You searched for subject:(quantum entanglement).
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University of Miami
1.
Perez Veitia, Andrzej.
Local Entanglement Generation in Two-Qubit Systems.
Degree: PhD, Physics (Arts and Sciences), 2010, University of Miami
URL: https://scholarlyrepository.miami.edu/oa_dissertations/476 
► We study the entanglement of two-qubit systems resulting from local interactions with spatially extended bosonic systems. Our results apply to the case where the…
(more)
▼ We study the
entanglement of two-qubit systems resulting from local interactions with spatially extended bosonic systems. Our results apply to the case where the initial state of the bosonic system is represented by a statistical mixture of states with fixed particle number. In particular, we derive and discuss necessary conditions to generate
entanglement in the two-qubit system. We also study the scenario where the joint system is initially in its ground state and the interaction is switched on adiabatically. Using time independent perturbation theory and the adiabatic theorem, we show conditions under which the qubits become entangled as the joint system evolves into the ground state of the interacting theory
Advisors/Committee Members: Thomas Curtright, Luca Mezincescu, Josef Ashkenazi, Carolyne Van Vliet.
Subjects/Keywords: Quantum Entanglement
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APA (6th Edition):
Perez Veitia, A. (2010). Local Entanglement Generation in Two-Qubit Systems. (Doctoral Dissertation). University of Miami. Retrieved from https://scholarlyrepository.miami.edu/oa_dissertations/476
Chicago Manual of Style (16th Edition):
Perez Veitia, Andrzej. “Local Entanglement Generation in Two-Qubit Systems.” 2010. Doctoral Dissertation, University of Miami. Accessed February 27, 2021.
https://scholarlyrepository.miami.edu/oa_dissertations/476.
MLA Handbook (7th Edition):
Perez Veitia, Andrzej. “Local Entanglement Generation in Two-Qubit Systems.” 2010. Web. 27 Feb 2021.
Vancouver:
Perez Veitia A. Local Entanglement Generation in Two-Qubit Systems. [Internet] [Doctoral dissertation]. University of Miami; 2010. [cited 2021 Feb 27].
Available from: https://scholarlyrepository.miami.edu/oa_dissertations/476.
Council of Science Editors:
Perez Veitia A. Local Entanglement Generation in Two-Qubit Systems. [Doctoral Dissertation]. University of Miami; 2010. Available from: https://scholarlyrepository.miami.edu/oa_dissertations/476
University of Rochester
2.
Rafsanjani, Seyed Mohammad Hashemi.
Theory of multipartite entanglement for
X-states.
Degree: PhD, 2015, University of Rochester
URL: http://hdl.handle.net/1802/29273
► More than a century after the seminal work of Schmidt and with all the enthusiasm that have surrounded entanglement ever since the controversial EPR paper,…
(more)
▼ More than a century after the seminal work of
Schmidt and with all the enthusiasm that have surrounded
entanglement ever since the controversial EPR paper, it remains an
open challenge to determine whether a given state possesses
entanglement or not. The problem is even more difficult if one
considers the entanglement among more than two parties, i.e.
multipartite entanglement. In the following we first introduce the
concept of multipartite entanglement and discuss what it means to
quantify the
entanglement of a given state. We then introduce a
class of multiqubit states, called X-states, and find an algebraic
formula for the multipartite entanglement of such states. We show
that using this formula one can find a lower bound for the
entanglement of any multiqubit state. We then explore the
connection between the entanglement and purity in multiqubit
states. In the fourth chapter, we introduce a geometrical measure
of entanglement and quantify it for the set of GHZ-diagonal states.
These
are states that can be written as a convex sum of completely
bit-flipped states. Using these results we can develop an upper and
a lower bound for the entanglement of any density matrix. In the
final chapter we survey some of the insights that can be developed
using the results of the preceding chapters. We first explore the
decay of entanglement in a decoherence scenario where each qubit is
experiences decay through an amplitude damping channel, and finally
we make a proposal to preserve and control
multipartite
entanglement through the phenomenon of collapse and
revival.
Subjects/Keywords: Entanglement; Multipartite entanglement; Quantum optics
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APA (6th Edition):
Rafsanjani, S. M. H. (2015). Theory of multipartite entanglement for
X-states. (Doctoral Dissertation). University of Rochester. Retrieved from http://hdl.handle.net/1802/29273
Chicago Manual of Style (16th Edition):
Rafsanjani, Seyed Mohammad Hashemi. “Theory of multipartite entanglement for
X-states.” 2015. Doctoral Dissertation, University of Rochester. Accessed February 27, 2021.
http://hdl.handle.net/1802/29273.
MLA Handbook (7th Edition):
Rafsanjani, Seyed Mohammad Hashemi. “Theory of multipartite entanglement for
X-states.” 2015. Web. 27 Feb 2021.
Vancouver:
Rafsanjani SMH. Theory of multipartite entanglement for
X-states. [Internet] [Doctoral dissertation]. University of Rochester; 2015. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1802/29273.
Council of Science Editors:
Rafsanjani SMH. Theory of multipartite entanglement for
X-states. [Doctoral Dissertation]. University of Rochester; 2015. Available from: http://hdl.handle.net/1802/29273
University of New Mexico
3.
Riofrío, Almeida Carlos.
Continuous measurement quantum state tomography of atomic ensembles.
Degree: Physics & Astronomy, 2012, University of New Mexico
URL: http://hdl.handle.net/1928/17499
► Quantum state tomography is a fundamental tool in quantum information processing tasks. It allows us to estimate the state of a quantum system by measuring…
(more)
▼ Quantum state tomography is a fundamental tool in
quantum information processing tasks. It allows us to estimate the state of a
quantum system by measuring different observables on many identically prepared copies of the system. Usually, one makes projective measurements of an informationally complete set of observables and repeats them enough times so that good estimates of their expectation values are obtained. This is, in general, a very time-consuming task that requires a large number of measurements. There are, however, systems in which the data acquisition can be done more efficiently. In fact, an ensemble of
quantum systems can be prepared and manipulated by external fields while being continuously probed collectively, producing enough information to estimate its state. This provides a basis for continuous measurement
quantum tomography, and is the main topic of this dissertation. This method, based on weak continuous measurement, has the advantage of being fast, accurate, and almost nonperturbative. In this work, we present a extensive discussion and a generalization of the protocol proposed in [1], which was experimentally achieved in [2] using cold cesium atoms. In this protocol, an ensemble of identically prepared systems is collectively probed and controlled in a time-dependent manner so as to create an informationally complete continuous measurement record. The measurement history is then inverted to determine the state at the initial time. To achieve this, we use two different estimation methods: the widely used maximum likelihood and the novel compressed sensing algorithms. The general formalism is applied to the case of reconstruction of the
quantum state encoded in the magnetic sub-levels of a large-spin alkali atom, 133Cs. We extend the applicability of the protocol in [1] to the more ambitious case of reconstruction of states in the full 16-dimensional electronic-ground subspace (F = 3 \u2295 F = 4), controlled by microwaves and radio-frequency magnetic fields. We give detailed derivations of all physical interactions, approximations, numerical methods, and fitting procedures, tailored to the realistic experimental setting. In addition, we numerically study the reconstruction algorithms and determine their applicability and appropriate use. Moreover, in collaboration with the lab of Prof. P. Jessen at the University of Arizona, we present an experimental demonstration of continuous measurement
quantum tomography in an ensemble of cold cesium atoms with full control of its 16-dimensional Hilbert space. In this case, we show the exquisite level of control achieved in the lab and the excellent agreement between the theory discussed in this dissertation and the experimental results. This allows us to achieve fidelities > 95% for low complexity
quantum states, and > 92% for arbitrary random states, which is a formidable accomplishment for a space of this size. To conclude this work, we study
quantum tomography in an abstract system driven by random dynamics and show the conditions for…
Advisors/Committee Members: Deutsch, Ivan, Deutsch, Ivan, Caves, Carlton, Jessen, Poul, Jayaweera, Sudharman.
Subjects/Keywords: Quantum computers; Quantum entanglement.
