process tomography; Pulsed lasers; Atomic vapour; Spontaneous parameteric down-conversion; Quantum computing; Single photons; Alkali atoms; Four wave mixing

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APA (6^th Edition):

Michelberger, P. S. (2015). Room temperature caesium quantum memory for quantum information applications. (Doctoral Dissertation). University of Oxford. Retrieved from https://ora.ox.ac.uk/objects/uuid:19c9421d-0276-4c6d-a641-7640d2981da3 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.730504

Chicago Manual of Style (16^th Edition):

Michelberger, Patrick Steffen. “Room temperature caesium quantum memory for quantum information applications.” 2015. Doctoral Dissertation, University of Oxford. Accessed January 18, 2021. https://ora.ox.ac.uk/objects/uuid:19c9421d-0276-4c6d-a641-7640d2981da3 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.730504.

MLA Handbook (7^th Edition):

Michelberger, Patrick Steffen. “Room temperature caesium quantum memory for quantum information applications.” 2015. Web. 18 Jan 2021.

Vancouver:

Michelberger PS. Room temperature caesium quantum memory for quantum information applications. [Internet] [Doctoral dissertation]. University of Oxford; 2015. [cited 2021 Jan 18]. Available from: https://ora.ox.ac.uk/objects/uuid:19c9421d-0276-4c6d-a641-7640d2981da3 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.730504.

Council of Science Editors:

Michelberger PS. Room temperature caesium quantum memory for quantum information applications. [Doctoral Dissertation]. University of Oxford; 2015. Available from: https://ora.ox.ac.uk/objects/uuid:19c9421d-0276-4c6d-a641-7640d2981da3 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.730504

University of Florida

21. Duncan, Andrew John, 1965-. Site occupation and mechanical properties of iron-doped NiAl.

Degree: 1995, University of Florida

URL: https://ufdc.ufl.edu/AA00020031

Subjects/Keywords: Alloying; Alloys; Aluminum; Atoms; Conceptual lattices; Ductility; Iron alloys; Mechanical properties; Nickel; Single crystals

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APA (6^th Edition):

Duncan, Andrew John, 1. (1995). Site occupation and mechanical properties of iron-doped NiAl. (Thesis). University of Florida. Retrieved from https://ufdc.ufl.edu/AA00020031

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Duncan, Andrew John, 1965-. “Site occupation and mechanical properties of iron-doped NiAl.” 1995. Thesis, University of Florida. Accessed January 18, 2021. https://ufdc.ufl.edu/AA00020031.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Duncan, Andrew John, 1965-. “Site occupation and mechanical properties of iron-doped NiAl.” 1995. Web. 18 Jan 2021.

Vancouver:

Duncan, Andrew John 1. Site occupation and mechanical properties of iron-doped NiAl. [Internet] [Thesis]. University of Florida; 1995. [cited 2021 Jan 18]. Available from: https://ufdc.ufl.edu/AA00020031.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Duncan, Andrew John 1. Site occupation and mechanical properties of iron-doped NiAl. [Thesis]. University of Florida; 1995. Available from: https://ufdc.ufl.edu/AA00020031

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Florida

22. Wang, Shikai. Molecular Dynamics Study of Thermal Conductivity of Bismuth Telluride.

Degree: MS, Mechanical Engineering - Mechanical and Aerospace Engineering, 2013, University of Florida

URL: https://ufdc.ufl.edu/UFE0045623

► Bismuth telluride (Bi2Te3) is one of the best thermoelectric materials at room temperature. Since the crystal structure of Bi2Te3 is very complicated and hard to… (more)

Subjects/Keywords: Atoms; Conceptual lattices; Crystals; Grain boundaries; Heat flux; Modeling; Simulations; Temperature distribution; Temperature gradients; Thermal conductivity; bicrystal – bismuth – boundary – conductance – conductivity – crystal – direct – dynamics – grain – kapitza – md – method – molecular – resistance – single – telluride – thermal – twin

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APA (6^th Edition):

Wang, S. (2013). Molecular Dynamics Study of Thermal Conductivity of Bismuth Telluride. (Masters Thesis). University of Florida. Retrieved from https://ufdc.ufl.edu/UFE0045623

Chicago Manual of Style (16^th Edition):

Wang, Shikai. “Molecular Dynamics Study of Thermal Conductivity of Bismuth Telluride.” 2013. Masters Thesis, University of Florida. Accessed January 18, 2021. https://ufdc.ufl.edu/UFE0045623.