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APA (6th Edition):
Riofrío, A. C. (2012). Continuous measurement quantum state tomography of atomic ensembles. (Doctoral Dissertation). University of New Mexico. Retrieved from http://hdl.handle.net/1928/17499
Chicago Manual of Style (16th Edition):
Riofrío, Almeida Carlos. “Continuous measurement quantum state tomography of atomic ensembles.” 2012. Doctoral Dissertation, University of New Mexico. Accessed February 27, 2021.
http://hdl.handle.net/1928/17499.
MLA Handbook (7th Edition):
Riofrío, Almeida Carlos. “Continuous measurement quantum state tomography of atomic ensembles.” 2012. Web. 27 Feb 2021.
Vancouver:
Riofrío AC. Continuous measurement quantum state tomography of atomic ensembles. [Internet] [Doctoral dissertation]. University of New Mexico; 2012. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1928/17499.
Council of Science Editors:
Riofrío AC. Continuous measurement quantum state tomography of atomic ensembles. [Doctoral Dissertation]. University of New Mexico; 2012. Available from: http://hdl.handle.net/1928/17499
University of New Mexico
4.
Madhok, Vaibhav.
Quantum correlations, chaos and information.
Degree: Physics & Astronomy, 2012, University of New Mexico
URL: http://hdl.handle.net/1928/21057
► Quantum chaos is the study of quantum systems whose classical description is chaotic. How does chaos manifest itself in the quantum world? In this spirit,…
(more)
▼ Quantum chaos is the study of
quantum systems whose classical description is chaotic. How does chaos manifest itself in the
quantum world? In this spirit, we study the dynamical generation of
entanglement as a signature of chaos in a system of periodically kicked coupled-tops, where chaos and
entanglement arise from the same physical mechanism. The long-time
entanglement as a function of the position of an initially localized wave packet very closely correlates with the classical phase space surface of section – it is nearly uniform in the chaotic sea, and reproduces the detailed structure of the regular islands. The uniform value in the chaotic sea is explained by the random state conjecture. As classically chaotic dynamics take localized distributions in phase space to random distributions, quantized versions take localized coherent states to pseudo-random states in Hilbert space. Such random states are highly entangled, with an average value near that of the maximally entangled state. For a map with global chaos, we derive that value based on new analytic results for the entropy of random states. For a mixed phase space, we use the Percival conjecture to identify a "chaotic subspace" of the Hilbert space. The typical
entanglement, averaged over the unitarily invariant Haar measure in this subspace, agrees with the long-time averaged
entanglement for initial states in the chaotic sea. In all cases the dynamically generated
entanglement is that of a random complex vector, even though the system is time-reversal invariant, and the Floquet operator is a member of the circular orthogonal ensemble. Continuing on our journey to find the footprints of chaos in the
quantum world, we explore
quantum signatures of classical chaos by studying the rate of information gain in
quantum tomography. The measurement record is obtained as a sequence of expectation values of a Hermitian operator evolving under repeated application of the Floquet operator of the
quantum kicked top on a large ensemble of identical systems. We find an increase in the rate of information gain and hence higher fidelities in the process when the Floquet maps employed increase in chaoticity. We make predictions for the information gain using random matrix theory in the fully chaotic regime and show a remarkable agreement between the two. Finally we discuss how this approach can be used in general as a benchmark for information gain in an experimental implementation based on nonlinear dynamics of atomic spins measured weakly by the Faraday rotation of a laser probe. The last part of this thesis is devoted to the study of the nature of
quantum correlations themselves.
Quantum correlations are at the heart of the weirdness of
quantum mechanics and at the same time serve as a resource for the potential benefits
quantum information processing might provide. For example, Einstein described
quantum entanglement as "spooky action at a distance" ~. However, even
entanglement does not fully capture the complete
quantum character of a…
Advisors/Committee Members: Deutsch, Ivan, Prasad, Sudhakar, Finley, Daniel, Ghose, Shohini.
Subjects/Keywords: Quantum chaos; Quantum entanglement; Quantum computers.
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APA (6th Edition):
Madhok, V. (2012). Quantum correlations, chaos and information. (Doctoral Dissertation). University of New Mexico. Retrieved from http://hdl.handle.net/1928/21057
Chicago Manual of Style (16th Edition):
Madhok, Vaibhav. “Quantum correlations, chaos and information.” 2012. Doctoral Dissertation, University of New Mexico. Accessed February 27, 2021.
http://hdl.handle.net/1928/21057.
MLA Handbook (7th Edition):
Madhok, Vaibhav. “Quantum correlations, chaos and information.” 2012. Web. 27 Feb 2021.
Vancouver:
Madhok V. Quantum correlations, chaos and information. [Internet] [Doctoral dissertation]. University of New Mexico; 2012. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1928/21057.
Council of Science Editors:
Madhok V. Quantum correlations, chaos and information. [Doctoral Dissertation]. University of New Mexico; 2012. Available from: http://hdl.handle.net/1928/21057
University of Pretoria
5.
[No author].
Information measures, entanglement and quantum
evolution
.
Degree: 2008, University of Pretoria
URL: http://upetd.up.ac.za/thesis/available/etd-04212008-090506/
► Due to its great importance, both from the fundamental and from the practical points of view, it is imperative that the concept of entanglement is…
(more)
▼ Due to its great importance, both from the
fundamental and from the practical points of view, it is imperative
that the concept of
entanglement is explored. In this thesis I
investigate the connection between information measures,
entanglement and the “speed” of
quantum evolution. In Chapter 1 a
brief review of the different information and
entanglement measures
as well as of the concept of “speed” of
quantum evolution is given.
An illustration of the
quantum no-cloning theorem in connection
with closed timelike curves is also provided. The work leading up
to this thesis has resulted in the following three publications and
in one conference proceeding: (A) C. Zander and A.R. Plastino,
“Composite systems with extensive Sq (power-law) entropies”,
Physica A 364, (2006) pp. 145-156 (B) S. Curilef, C. Zander and
A.R. Plastino, “Two particles in a double well: illustrating the
connection between
entanglement and the speed of
quantum
evolution”, Eur. J. Phys. 27, (2006) pp. 1193-1203 (C) C. Zander,
A.R. Plastino, A. Plastino and M. Casas, “
Entanglement and the
speed of evolution of multi-partite
quantum systems”, J. Phys. A:
Math. Theor. 40 (11), (2007) pp. 2861-2872 (D) A.R. Plastino and C.
Zander, “Would Closed Timelike Curves Help to Do
Quantum Cloning?”,
AIP Conference Proceedings: A century of relativity physics, ERE
841, (2005) pp. 570-573. Chapter 2 is based on (A) and is an
application of the Sq (powerlaw) entropy. A family of models for
the probability occupancy of phase space exhibiting an extensive
behaviour of Sq and allowing for an explicit analysis of the
thermodynamic limit is proposed. Chapter 3 is based on (B). The
connection between
entanglement and the speed of
quantum evolution
as measured by the time needed to reach an orthogonal state is
discussed in the case of two
quantum particles moving in a
one-dimensional double well. This illustration is meant to be
incorporated into the teaching of
quantum entanglement. Chapter 4
is based on (C). The role of
entanglement in time evolution is
investigated in the cases of two-, three- and N-qubit systems. A
clear correlation is seen between
entanglement and the speed of
evolution. States saturating the speed bound are explored in
detail. Chapter 5 summarizes the conclusions drawn in the previous
chapters.
Advisors/Committee Members: Prof A R Plastino (advisor).
Subjects/Keywords: Quantum evolution;
Entanglement;
UCTD
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APA (6th Edition):
author], [. (2008). Information measures, entanglement and quantum
evolution
. (Masters Thesis). University of Pretoria. Retrieved from http://upetd.up.ac.za/thesis/available/etd-04212008-090506/
Chicago Manual of Style (16th Edition):
author], [No. “Information measures, entanglement and quantum
evolution
.” 2008. Masters Thesis, University of Pretoria. Accessed February 27, 2021.
http://upetd.up.ac.za/thesis/available/etd-04212008-090506/.