MLA Handbook (7^th Edition):

Wang, Shikai. “Molecular Dynamics Study of Thermal Conductivity of Bismuth Telluride.” 2013. Web. 18 Jan 2021.

Vancouver:

Wang S. Molecular Dynamics Study of Thermal Conductivity of Bismuth Telluride. [Internet] [Masters thesis]. University of Florida; 2013. [cited 2021 Jan 18]. Available from: https://ufdc.ufl.edu/UFE0045623.

Council of Science Editors:

Wang S. Molecular Dynamics Study of Thermal Conductivity of Bismuth Telluride. [Masters Thesis]. University of Florida; 2013. Available from: https://ufdc.ufl.edu/UFE0045623

University of Florida

23. Hickey, Diane Patricia. Ion Implantation Induced Defect Formation and Amorphization in the Group IV Semiconductors Diamond, Silicon, and Germanium.

Degree: PhD, Materials Science and Engineering, 2007, University of Florida

URL: https://ufdc.ufl.edu/UFE0021224

► Silicon, which has been the workhorse of the semiconductor industry for the past several decades, is now being enhanced with other Group IV elements, such… (more)

Subjects/Keywords: Annealing; Atoms; Carbon; Crystals; Dosage; Electrons; Graphite; Imaging; Ions; Yield point; crystal, diamond, germanium, implantation, implants, ion, semiconductor, silicon, single

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APA (6^th Edition):

Hickey, D. P. (2007). Ion Implantation Induced Defect Formation and Amorphization in the Group IV Semiconductors Diamond, Silicon, and Germanium. (Doctoral Dissertation). University of Florida. Retrieved from https://ufdc.ufl.edu/UFE0021224

Chicago Manual of Style (16^th Edition):

Hickey, Diane Patricia. “Ion Implantation Induced Defect Formation and Amorphization in the Group IV Semiconductors Diamond, Silicon, and Germanium.” 2007. Doctoral Dissertation, University of Florida. Accessed January 18, 2021. https://ufdc.ufl.edu/UFE0021224.

MLA Handbook (7^th Edition):

Hickey, Diane Patricia. “Ion Implantation Induced Defect Formation and Amorphization in the Group IV Semiconductors Diamond, Silicon, and Germanium.” 2007. Web. 18 Jan 2021.

Vancouver:

Hickey DP. Ion Implantation Induced Defect Formation and Amorphization in the Group IV Semiconductors Diamond, Silicon, and Germanium. [Internet] [Doctoral dissertation]. University of Florida; 2007. [cited 2021 Jan 18]. Available from: https://ufdc.ufl.edu/UFE0021224.

Council of Science Editors:

Hickey DP. Ion Implantation Induced Defect Formation and Amorphization in the Group IV Semiconductors Diamond, Silicon, and Germanium. [Doctoral Dissertation]. University of Florida; 2007. Available from: https://ufdc.ufl.edu/UFE0021224

University of Florida

24. Weaver, Mark Lovell, 1965-. Investigation of strain aging in the ordered intermetallic compound B-NiAl.

Degree: PhD, Materials Science and Engineering, 1995, University of Florida

URL: https://ufdc.ufl.edu/AA00009042

Subjects/Keywords: Alloys; Annealing; Atoms; Intermetallics; Precipitation hardening; Single crystals; Solutes; Strain rate; Temperature dependence; Yield point

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APA (6^th Edition):

Weaver, Mark Lovell, 1. (1995). Investigation of strain aging in the ordered intermetallic compound B-NiAl. (Doctoral Dissertation). University of Florida. Retrieved from https://ufdc.ufl.edu/AA00009042

Chicago Manual of Style (16^th Edition):

Weaver, Mark Lovell, 1965-. “Investigation of strain aging in the ordered intermetallic compound B-NiAl.” 1995. Doctoral Dissertation, University of Florida. Accessed January 18, 2021. https://ufdc.ufl.edu/AA00009042.

MLA Handbook (7^th Edition):

Weaver, Mark Lovell, 1965-. “Investigation of strain aging in the ordered intermetallic compound B-NiAl.” 1995. Web. 18 Jan 2021.

Vancouver:

Weaver, Mark Lovell 1. Investigation of strain aging in the ordered intermetallic compound B-NiAl. [Internet] [Doctoral dissertation]. University of Florida; 1995. [cited 2021 Jan 18]. Available from: https://ufdc.ufl.edu/AA00009042.

Council of Science Editors:

Weaver, Mark Lovell 1. Investigation of strain aging in the ordered intermetallic compound B-NiAl. [Doctoral Dissertation]. University of Florida; 1995. Available from: https://ufdc.ufl.edu/AA00009042

University of Florida

25. Tsai, Yueh-Long. Experimental and molecular dynamics determination of fractal fracture in single crystal silicon.

Degree: 1993, University of Florida

URL: https://ufdc.ufl.edu/AA00023274

Subjects/Keywords: Atoms; Fractal dimensions; Fractals; Geometric planes; Silicon; Simulations; Single crystals; Strain rate; Stress fractures; Toughness; Materials Science and Engineering thesis Ph.D

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Tsai, Y. (1993). Experimental and molecular dynamics determination of fractal fracture in single crystal silicon. (Thesis). University of Florida. Retrieved from https://ufdc.ufl.edu/AA00023274

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Tsai, Yueh-Long. “Experimental and molecular dynamics determination of fractal fracture in single crystal silicon.” 1993. Thesis, University of Florida. Accessed January 18, 2021. https://ufdc.ufl.edu/AA00023274.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Tsai, Yueh-Long. “Experimental and molecular dynamics determination of fractal fracture in single crystal silicon.” 1993. Web. 18 Jan 2021.

Vancouver:

Tsai Y. Experimental and molecular dynamics determination of fractal fracture in single crystal silicon. [Internet] [Thesis]. University of Florida; 1993. [cited 2021 Jan 18]. Available from: https://ufdc.ufl.edu/AA00023274.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Tsai Y. Experimental and molecular dynamics determination of fractal fracture in single crystal silicon. [Thesis]. University of Florida; 1993. Available from: https://ufdc.ufl.edu/AA00023274

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

26. Konstantinidis, Gregory-Orfeus. Diffractive dark-ground imaging of ultra-low atom-numbers in a MOT.

Degree: 2012, University of Crete (UOC); Πανεπιστήμιο Κρήτης

URL: http://hdl.handle.net/10442/hedi/28592

►

In this work, the theoretical principles of laser cooling and magneto-optical trapping are presented, and the magneto-optical trap (MOT) of the experiment is characterized for… (more)

▼

In this work, the theoretical principles of laser cooling and magneto-optical trapping are presented, and the magneto-optical trap (MOT) of the experiment is characterized for the loading and loss rates. By using uorescence imaging, single atom resolution is achieved in the MOT. The theory of di_ractive dark-ground imaging is presented, along technical considerations for the implementation of the technique. Imaging techniques of high sensitivity and resolution are vital to the study of the quantum phenomena inherent with cold atom ensembles and in the interactions between single particles. We implement di_ractive dark-ground imaging as a sensitive technique to detect small cold atomic samples at very low optical densities prepared in a MOT. The originally achieved single atom resolution in the MOT by uorescence imaging allows for the calibration of the atom number measured with uorescence imaging, which is used as a reference to the atom number measured with di_ractive dark-ground imaging. The di_ractive dark-ground technique is used to image free expanding atom clouds released from a MOT of atom numbers down to 100 and optical densities down to 0.01 at an exposure time of 100 _s. The same technique applied on a BEC setup has resulted in the detection of atom numbers down to 7 atoms at the same range of optical densities, and it displays an improvement to the signal to noise ratio of a factor of 10 compared to classical absorption imaging.