MLA Handbook (7th Edition):
author], [No. “Information measures, entanglement and quantum
evolution
.” 2008. Web. 27 Feb 2021.
Vancouver:
author] [. Information measures, entanglement and quantum
evolution
. [Internet] [Masters thesis]. University of Pretoria; 2008. [cited 2021 Feb 27].
Available from: http://upetd.up.ac.za/thesis/available/etd-04212008-090506/.
Council of Science Editors:
author] [. Information measures, entanglement and quantum
evolution
. [Masters Thesis]. University of Pretoria; 2008. Available from: http://upetd.up.ac.za/thesis/available/etd-04212008-090506/
University of California – San Diego
6.
Meill, Alexander.
Constraints on Quantum Entanglement in Symmetric Physical Systems.
Degree: Physics, 2019, University of California – San Diego
URL: http://www.escholarship.org/uc/item/68n995zv
► Quantum entanglement rapidly becomes unwieldy to calculate as the number of particlesand the dimension of the spaces associated to those particles increase. One meaningful approachwhich…
(more)
▼ Quantum entanglement rapidly becomes unwieldy to calculate as the number of particlesand the dimension of the spaces associated to those particles increase. One meaningful approachwhich simplifies that analysis is the restriction to subsets of states which obey some physicallyrelevant symmetry. In this thesis, entanglement properties of totally permutation-symmetric,translationally invariant, and party-site symmetric states are examined, as well as those of smallbond-dimensional matrix product states.
Subjects/Keywords: Physics; Entanglement; Information; Quantum; Symmetry
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APA ·
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APA (6th Edition):
Meill, A. (2019). Constraints on Quantum Entanglement in Symmetric Physical Systems. (Thesis). University of California – San Diego. Retrieved from http://www.escholarship.org/uc/item/68n995zv
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Meill, Alexander. “Constraints on Quantum Entanglement in Symmetric Physical Systems.” 2019. Thesis, University of California – San Diego. Accessed February 27, 2021.
http://www.escholarship.org/uc/item/68n995zv.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Meill, Alexander. “Constraints on Quantum Entanglement in Symmetric Physical Systems.” 2019. Web. 27 Feb 2021.
Vancouver:
Meill A. Constraints on Quantum Entanglement in Symmetric Physical Systems. [Internet] [Thesis]. University of California – San Diego; 2019. [cited 2021 Feb 27].
Available from: http://www.escholarship.org/uc/item/68n995zv.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Meill A. Constraints on Quantum Entanglement in Symmetric Physical Systems. [Thesis]. University of California – San Diego; 2019. Available from: http://www.escholarship.org/uc/item/68n995zv
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University College Cork
7.
Moroni, Stefano T.
Site-controlled quantum dots as sources of quantum light.
Degree: 2018, University College Cork
URL: http://hdl.handle.net/10468/7389
► Quantum information is at its infancy. Though several different approaches are being pursued, the ability of manipulating a quantum state and make two quantum systems…
(more)
▼ Quantum information is at its infancy. Though several different approaches are being pursued, the ability of manipulating a
quantum state and make two
quantum systems interact in a controlled way is still a great challenge, especially in terms of reproducibility and fidelity to the expected theoretical state. Among the possible implementations of
quantum information, photonics seems to offer many technological advantages, the biggest challenge being the availability of a pure, scalable and integrable source of photons with all the required properties. Epitaxial semiconductor
quantum dots (QDs) have been exploited to deliver such
quantum light, e.g. indistinguishable single-photons and polarization-entangled photon pairs, by both optical and electrical injection, generated on demand. However, conventional self-assembled QDs are necessarily characterized by random positioning and randomly distributed optical properties, which limit the feasibility of a technology based on this kind of system. In this context, pyramidal
quantum dots (PQDs) are one very valid alternative to conventional semiconductor QD-based
quantum light sources. In fact, the precise control over the position of the PQDs, together with the uniformity of properties granted by the combination of lithographic methods and metalorganic vapor-phase epitaxy (MOVPE), make this source one of the few scalable systems which have been proven in recent years to emit photons with very interesting properties, polarization-entangled photons, for instance, upon optical excitation. In this work, all the main relevant aspects regarding PQDs are addressed through the most recent results obtained studying the system, starting from fundamental aspects regarding the epitaxy step. A growth model is presented which was also employed in the past as a practical tool to predict the result of the MOVPE in terms of geometry and composition of AlGaAs and GaAs structures inside a pyramidal recess. Here the model is extended in its simulation capabilities in order to include also the epitaxy of InGaAs, the actual material of which the optically active QD layer is made. This is then employed to simulate and understand the physical reason for a previously observed experimental behavior, henceforth confirming the applicability of the extended model to the simulation of InGaAs. Segregation, one fundamental epitaxy-related phenomenon which is predicted as well by the abovementioned growth model, is the key element allowing selective injection of carriers into a PQD, when its structure is embedded into a PIN junction. The whole fabrication process is described, including a selective-contacting technique that allows the realization of the electrical excitation of PQDs, one of the requirements for an efficient integration of PQDs on a photonic platform. On-demand generation of both single photons and entangled photon pairs is demonstrated from this device, the latter also importantly reaching a record fidelity to the ideal entangled state of 0.82 (upon the application of an appropriate…
Advisors/Committee Members: Pelucchi, Emanuele.
Subjects/Keywords: Entanglement; Site-control; Quantum dots
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APA ·
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APA (6th Edition):
Moroni, S. T. (2018). Site-controlled quantum dots as sources of quantum light. (Thesis). University College Cork. Retrieved from http://hdl.handle.net/10468/7389
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Moroni, Stefano T. “Site-controlled quantum dots as sources of quantum light.” 2018. Thesis, University College Cork. Accessed February 27, 2021.
http://hdl.handle.net/10468/7389.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Moroni, Stefano T. “Site-controlled quantum dots as sources of quantum light.” 2018. Web. 27 Feb 2021.
Vancouver:
Moroni ST. Site-controlled quantum dots as sources of quantum light. [Internet] [Thesis]. University College Cork; 2018. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10468/7389.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Moroni ST. Site-controlled quantum dots as sources of quantum light. [Thesis]. University College Cork; 2018. Available from: http://hdl.handle.net/10468/7389
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Technology, Sydney
8.
Janson-Moore, John Robert.
Entanglement : reimaging the crystal-image through the quantum lens.
Degree: 2018, University of Technology, Sydney
URL: http://hdl.handle.net/10453/128775
► What is a photograph? What can a photograph be? This doctorate synthesises quantum theory and post-structuralist discourse, within a media-arts context, to examine photography in…
(more)
▼ What is a photograph? What can a photograph be? This doctorate synthesises quantum theory and post-structuralist discourse, within a media-arts context, to examine photography in new ways. Rather than the conventionally held view of the photograph as a static, purely material object, this exegesis argues that the photograph is better understood as a relational, fluctuating process. The identity of photography, its operation and the resulting formal and narrative consequences are the main areas of this inquiry. The original contribution that this doctorate makes towards research and creative practice is to provide a unique understanding of how photography operates through the philosophical lens of quantum science. Quantum theories such as ‘entanglement’, the ‘many-worlds interpretation’, the ‘uncertainty principle’ and ‘nonlocality’ are employed to consider photography as a destabilised and diffuse medium. Gilles Deleuze’s concept of the ‘crystal-image’ (1989) is applied to explore these questions within a media-arts setting. In this context, the actual and virtual converge, the real and the imaginary entwine, and the photographer, subject and spectator merge with the image itself. Together, quantum theory and Deleuzian post-structuralist discourse are engaged to reveal photography as an indeterminate and open-ended assemblage. The practice-led component of this doctorate, Duplicity, is a large-scale, site-specific photomedia installation that embodies these ideas. Out of this work, the concept of the intra-image is proposed as a novel interpretation of the photographic image – one that is fragmented, entangled and relational. This research aims to contribute towards work by scholars and image-makers operating in the domain of photomedia, within a media-arts context.