Στη παρούσα διατριβή παρουσιάζονται οι αρχές της οπτικής ψύξης και της μαγνητοοπτικής παγίδευσης, και γίνεται χαρακτηρισμός της μαγνητοοπτικής παγίδας (ΜΟΤ) για τους ρυθμούς επαύξησης και απωλιών αυτής. Με απεικόνιση φθορισμού επιτυγχάνεται ο εντοπισμός ενός ατόμου στην ΜΟΤ. Παρουσιάζεται η θεωρία για την περιθλαστική απεικόνιση σκοτεινού πεδίου μαζί με τεχνικούς προβληματισμούς για την υλοποίηση αυτής. Τεχνικές απεικόνισης υψηλής ευαισθησίας και ανάλυσης παρουσιάζουν μεγάλη χρησιμότητα στην μελέτη των κβαντικών φαινομένουν που εμφανίζονται στα σύνολα ατόμων χαμηλών θερμοκρασιών και στις αλληλεπιδράσεις μεμονομένων ατόμων. Υλοποιήσαμε την περιθλαστική απεικόνιση σκοτεινού πεδίου ως μία τεχνική υψηλής ευαισθησίας για τον εντοπισμό μικρού μεγέθους ατομικών συνόλων χαμηλών θερμοκρασιών σε πολύ χαμηλά οπτικά βάθη. Ο εντοπισμός ενός ατόμου, που έχει επιτευχθεί αρχικά στην ΜΟΤ με απεικόνιση φθορισμού, επιτρέπει την βαθμολόγηση της καταμέτρησης ατόμων με φθορισμό. Η απεικόνιση φθορισμού στη συνέχεια χρησιμοποιείται ως μέθοδος αναφοράς για την καταμέτρηση ατόμων με την περιθλαστική απεικόνιση σκοτεινού πεδίου. Χρησιμοποιούμε την περιθλαστική απεικόνιση σκοτεινού πεδίου για την απεικόνιση ελεύθερα διογκόμενων ατομικών νεφών που έχουν αποδεσμευτεί απο την ΜΟΤ με αριθμούς ατόμων έως 100 το ελάχιστο και οπτικά βάθη έως 0.01 το ελάχιστο σε χρόνους έκθεσης 100 μs. Εφαρμόζουμε την αυτή τεχνική σε διάταξη συμπύκνωσης Bose-Einstein (BEC), όπου και επιτυγχάνεται ο εντοπισμούς αριθμού ατόμων έως 7 το ελάχιστο με το ίδιο οπτικό βάθος, και παρατηρείται βελτίωση του σηματοθορυ

Subjects/Keywords: Περιθλαστική απεικόνιση; Απεικόνιση ψυχρού πεδίου; Απεικόνιση απορρόφησης; Απεικόνιση φθορισμού; Ψυχρά άτομα; Μαγνητοοπτική παγίδα; Μεμωνομένο άτομο; Χαμηλός αριθμός ατόμων; Diffractive imaging; Dark-ground imaging; Absorption imaging; Fluorescence imaging; Gold atoms; Magneto-optical Trap; Single atom; Low atom number

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Konstantinidis, G. (2012). Diffractive dark-ground imaging of ultra-low atom-numbers in a MOT. (Thesis). University of Crete (UOC); Πανεπιστήμιο Κρήτης. Retrieved from http://hdl.handle.net/10442/hedi/28592

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Konstantinidis, Gregory-Orfeus. “Diffractive dark-ground imaging of ultra-low atom-numbers in a MOT.” 2012. Thesis, University of Crete (UOC); Πανεπιστήμιο Κρήτης. Accessed January 18, 2021. http://hdl.handle.net/10442/hedi/28592.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Konstantinidis, Gregory-Orfeus. “Diffractive dark-ground imaging of ultra-low atom-numbers in a MOT.” 2012. Web. 18 Jan 2021.

Vancouver:

Konstantinidis G. Diffractive dark-ground imaging of ultra-low atom-numbers in a MOT. [Internet] [Thesis]. University of Crete (UOC); Πανεπιστήμιο Κρήτης; 2012. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/10442/hedi/28592.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Konstantinidis G. Diffractive dark-ground imaging of ultra-low atom-numbers in a MOT. [Thesis]. University of Crete (UOC); Πανεπιστήμιο Κρήτης; 2012. Available from: http://hdl.handle.net/10442/hedi/28592

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

27. Kim, Moochan. Problems on Non-Equilibrium Statistical Physics.

Degree: PhD, Physics, 2011, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-8007

► Four problems in non-equilibrium statistical physics are investigated: 1. The thermodynamics of single-photon gas; 2. Energy of the ground state in Multi-electron atoms; 3. Energy… (more)

▼ Four problems in non-equilibrium statistical physics are investigated: 1. The thermodynamics of single-photon gas; 2. Energy of the ground state in Multi-electron atoms; 3. Energy state of the H2 molecule; and 4. The Condensation behavior in N weakly interacting Boson gas. In the single-photon heat engine, we have derived the equation of state similar to that in classical ideal gas and applied it to construct the Carnot cycle with a single photon, and showed the Carnot efficiency in this single-photon heat engine. The energies of the ground state of multi-electron atoms are calculated using the modi ed Bohr model with a shell structure of the bound electrons. The di erential Schrodinger equation is simpli ed into the minimization problem of a simple energy functional, similar to the problem in dimensional scaling in the H-atom. For the C-atom, we got the ground state energy -37:82 eV with a relative error less than 6 %. The simplest molecular ion, H+ 2 , has been investigated by the quasi-classical method and two-center molecular orbit. Using the two-center molecular orbit derived from the exact treatment of the H+ 2 molecular ion problem, we can reduce the number of terms in wavefunction to get the binding energy of the H2 molecule, without using the conventional wavefunction with over-thousand terms. We get the binding energy for the H2 with Hylleraas correlation factor 1 + kr12 as 4:7eV, which is comparable to the experimental value of 4:74 eV. Condensation in the ground state of a weakly interacting Bose gas in equilibrium is investigated using a partial partition function in canonical ensemble. The recursive relation for the partition function developed for an ideal gas has been modi ed to be applicable in the interacting case, and the statistics of the occupation number in condensate states was examined. The well-known behavior of the Bose-Einstein Condensate for a weakly interacting Bose Gas are shown: Depletion of the condensate state, even at zero temperature, and a maximum uctuation near transition temperature. Furthermore, the use of the partition function in canonical ensemble leads to the smooth cross-over between low temperatures and higher temperatures, which has enlarged the applicable range of the Bogoliubov transformation. During the calculation, we also developed the formula to calculate the correlations among the excited states. Advisors/Committee Members: Scully, Marlan (advisor), Fry, Edward (committee member), Kocharovskaya, Olga (committee member), Welch, George (committee member), Kish, Laszlo (committee member).

Subjects/Keywords: single photon heat engine; multi-electron atoms; modified Bohr model; two-center molecular orbit; Bose-Einstein Condenation; partial partition function

…single-photon heat engine, multi-electron atoms in dimensional scaling, binding energy in… …LIST OF TABLES TABLE Page I Processes in Carnot cycle with a single photon… …118 II Table for the shell structure of the multi-electron atoms . . . . . . . 119 III… …Table for the ground state energy of multi-electron atoms until Z = 25… …124 2 Diagram in P-V plane for the Carnot cycle with single-photon. . . . . 125 3…

10 more images…

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kim, M. (2011). Problems on Non-Equilibrium Statistical Physics. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-8007

Chicago Manual of Style (16^th Edition):

Kim, Moochan. “Problems on Non-Equilibrium Statistical Physics.” 2011. Doctoral Dissertation, Texas A&M University. Accessed January 18, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-8007.