Subjects/Keywords: entanglement; quantum lens; crystal-image
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APA (6th Edition):
Janson-Moore, J. R. (2018). Entanglement : reimaging the crystal-image through the quantum lens. (Thesis). University of Technology, Sydney. Retrieved from http://hdl.handle.net/10453/128775
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Janson-Moore, John Robert. “Entanglement : reimaging the crystal-image through the quantum lens.” 2018. Thesis, University of Technology, Sydney. Accessed February 27, 2021.
http://hdl.handle.net/10453/128775.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Janson-Moore, John Robert. “Entanglement : reimaging the crystal-image through the quantum lens.” 2018. Web. 27 Feb 2021.
Vancouver:
Janson-Moore JR. Entanglement : reimaging the crystal-image through the quantum lens. [Internet] [Thesis]. University of Technology, Sydney; 2018. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10453/128775.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Janson-Moore JR. Entanglement : reimaging the crystal-image through the quantum lens. [Thesis]. University of Technology, Sydney; 2018. Available from: http://hdl.handle.net/10453/128775
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Louisiana State University
9.
Richardson, Christopher David.
Entanglement, uncertainty and relativity in fundamental mechanics with an application in QKD.
Degree: PhD, Physical Sciences and Mathematics, 2012, Louisiana State University
URL: etd-06272012-204609
;
https://digitalcommons.lsu.edu/gradschool_dissertations/555
► In this dissertation I will probe the innate uncertainty of quantum mechanics. After deriving the necessary tools I will tackle Popper's experiment, a long misunderstood…
(more)
▼ In this dissertation I will probe the innate uncertainty of quantum mechanics. After deriving the necessary tools I will tackle Popper's experiment, a long misunderstood thought experiment with recent experimental results. I will then discuss how uncertainty changes when making measurements from different relativistic reference frames and resolve some on the tension between quantum mechanics and relativity. Finally I utilize the practical aspect of quantum uncertainty and describe a practical quantum key distribution scheme.
Subjects/Keywords: Relativity QKD; Entanglement; Quantum; Fundamentals
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APA (6th Edition):
Richardson, C. D. (2012). Entanglement, uncertainty and relativity in fundamental mechanics with an application in QKD. (Doctoral Dissertation). Louisiana State University. Retrieved from etd-06272012-204609 ; https://digitalcommons.lsu.edu/gradschool_dissertations/555
Chicago Manual of Style (16th Edition):
Richardson, Christopher David. “Entanglement, uncertainty and relativity in fundamental mechanics with an application in QKD.” 2012. Doctoral Dissertation, Louisiana State University. Accessed February 27, 2021.
etd-06272012-204609 ; https://digitalcommons.lsu.edu/gradschool_dissertations/555.
MLA Handbook (7th Edition):
Richardson, Christopher David. “Entanglement, uncertainty and relativity in fundamental mechanics with an application in QKD.” 2012. Web. 27 Feb 2021.
Vancouver:
Richardson CD. Entanglement, uncertainty and relativity in fundamental mechanics with an application in QKD. [Internet] [Doctoral dissertation]. Louisiana State University; 2012. [cited 2021 Feb 27].
Available from: etd-06272012-204609 ; https://digitalcommons.lsu.edu/gradschool_dissertations/555.
Council of Science Editors:
Richardson CD. Entanglement, uncertainty and relativity in fundamental mechanics with an application in QKD. [Doctoral Dissertation]. Louisiana State University; 2012. Available from: etd-06272012-204609 ; https://digitalcommons.lsu.edu/gradschool_dissertations/555
University of Texas – Austin
10.
Lundgren, Rex Oliver.
Momentum-space entanglement in quantum spin chains.
Degree: PhD, Physics, 2016, University of Texas – Austin
URL: http://hdl.handle.net/2152/41716
► In this dissertation, the momentum-space entanglement properties of several quantum spin chains are investigated. In the second chapter we re- view important results on many-body…
(more)
▼ In this dissertation, the momentum-space
entanglement properties of several
quantum spin chains are investigated. In the second chapter we re- view important results on many-body
entanglement. In the third chapter, we numerically study the momentum-space
entanglement spectra of bosonic and fermionic formulations of the spin-1/2 XXZ chain [Phys. Rev. Lett. 113, 256404 (2014)]. We investigate the behavior of the
entanglement gaps, present in both formulations, across
quantum phase transitions in the XXZ chain. In both cases, finite size scaling suggests that the
entanglement gap closure does not occur at the physical transition points. For bosons, we find that the entan- glement gap depends on the scaling dimension of the conformal field theory as varied by the X X Z anisotropy. For fermions, the infinite
entanglement gap present at the XX point persists well past the phase transition at the Heisenberg point. We elaborate on how this may support the numerical study of phase transitions. In the third chapter, we advocate that in certain critical spin chains a gap in the momentum-space
entanglement spectrum separates the universal part of the spectrum, which is determined by the associated conformal field theory, from the non-universal part, which is specific to the model [arXiv:1512.09030]. We provide affirmative evidence from multicritical spin-1 chains with low energy sectors described by the SU(2)2 or the SU(3)1 Wess-Zumino-Witten model. In chapter four, we study momentum- space en- tanglement in
quantum spin-half ladders [Phys. Rev. B 93, 125107 (2016)]. When the system is gapped, we analytically find the momentum-space entan- glement Hamiltonian is described by a chiral conformal field theory with a central charge of two. When the system is gapless, the
entanglement Hamil- tonian consists of one gapless mode that is linear in subsystem momentum and one mode with a flat dispersion relation. We also analytically include the effect of a certain irrelevant terms (in the renormalization group sense) on the
entanglement spectrum. In chapter six, we investigate the momentum- space
entanglement spectrum after a
quantum quench [arXiv:1603.01997]. We show that the momentum-space
entanglement spectrum of the XXZ spin- half chain possesses many universal features both in equilibrium and after a
quantum quench.
Advisors/Committee Members: Fiete, Gregory A. (advisor), Macdonald, Allan H (committee member), Niu, Qian (committee member), Neitzke, Andrew M (committee member), Tsoi, Maxim (committee member).
Subjects/Keywords: Entanglement; Quantum spin chains
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APA (6th Edition):
Lundgren, R. O. (2016). Momentum-space entanglement in quantum spin chains. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/41716
Chicago Manual of Style (16th Edition):
Lundgren, Rex Oliver. “Momentum-space entanglement in quantum spin chains.” 2016. Doctoral Dissertation, University of Texas – Austin. Accessed February 27, 2021.
http://hdl.handle.net/2152/41716.
MLA Handbook (7th Edition):
Lundgren, Rex Oliver. “Momentum-space entanglement in quantum spin chains.” 2016. Web. 27 Feb 2021.
Vancouver:
Lundgren RO. Momentum-space entanglement in quantum spin chains. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2016. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/2152/41716.
Council of Science Editors:
Lundgren RO. Momentum-space entanglement in quantum spin chains. [Doctoral Dissertation]. University of Texas – Austin; 2016. Available from: http://hdl.handle.net/2152/41716
University of Cambridge
11.
Yoganathan, Mithuna.
The power of restricted quantum computational models.
Degree: PhD, 2021, University of Cambridge
URL: https://www.repository.cam.ac.uk/handle/1810/315974
► Restricted models of quantum computation are ones that have less power than a universal quantum computer. We studied the consequences of removing particular properties from…
(more)
▼ Restricted models of quantum computation are ones that have less power than a universal quantum computer. We studied the consequences of removing particular properties from a universal quantum computer to discover whether those resources were important.In the first part of the thesis we studied universal quantum computers which are implemented using Clifford gates, adaptive measurements, and magic states. The Gottesman–Knill theorem shows that circuits in this form which do not use magic states can be simulated by a classical computer. We extended this result to show that all circuits in this form can be partially simulated; the same computation can be implemented using a smaller quantum computer with the assistance of some polynomial time classical computation. We also identified a subclass of these computations that can be shown to not be entirely classically simulated by any method, given certain complexity theoretic assumptions are true.In the next part of the thesis we examine the role of entanglement in noisy quantum computations. Entanglement is necessary for noiseless quantum computers to have any quantum advantage, but it is not known whether the same is true for mixed state quantum computers. We show that entanglement, unexpectedly, does play a crucial role in the most well known mixed state computer: the one clean qubit model.Finally, we investigate how closely classical simulation is related to another idea of classicality.This notion captures how easily the final state of a computation can be learnt, given samples of measurements from it. We find an extra condition under which a circuit that is classically simulable is also efficiently learnable.
Subjects/Keywords: Quantum Computing; Classical Simulation; Entanglement
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APA (6th Edition):
Yoganathan, M. (2021). The power of restricted quantum computational models. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/315974
Chicago Manual of Style (16th Edition):
Yoganathan, Mithuna. “The power of restricted quantum computational models.” 2021. Doctoral Dissertation, University of Cambridge. Accessed February 27, 2021.
https://www.repository.cam.ac.uk/handle/1810/315974.
MLA Handbook (7th Edition):
Yoganathan, Mithuna. “The power of restricted quantum computational models.” 2021. Web. 27 Feb 2021.
Vancouver:
Yoganathan M. The power of restricted quantum computational models. [Internet] [Doctoral dissertation]. University of Cambridge; 2021. [cited 2021 Feb 27].
Available from: https://www.repository.cam.ac.uk/handle/1810/315974.
Council of Science Editors:
Yoganathan M. The power of restricted quantum computational models. [Doctoral Dissertation]. University of Cambridge; 2021. Available from: https://www.repository.cam.ac.uk/handle/1810/315974
University of Cambridge
12.
Yoganathan, Mithuna.
The power of restricted quantum computational models.
Degree: PhD, 2021, University of Cambridge
URL: https://doi.org/10.17863/CAM.63085
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.821682
► Restricted models of quantum computation are ones that have less power than a universal quantum computer. We studied the consequences of removing particular properties from…
(more)
▼ Restricted models of quantum computation are ones that have less power than a universal quantum computer. We studied the consequences of removing particular properties from a universal quantum computer to discover whether those resources were important. In the first part of the thesis we studied universal quantum computers which are implemented using Clifford gates, adaptive measurements, and magic states. The Gottesman–Knill theorem shows that circuits in this form which do not use magic states can be simulated by a classical computer. We extended this result to show that all circuits in this form can be partially simulated; the same computation can be implemented using a smaller quantum computer with the assistance of some polynomial time classical computation. We also identified a subclass of these computations that can be shown to not be entirely classically simulated by any method, given certain complexity theoretic assumptions are true. In the next part of the thesis we examine the role of entanglement in noisy quantum computations. Entanglement is necessary for noiseless quantum computers to have any quantum advantage, but it is not known whether the same is true for mixed state quantum computers. We show that entanglement, unexpectedly, does play a crucial role in the most well known mixed state computer: the one clean qubit model. Finally, we investigate how closely classical simulation is related to another idea of classicality. This notion captures how easily the final state of a computation can be learnt, given samples of measurements from it. We find an extra condition under which a circuit that is classically simulable is also efficiently learnable.
Subjects/Keywords: Quantum Computing; Classical Simulation; Entanglement
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
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Manager
APA (6th Edition):
Yoganathan, M. (2021). The power of restricted quantum computational models. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.63085 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.821682
Chicago Manual of Style (16th Edition):
Yoganathan, Mithuna. “The power of restricted quantum computational models.” 2021. Doctoral Dissertation, University of Cambridge. Accessed February 27, 2021.
https://doi.org/10.17863/CAM.63085 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.821682.
MLA Handbook (7th Edition):
Yoganathan, Mithuna. “The power of restricted quantum computational models.” 2021. Web. 27 Feb 2021.
Vancouver:
Yoganathan M. The power of restricted quantum computational models. [Internet] [Doctoral dissertation]. University of Cambridge; 2021. [cited 2021 Feb 27].
Available from: https://doi.org/10.17863/CAM.63085 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.821682.
Council of Science Editors:
Yoganathan M. The power of restricted quantum computational models. [Doctoral Dissertation]. University of Cambridge; 2021. Available from: https://doi.org/10.17863/CAM.63085 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.821682
University of Rochester
13.
Howland, Gregory A. (1985 - ).
Compressive sensing for quantum imaging.
Degree: PhD, 2014, University of Rochester
URL: http://hdl.handle.net/1802/28861
► This thesis describes the application of compressive sensing to several challenging problems in quantum imaging with practical and fundamental implications. Compressive sensing is a measurement…
(more)
▼ This thesis describes the application of
compressive sensing to several challenging problems in quantum
imaging with practical and fundamental implications. Compressive
sensing is a measurement technique that compresses a signal during
measurement such that it can be dramatically undersampled.
Compressive sensing has been shown to be an extremely efficient
measurement technique for imaging, particularly when detector
arrays are not available. </br>
The thesis first
reviews compressive sensing through the lens of quantum imaging and
quantum measurement. Four important applications and their
corresponding experiments are then described in
detail. </br>
The first application is a
compressive sensing, photon-counting lidar system. A novel depth
mapping technique that uses standard, linear compressive sensing is
described. Depth maps up to 256 x 256 pixel transverse resolution
are recovered with depth resolution less than 2.54 cm. The first
three-dimensional, photon counting video is recorded at 32 x 32
pixel resolution and 14 frames-per-second. </br>
The second application is the use of compressive sensing for
complementary imaging – simultaneously imaging the
transverse-position and transverse-momentum distributions of
optical photons. This is accomplished by taking random, partial
projections of position followed by imaging the momentum
distribution on a cooled CCD camera. The projections are shown to
not signicantly perturb the photons'
momenta while allowing high
resolution position images to be reconstructed using compressive
sensing. A variety of objects and their diffraction patterns are
imaged including the double slit, triple slit, alphanumeric
characters, and the University of Rochester
logo. </br>
The third application is the use of
compressive sensing to characterize spatial entanglement of photon
pairs produced by spontaneous parametric downconversion. The
technique gives a theoretical speedup N2/log
N for N-dimensional entanglement over the standard raster scanning
technique. Entanglement imaging is demonstrated at 1024
dimensions-per-photon with channel capacities exceeding
8.4
bits-per-photon. In practice, the measurement time is reduced from
310 days for the standard technique to 8 hours for the compressive
technique. An entropic steering inequality is violated to witness
entanglement. </br>
The final application is a
compressive wavefront sensor that unites compressive sensing with
weak measurement. We show how a twisted-nematic spatial light
modulator can be be used to weakly couple an optical field's
position and polarization degrees of freedom. The complex nature of
the weak value is used to directly measure random projections of
the real and imaginary parts of the optical field, where
polarization serves as an ancillary meter. We obtain 256 x 256
pixel wavefronts from only 10,000 random projections.
Photon-counting detectors provide sub-picowatt
sensitivity.
Subjects/Keywords: Compressive sensing; Lidar; Quantum entanglement; Quantum optics
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APA (6th Edition):
Howland, G. A. (. -. ). (2014). Compressive sensing for quantum imaging. (Doctoral Dissertation). University of Rochester. Retrieved from http://hdl.handle.net/1802/28861
Chicago Manual of Style (16th Edition):
Howland, Gregory A (1985 - ). “Compressive sensing for quantum imaging.” 2014. Doctoral Dissertation, University of Rochester. Accessed February 27, 2021.
http://hdl.handle.net/1802/28861.
MLA Handbook (7th Edition):
Howland, Gregory A (1985 - ). “Compressive sensing for quantum imaging.” 2014. Web. 27 Feb 2021.
Vancouver:
Howland GA(-). Compressive sensing for quantum imaging. [Internet] [Doctoral dissertation]. University of Rochester; 2014. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1802/28861.
Council of Science Editors:
Howland GA(-). Compressive sensing for quantum imaging. [Doctoral Dissertation]. University of Rochester; 2014. Available from: http://hdl.handle.net/1802/28861
University of Waterloo
14.
MacLean, Jean-Philippe.