MLA Handbook (7^th Edition):

Kim, Moochan. “Problems on Non-Equilibrium Statistical Physics.” 2011. Web. 18 Jan 2021.

Vancouver:

Kim M. Problems on Non-Equilibrium Statistical Physics. [Internet] [Doctoral dissertation]. Texas A&M University; 2011. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-8007.

Council of Science Editors:

Kim M. Problems on Non-Equilibrium Statistical Physics. [Doctoral Dissertation]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-8007

University of Florida

28. Xiong,Liming. A Concurrent Atomistic-Continuum Methodology and Its Applications.

Degree: PhD, Mechanical Engineering - Mechanical and Aerospace Engineering, 2011, University of Florida

URL: https://ufdc.ufl.edu/UFE0042371

The objective of my dissertation research is to develop a concurrent Advisors/Committee Members: Chen, Youping (committee chair), Sawyer, Wallace G (committee member), Sankar, Bhavani V (committee member), Phillpot, Simon R (committee member).

Subjects/Keywords: Atoms; Conceptual lattices; Continuum mechanics; Crystals; Deformation; Modeling; Silicon; Simulations; Single crystals; Stacking faults; atomistic – continuum – dislocation – fem – fracture – md – multiscale – nonequilibriuum – phonon – simulations – statistical – transport

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Xiong,Liming. (2011). A Concurrent Atomistic-Continuum Methodology and Its Applications. (Doctoral Dissertation). University of Florida. Retrieved from https://ufdc.ufl.edu/UFE0042371

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Chicago Manual of Style (16^th Edition):

Xiong,Liming. “A Concurrent Atomistic-Continuum Methodology and Its Applications.” 2011. Doctoral Dissertation, University of Florida. Accessed January 18, 2021. https://ufdc.ufl.edu/UFE0042371.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

MLA Handbook (7^th Edition):

Xiong,Liming. “A Concurrent Atomistic-Continuum Methodology and Its Applications.” 2011. Web. 18 Jan 2021.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Vancouver:

Xiong,Liming. A Concurrent Atomistic-Continuum Methodology and Its Applications. [Internet] [Doctoral dissertation]. University of Florida; 2011. [cited 2021 Jan 18]. Available from: https://ufdc.ufl.edu/UFE0042371.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Council of Science Editors:

Xiong,Liming. A Concurrent Atomistic-Continuum Methodology and Its Applications. [Doctoral Dissertation]. University of Florida; 2011. Available from: https://ufdc.ufl.edu/UFE0042371

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

University of Florida

29. Shumbera, Robert Bradley. Growth, Properties, and Reactivity of High-Concentration Oxygen Phases on Pt(100).

Degree: PhD, Chemical Engineering, 2008, University of Florida

URL: https://ufdc.ufl.edu/UFE0021960

► Pt oxidation is of fundamental scientific interest and is critically important to many applications of heterogeneous catalysis since the active surface of a Pt catalyst… (more)