Ultrafast Metrology in the Quantum Domain.
Degree: 2019, University of Waterloo
URL: http://hdl.handle.net/10012/14471
► Single photons are a natural platform for quantum technologies as they support entanglement in many degrees of freedom and are inherently well protected from a…
(more)
▼ Single photons are a natural platform for quantum technologies as they support entanglement in many degrees of freedom and are inherently well protected from a detrimental type of noise called decoherence. In order to fully exploit photons for quantum technologies, it will be necessary to be able to shape, control, and measure their properties in all degrees of freedom: space, time, frequency, and polarization.
The time-frequency degree of freedom of light is of particular interest for quantum information tasks as it supports various encodings, including frequency bins and time bins, and is intrinsically robust for propagation through long-distance fibre links. Applications which harness quantum correlations in this degree of freedom, referred to as energy-time entanglement, include dispersion cancellation and high-dimensional quantum key distribution. However, detection of this entanglement and observation of these effects requires time resolution beyond the capabilities of current photon detectors. Thus, for operations on ultrafast time scales, more powerful and complex methods are required.
In this thesis, we use a nonlinear technique known as optical gating to surpass the limitations in current detectors and measure single photon pairs, improving the time resolution by two orders of magnitude. When a single photon enters a nonlinear medium at the same time as a strong laser pulse, it may upconvert to a higher energy photon. The strong laser pulse effectively acts as an ultrafast shutter or gate and this creates a high resolution snapshot of the photon in time. Optical gating in conjunction with single photon spectrometers then allow us to measure both the spectral and temporal features of photons on subpicosecond time scales.
These high resolution measurements enable us to explore a host of quantum effects which remained previously inaccessible. First, we directly observe energy-time entanglement, analogous to Einstein-Rosen-Podolsky correlations but \emph{in frequency and time}. Then, with full control over the dispersion of each photon, we observe nonlocal dispersion cancellation on femtosecond time scales. We also explore ultrafast interferometry in the quantum domain by temporally resolving two-photon interference from a Franson interferometer and observe a violation of the CHSH-Bell inequality. Finally, we show that, using these measurements, it is possible to reconstruct a two-photon energy-time entangled state. Such measurement capabilities will be essential to precisely control both the spectral and temporal shape of entangled photons and to develop new applications in quantum state engineering.
Subjects/Keywords: Quantum optics; Ultrafast optics; Quantum entanglement
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APA (6th Edition):
MacLean, J. (2019). Ultrafast Metrology in the Quantum Domain. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/14471
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
MacLean, Jean-Philippe. “Ultrafast Metrology in the Quantum Domain.” 2019. Thesis, University of Waterloo. Accessed February 27, 2021.
http://hdl.handle.net/10012/14471.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
MacLean, Jean-Philippe. “Ultrafast Metrology in the Quantum Domain.” 2019. Web. 27 Feb 2021.
Vancouver:
MacLean J. Ultrafast Metrology in the Quantum Domain. [Internet] [Thesis]. University of Waterloo; 2019. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10012/14471.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
MacLean J. Ultrafast Metrology in the Quantum Domain. [Thesis]. University of Waterloo; 2019. Available from: http://hdl.handle.net/10012/14471
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Columbia University
15.
Brainerd, Andrew Eric.
Topics in Cosmology and Quantum Mechanics: Entanglement Harvesting and Cosmic Bubble Collisions.
Degree: 2017, Columbia University
URL: https://doi.org/10.7916/D8PV6XNT
► This dissertation explores two topics located in the intersection of quantum mechanics and cosmology. Entanglement harvesting is a phenomenon in which quantum entanglement can develop…
(more)
▼ This dissertation explores two topics located in the intersection of quantum mechanics and cosmology. Entanglement harvesting is a phenomenon in which quantum entanglement can develop between the states of two Unruh-DeWitt detectors travelling through spacetime by way of mutual interaction with a scalar quantum field. I numerically explore entanglement harvesting of Unruh-DeWitt detectors in Minkowski space travelling with constant acceleration, generalizing previous analytical results which held only in a limiting case. Cosmic bubble collisions arise in inflationary cosmology as a mechanism to begin reheating at the end of inflation. I extend the previously proposed theory of boom and bust inflation which relies on the existence of a large extra dimension by exploring particular inflationary models in which reheating need not begin the first time that two bubble walls collide. This allows for a smaller lower bound on the size of the compact extra dimension in the boom and bust proposal.
Subjects/Keywords: Physics; Cosmology; Quantum theory; Quantum entanglement
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APA (6th Edition):
Brainerd, A. E. (2017). Topics in Cosmology and Quantum Mechanics: Entanglement Harvesting and Cosmic Bubble Collisions. (Doctoral Dissertation). Columbia University. Retrieved from https://doi.org/10.7916/D8PV6XNT
Chicago Manual of Style (16th Edition):
Brainerd, Andrew Eric. “Topics in Cosmology and Quantum Mechanics: Entanglement Harvesting and Cosmic Bubble Collisions.” 2017. Doctoral Dissertation, Columbia University. Accessed February 27, 2021.
https://doi.org/10.7916/D8PV6XNT.
MLA Handbook (7th Edition):
Brainerd, Andrew Eric. “Topics in Cosmology and Quantum Mechanics: Entanglement Harvesting and Cosmic Bubble Collisions.” 2017. Web. 27 Feb 2021.
Vancouver:
Brainerd AE. Topics in Cosmology and Quantum Mechanics: Entanglement Harvesting and Cosmic Bubble Collisions. [Internet] [Doctoral dissertation]. Columbia University; 2017. [cited 2021 Feb 27].
Available from: https://doi.org/10.7916/D8PV6XNT.
Council of Science Editors:
Brainerd AE. Topics in Cosmology and Quantum Mechanics: Entanglement Harvesting and Cosmic Bubble Collisions. [Doctoral Dissertation]. Columbia University; 2017. Available from: https://doi.org/10.7916/D8PV6XNT
Karlstad University
16.
Tang, Wai Ho.
Quantum Entanglement and Superconducting Qubits.
Degree: Science and Technology (starting 2013), 2014, Karlstad University
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-32238
► Conventional computing based on classical technologies is approaching its limits. Therefore scientists are starting to consider the applications of quantum mechanics as a means…
(more)
▼ Conventional computing based on classical technologies is approaching its limits. Therefore scientists are starting to consider the applications of quantum mechanics as a means for constructing more powerful computers. After proposing theoretical methods, many experimental setups have been designed to achieve quantum computing in reality. This thesis gives some background information on the subject of quantum computing. We first review the concept of quantum entanglement, which plays a key role in quantum computing, and then we discuss the physics of the SQUIDs-cavity method proposed by Yang et al., and give the definitions of quantum gates which are the elements that are needed to construct quantum circuits. Finally we give an overview of recent developments of SQUIDs-cavity systems and quantum circuits after Yang et al.'s proposal in 2003. These new developments help to take a step towards the constructions of higher levels of quantum technologies, e.g. quantum algorithms and quantum circuits.
Subjects/Keywords: Quantum; Entanglement; Superconducting; Qubit; SQUID; Quantum gate
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APA (6th Edition):
Tang, W. H. (2014). Quantum Entanglement and Superconducting Qubits. (Thesis). Karlstad University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-32238
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Tang, Wai Ho. “Quantum Entanglement and Superconducting Qubits.” 2014. Thesis, Karlstad University. Accessed February 27, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-32238.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Tang, Wai Ho. “Quantum Entanglement and Superconducting Qubits.” 2014. Web. 27 Feb 2021.
Vancouver:
Tang WH. Quantum Entanglement and Superconducting Qubits. [Internet] [Thesis]. Karlstad University; 2014. [cited 2021 Feb 27].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-32238.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Tang WH. Quantum Entanglement and Superconducting Qubits. [Thesis]. Karlstad University; 2014. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-32238
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Victoria
17.
Sheikholeslam, Seyed Arash.
Quantum mechanics for security related tasks.
Degree: Dept. of Electrical and Computer Engineering, 2012, University of Victoria
URL: http://hdl.handle.net/1828/4127
► This thesis considers the use of quantum mechanics for information security related tasks. Two secure quantum bit commitment protocols are introduced and the security of…
(more)
▼ This thesis considers the use of
quantum mechanics for information security related tasks.
Two secure
quantum bit commitment protocols are introduced and the security of the protocols against attackers is discussed.
The use of
quantum entanglement breaking channels for making a protocol secure is considered and some security bounds are given.
Entanglement measurement in multipartite systems and a universal
entanglement measure are also introduced and discussed.
Advisors/Committee Members: Gulliver, T. Aaron (supervisor).
Subjects/Keywords: Bit commitment; Entanglement; Quantum computation; Quantum information
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APA (6th Edition):
Sheikholeslam, S. A. (2012). Quantum mechanics for security related tasks. (Masters Thesis). University of Victoria. Retrieved from http://hdl.handle.net/1828/4127
Chicago Manual of Style (16th Edition):
Sheikholeslam, Seyed Arash. “Quantum mechanics for security related tasks.” 2012. Masters Thesis, University of Victoria. Accessed February 27, 2021.
http://hdl.handle.net/1828/4127.
MLA Handbook (7th Edition):
Sheikholeslam, Seyed Arash. “Quantum mechanics for security related tasks.” 2012. Web. 27 Feb 2021.
Vancouver:
Sheikholeslam SA. Quantum mechanics for security related tasks. [Internet] [Masters thesis]. University of Victoria; 2012. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1828/4127.
Council of Science Editors:
Sheikholeslam SA. Quantum mechanics for security related tasks. [Masters Thesis]. University of Victoria; 2012. Available from: http://hdl.handle.net/1828/4127
University of Waterloo
18.
Agne, Sascha.
Exploration of Higher-Order Quantum Interference Landscapes.
Degree: 2017, University of Waterloo
URL: http://hdl.handle.net/10012/12307
► Earth, Moon and Sun unite when they star together in the three-body problem, whose intricate plot still baffles us today. For some reason, the factorization…
(more)
▼ Earth, Moon and Sun unite when they star together in the three-body problem, whose intricate plot still baffles us today. For some reason, the factorization of the two-body problem into two one-body problems does not, in general, cross the N=2 border. Is computational irreducibility responsible for this emergence of complexity, as Stephen Wolfram likes to think? We don't know. The introduction to this thesis in Chapter 1, however, makes it clear that the history of science is marked by intermittent encounters of sudden complexities when the number 2 is left behind. In Chapter 2, I present an experiment that is quite similar in spirit, for my colleagues and I observe three-photon interference without two-photon and single-photon interference. We had to overcome significant experimental challenges that are typical for most quantum interference experiments involving more than two photons. Next in line is the three-slit interference experiment. Again a deceptively simple extension of the famous double-slit experiment, we are faced with questions that are difficult to access experimentally: the existence of genuine three-slit interference was first denied and then affirmed, though no experiment has decided yet. My contribution to the study of this problem is outlined in Chapter 3, where I use symmetry of measurement settings in such interference experiments to theoretically derive higher-order interference terms. In Chapter 4, I take a step back in one sense, for we study a two-photon phenomenon, but we also leap forward and discover entirely new interference landscapes. Theoretically and experimentally, I demonstrate how to use a polarization-modulated lasers to go beyond the standard Hong-Ou-Mandel (HOM) dip, and generate both triangular and square wave HOM interference patterns. Two-photon interference is also subject of Chapter 5, but with an interesting twist. While laser HOM interference relies on two independent photons, here we endow the pair with the strongest known correlations, namely entanglement. More specifically, we entangle a polarization and a time-bin qubit and use this hybrid to assess the viability of a rather special interferometer for quantum communication purposes.
Subjects/Keywords: Quantum Interference; Higher-order Correlations; Quantum Entanglement
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APA (6th Edition):
Agne, S. (2017). Exploration of Higher-Order Quantum Interference Landscapes. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/12307
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Agne, Sascha. “Exploration of Higher-Order Quantum Interference Landscapes.” 2017. Thesis, University of Waterloo. Accessed February 27, 2021.
http://hdl.handle.net/10012/12307.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Agne, Sascha. “Exploration of Higher-Order Quantum Interference Landscapes.” 2017. Web. 27 Feb 2021.
Vancouver:
Agne S. Exploration of Higher-Order Quantum Interference Landscapes. [Internet] [Thesis]. University of Waterloo; 2017. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10012/12307.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Agne S. Exploration of Higher-Order Quantum Interference Landscapes. [Thesis]. University of Waterloo; 2017. Available from: http://hdl.handle.net/10012/12307
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Victoria University of Wellington
19.
Rajan, Del.
Quantum Entanglement in Time.
Degree: 2020, Victoria University of Wellington
URL: http://hdl.handle.net/10063/8960
► This thesis is in the field of quantum information science, which is an area that reconceptualizes quantum physics in terms of information. Central to this area…
(more)
▼ This thesis is in the field of
quantum information science, which is an area that reconceptualizes
quantum physics in terms of information. Central to this area is the
quantum effect of
entanglement in space. It is an interdependence among two or more spatially separated
quantum systems that would be impossible to replicate by classical systems. Alternatively, an
entanglement in space can also be viewed as a resource in
quantum information in that it allows the ability to perform information tasks that would be impossible or very difficult to do with only classical information. Two such astonishing applications are
quantum communications which can be harnessed for teleportation, and
quantum computers which can drastically outperform the best classical supercomputers.
In this thesis our focus is on the theoretical aspect of the field, and we provide one of the first expositions on an analogous
quantum effect known as
entanglement in time. It can be viewed as an interdependence of
quantum systems across time, which is stronger than could ever exist between classical systems. We explore this temporal effect within the study of
quantum information and its foundations as well as through relativistic
quantum information.
An original contribution of this thesis is the design of one of the first
quantum information applications of
entanglement in time, namely a
quantum blockchain. We describe how the
entanglement in time provides the
quantum advantage over a classical blockchain. Furthermore, the information encoding procedure of this
quantum blockchain can be interpreted as non-classically influencing the past, and hence the system can be viewed as a `
quantum time machine.'
Advisors/Committee Members: Visser, Matt.
Subjects/Keywords: quantum entanglement in time; entanglement in time; quantum blockchain
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APA (6th Edition):
Rajan, D. (2020). Quantum Entanglement in Time. (Doctoral Dissertation). Victoria University of Wellington. Retrieved from http://hdl.handle.net/10063/8960
Chicago Manual of Style (16th Edition):
Rajan, Del. “Quantum Entanglement in Time.” 2020. Doctoral Dissertation, Victoria University of Wellington. Accessed February 27, 2021.
http://hdl.handle.net/10063/8960.
MLA Handbook (7th Edition):
Rajan, Del. “Quantum Entanglement in Time.” 2020. Web. 27 Feb 2021.
Vancouver:
Rajan D. Quantum Entanglement in Time. [Internet] [Doctoral dissertation]. Victoria University of Wellington; 2020. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10063/8960.
Council of Science Editors:
Rajan D. Quantum Entanglement in Time. [Doctoral Dissertation]. Victoria University of Wellington; 2020. Available from: http://hdl.handle.net/10063/8960
Boston University
20.
Yang, Zhicheng.
Entanglement complexity of quantum states, dynamics and quantum computation.
Degree: PhD, Physics, 2019, Boston University
URL: http://hdl.handle.net/2144/39382
► Quantum entanglement has become the key notion bridging originally distinct fields of research over the last decade, namely, quantum information and computation, condensed matter physics,…
(more)
▼ Quantum entanglement has become the key notion bridging originally distinct fields of research over the last decade, namely,
quantum information and computation, condensed matter physics, and
quantum gravity. Previous studies on
quantum entanglement have largely focused on the
entanglement entropy, which quantifies the amount of
entanglement. However, a natural question arises: is there additional information of a
quantum state that is not captured by the
entanglement entropy alone? For ground states of gapped Hamiltonians, this question has been answered in the affirmative. In this dissertation, I extend this idea to study highly entangled states typically having volume law entropy, and demonstrate that there is indeed much richer information on the complexity of a
quantum state beyond the
entanglement entropy.