▼ Pt oxidation is of fundamental scientific interest and is critically important to many applications of heterogeneous catalysis since the active surface of a Pt catalyst can be in a variety of oxygen-covered states under the operating conditions of typical catalytically relevant processes. Given that such oxygen phases can significantly affect catalyst performance, there is substantial motivation for pursuing a detailed understanding of Pt oxidation. As such, we utilized gas-phase atomic oxygen beams and surface analysis techniques in ultrahigh vacuum to investigate the growth, properties, and reactivity of high-concentration oxygen phases on the Pt(100) surface. We find that, for relatively low coverages, the types and relative populations of oxygen phases that develop are highly dependent on the surface temperature during adsorption. Indeed, a disordered oxygen state preferentially forms at 450 K, at the expense of a two-dimensional, surface oxide that forms at 575 K. Thus, the disordered state appears to be metastable relative to the two-dimensional oxide. For higher coverages, oxygen atoms apparently adsorb on top of the two-dimensional oxide and act as a precursor to forming bulk-like, three-dimensional oxide particles. We show that a model assuming these precursor oxygen atoms can either associatively desorb or react with the two-dimensional oxide to form a three-dimensional oxide particle quantitatively reproduces the measured kinetics governing the transition from two-dimensional to three-dimensional oxide growth. By examining the reactivity of the oxygen-covered Pt(100) surfaces toward the oxidation of CO, we find that the reaction is facile on oxygen phases that form below coverages of about one monolayer and inefficient when three-dimensional Pt oxide particles partially cover the surface. Our work shows that the intrinsic reactivity toward CO is highest for the two-dimensional oxide and lowest for the three-dimensional oxide. At higher temperatures, reaction also occurs on metallic regions of the surface covered with relatively low concentrations of chemisorbed oxygen atoms, while the morphology of the three-dimensional oxide strongly influences the kinetics. Our work supports the growing evidence that three-dimensional oxide on Pt surfaces is less reactive toward CO oxidation than the oxygen phases that form at intermediate coverages. ( en ) Advisors/Committee Members: Weaver, Jason F. (committee chair), Kopelevich, Dmitry I. (committee member), Hagelin-Weaver, Helena E. (committee member), Micha, David A. (committee member).

Subjects/Keywords: Adsorption; Atoms; Desorption; Kinetics; Metastable atoms; Oxidation; Oxides; Oxygen; Reactivity; Surface temperature; 100, atom, carbon, chemical, co, co2, crystal, desorption, engineering, interactions, kinetics, o, o2, oxidation, oxygen, platinum, programmed, pt, pt100, reaction, single, solid, spectroscopy, surface, surfaces, temperature, tpd, tprs, uhv, vacuum

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Shumbera, R. B. (2008). Growth, Properties, and Reactivity of High-Concentration Oxygen Phases on Pt(100). (Doctoral Dissertation). University of Florida. Retrieved from https://ufdc.ufl.edu/UFE0021960

Chicago Manual of Style (16^th Edition):

Shumbera, Robert Bradley. “Growth, Properties, and Reactivity of High-Concentration Oxygen Phases on Pt(100).” 2008. Doctoral Dissertation, University of Florida. Accessed January 18, 2021. https://ufdc.ufl.edu/UFE0021960.

MLA Handbook (7^th Edition):

Shumbera, Robert Bradley. “Growth, Properties, and Reactivity of High-Concentration Oxygen Phases on Pt(100).” 2008. Web. 18 Jan 2021.

Vancouver:

Shumbera RB. Growth, Properties, and Reactivity of High-Concentration Oxygen Phases on Pt(100). [Internet] [Doctoral dissertation]. University of Florida; 2008. [cited 2021 Jan 18]. Available from: https://ufdc.ufl.edu/UFE0021960.

Council of Science Editors:

Shumbera RB. Growth, Properties, and Reactivity of High-Concentration Oxygen Phases on Pt(100). [Doctoral Dissertation]. University of Florida; 2008. Available from: https://ufdc.ufl.edu/UFE0021960

Indian Institute of Science

30. Nayak, Malaya Kumar. Theoretical Investigation Of Relativistic Effects In Heavy Atoms And Polar Molecules.

Degree: PhD, Faculty of Science, 2009, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/441

► Extensive theoretical studies on the ground and excited state properties of systems containing heavy atoms have shown that accurate prediction of transition energies and related… (more)

▼ Extensive theoretical studies on the ground and excited state properties of systems containing heavy atoms have shown that accurate prediction of transition energies and related properties requires the incorporation of both relativistic and higher order correlation and relaxation effects as these effects are strongly inter- wined. The relativistic and dynamical electron correlation effects can be incor- porated in many-electron systems through a variety of many-body methods like configuration interaction (CI), coupled cluster method (CCM) etc. which are very powerful and effective tool for high precision description of electron correlation in many-electron systems. In this thesis, we investigate the relativistic and correlation effects in heavy atomic and molecular systems using these two highly correlated many-body methods. It is well recognized that, heavy polar diatomic molecules such as BaF, YbF, TlF, PbO, etc. are the leading experimental candidates for the search of violation of Parity (P ) and Time-reversal (T ) symmetry. The experimental detection of such P,T-odd effects in atoms and molecules has important consequences for the theory of fundamental interactions or for physics beyond the standard model (SM). For instance, a series of experiments on TlF have already been reported which provide the tightest limit available on the tensor coupling constant C , proton electric dipole moment (EDM) dp , etc. Experiments on YbF and BaF molecules are also of fundamental significance to the study of symmetry violation in nature, as these experiments have the potential to detect effects due to the electron EDMde. It is therefore imperative that high precession calculations are necessary to interpret these ongoing (and perhaps forthcoming) experimental outcome. For example, the knowledge of the effective electric field E(characterized by Wd) at the unpaired electron is required to link the experimentally determined P,T-odd frequency shift with the electron EDM de. We begin with a brief review of P,T-odd effects in heavy atoms and polar diatomics and the possible mechanisms which can give rise to such effects, in particular, the one arises due to the intrinsic electron EDM de. The P,T-odd interaction constant Wd is computed for the ground (2∑ ) state of YbF and BaF molecules using all-electron DF orbitals at the restricted active space (RAS) CI level. The RASCI space used for both systems in this calculation is sufficiently large to incorporate important core-core, core-valence, and valence-valence electron correlation effects. In addition to Wd, we also report the dipole moment (µe ) for these systems to assess the reliability of the method. The basis set dependency of Wd is also analyzed. The single reference coupled cluster (SRCC) method, developed by the cluster expansion of a single determinant reference function, is one of the most sophisticated method for treating dynamical correlation effects in a size-extensive manner. The non-uniqueness of the exponential nature of the wave operator diversifies the methods in… Advisors/Committee Members: Chaudhuri, Rajat K (advisor).

Subjects/Keywords: Heavy Atoms; Polar Molecules; Electron Correlation; Hydrogen Cyanide (HCN); Coupled Cluster Method (CCM); Configuration Interaction (CI); P,T-odd Interaction; YbF; BaF; TlF; PbO; Single Reference Coupled Cluster (SRCC); Atomic Physics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Nayak, M. K. (2009). Theoretical Investigation Of Relativistic Effects In Heavy Atoms And Polar Molecules. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/441

Chicago Manual of Style (16^th Edition):

Nayak, Malaya Kumar. “Theoretical Investigation Of Relativistic Effects In Heavy Atoms And Polar Molecules.” 2009. Doctoral Dissertation, Indian Institute of Science. Accessed January 18, 2021. http://etd.iisc.ac.in/handle/2005/441.

MLA Handbook (7^th Edition):

Nayak, Malaya Kumar. “Theoretical Investigation Of Relativistic Effects In Heavy Atoms And Polar Molecules.” 2009. Web. 18 Jan 2021.

Vancouver:

Nayak MK. Theoretical Investigation Of Relativistic Effects In Heavy Atoms And Polar Molecules. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2009. [cited 2021 Jan 18]. Available from: http://etd.iisc.ac.in/handle/2005/441.

Council of Science Editors:

Nayak MK. Theoretical Investigation Of Relativistic Effects In Heavy Atoms And Polar Molecules. [Doctoral Dissertation]. Indian Institute of Science; 2009. Available from: http://etd.iisc.ac.in/handle/2005/441

Open Access Theses and Dissertations