In the first part, I study the
entanglement spectrum of highly entangled states corresponding to highly excited eigenstates of non-integrable Hamiltonians, time-evolved states after a
quantum quench with Hamiltonians exhibiting different dynamical phases, and random unitary circuits consisting of random braids of non-Abelian anyons. I demonstrate that the
entanglement spectrum is able to capture the degree of randomness of a
quantum state, which we call the
entanglement complexity. In the context of scrambling, this quantifies the degree of randomness produced by scrambling beyond entropic diagnostics.
Our understanding of
quantum entanglement in condensed matter systems and high energy physics have largely benefited from the field of
quantum computation. In the second part of the dissertation, I present two examples of novel platforms for
quantum computation using state-of-the-art experimental technologies. I demonstrate how one can use hybrid
quantum-classical architecture to solve computational problems based on an optimal variational ansatz of the evolution protocol. I also present a hierarchical architecture of constructing logical Majorana zero modes which can be used for demonstrating non-Abelian braiding statistics experimentally.
Advisors/Committee Members: Chamon, Claudio (advisor).
Subjects/Keywords: Physics; Complexity; Dynamics; Entanglement spectrum; Quantum computation; Quantum entanglement
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Yang, Z. (2019). Entanglement complexity of quantum states, dynamics and quantum computation. (Doctoral Dissertation). Boston University. Retrieved from http://hdl.handle.net/2144/39382
Chicago Manual of Style (16th Edition):
Yang, Zhicheng. “Entanglement complexity of quantum states, dynamics and quantum computation.” 2019. Doctoral Dissertation, Boston University. Accessed February 27, 2021.
http://hdl.handle.net/2144/39382.
MLA Handbook (7th Edition):
Yang, Zhicheng. “Entanglement complexity of quantum states, dynamics and quantum computation.” 2019. Web. 27 Feb 2021.
Vancouver:
Yang Z. Entanglement complexity of quantum states, dynamics and quantum computation. [Internet] [Doctoral dissertation]. Boston University; 2019. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/2144/39382.
Council of Science Editors:
Yang Z. Entanglement complexity of quantum states, dynamics and quantum computation. [Doctoral Dissertation]. Boston University; 2019. Available from: http://hdl.handle.net/2144/39382
21.
Stockill, Robert Hugh James.
Linking confined electron spins through coherent light-matter interaction.
Degree: PhD, 2017, University of Cambridge
URL: https://www.repository.cam.ac.uk/handle/1810/297360
► Electron spins confined to self-assembled quantum dots are considered as nodes for a coherent optical network capable of supporting distributed quantum states. Through a series…
(more)
▼ Electron spins confined to self-assembled quantum dots are considered as nodes for a coherent optical network capable of supporting distributed quantum states. Through a series of experiments, the work contributing to this dissertation examines some of the key criteria for constructing such a network.
First, the ability to optically extract a coherent spin state from the quantum dot without perturbing the nuclear environment is explored: nuclear feedback is an issue that has frustrated previous studies into electron spin coherence in these systems. With the novel techniques we develop, we identify and characterise the previously undetermined intrinsic mechanisms that govern the coherence of the central spin. We show how the coherence of the electron spin is intimately related to the growth of these strained nanostructures. Second, a model network is constructed in which two spins confined to separate quantum dots are projected into a highly entangled state. This is the first time electron spins in distant quantum dots have been entangled, and in doing so we demonstrate controllable entanglement generation at the highest rates recorded for optically accessible qubit definitions.
We investigate the realisation of a hybrid quantum network by demonstrating the first interconnect between wholly different single quantum systems: a semiconductor quantum dot and a trapped ytterbium ion. In forming an optical link between these two complementary qubit definitions, we show that we can circumvent their intrinsic optical differences through coherent photon generation at the quantum dot. A network built from these diverse constituents could combine the ultrafast operations self-assembled quantum dots enable with the long coherence times states in trapped ions experience. Finally, in a step towards truly scalable entanglement generation between quantum dot spins, we design minimally invasive structures that will funnel large proportions of the optical dipole field from the optically dense material that surrounds the quantum dot.
The techniques developed in this work and the knowledge gained from their operation should enable the demonstration the creation of high-order nonlocal states between quantum dot spins, single photons and trapped ions, as well as the development of new optically active systems that will benefit from enhanced spin coherence.
Subjects/Keywords: Quantum Optics; Quantum Dots; Quantum Entanglement; Quantum Information; Spins
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Stockill, R. H. J. (2017). Linking confined electron spins through coherent light-matter interaction. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/297360
Chicago Manual of Style (16th Edition):
Stockill, Robert Hugh James. “Linking confined electron spins through coherent light-matter interaction.” 2017. Doctoral Dissertation, University of Cambridge. Accessed February 27, 2021.
https://www.repository.cam.ac.uk/handle/1810/297360.
MLA Handbook (7th Edition):
Stockill, Robert Hugh James. “Linking confined electron spins through coherent light-matter interaction.” 2017. Web. 27 Feb 2021.
Vancouver:
Stockill RHJ. Linking confined electron spins through coherent light-matter interaction. [Internet] [Doctoral dissertation]. University of Cambridge; 2017. [cited 2021 Feb 27].
Available from: https://www.repository.cam.ac.uk/handle/1810/297360.
Council of Science Editors:
Stockill RHJ. Linking confined electron spins through coherent light-matter interaction. [Doctoral Dissertation]. University of Cambridge; 2017. Available from: https://www.repository.cam.ac.uk/handle/1810/297360
University of Waterloo
22.
Killoran, Nathan.
Entanglement quantification and quantum benchmarking of optical communication devices.
Degree: 2012, University of Waterloo
URL: http://hdl.handle.net/10012/6662
► In this thesis, we develop a number of operational tests and tools for benchmarking the quantum nature of optical quantum communication devices. Using the laws…
(more)
▼ In this thesis, we develop a number of operational tests and tools for benchmarking the quantum nature of optical quantum communication devices. Using the laws of quantum physics, ideal quantum devices can fundamentally outperform their classical counterparts, or even achieve objectives which are classically impossible. Actual devices will not be ideal, but they may still be capable of facilitating quantum communication. Benchmarking tests, based on the presence of entanglement, can be used to verify whether or not imperfect quantum devices offer any advantage over their classical analogs. The general goal in this thesis is to provide strong benchmarking tools which simultaneously require minimal experimental resources but also offer a wide range of applicability. Another major component is the extension of existing qualitative benchmarks (`Is it quantum or classical?') to more quantitative forms (`How quantum is it?'). We provide a number of benchmarking results applicable to two main situations, namely discrete remote state preparation protocols and continuous-variable quantum device testing. The theoretical tools derived throughout this thesis are also applied to the tasks of certifying a remote state preparation experiment and a continuous-variable quantum memory.
Subjects/Keywords: quantum communication; quantum optics; quantum benchmarks; quantum information; entanglement
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❌
APA ·
Chicago ·
MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Killoran, N. (2012). Entanglement quantification and quantum benchmarking of optical communication devices. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/6662
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Killoran, Nathan. “Entanglement quantification and quantum benchmarking of optical communication devices.” 2012. Thesis, University of Waterloo. Accessed February 27, 2021.
http://hdl.handle.net/10012/6662.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Killoran, Nathan. “Entanglement quantification and quantum benchmarking of optical communication devices.” 2012. Web. 27 Feb 2021.
Vancouver:
Killoran N. Entanglement quantification and quantum benchmarking of optical communication devices. [Internet] [Thesis]. University of Waterloo; 2012. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10012/6662.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Killoran N. Entanglement quantification and quantum benchmarking of optical communication devices. [Thesis]. University of Waterloo; 2012. Available from: http://hdl.handle.net/10012/6662
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Cambridge
23.
Stockill, Robert Hugh James.
Linking confined electron spins through coherent light-matter interaction.
Degree: PhD, 2017, University of Cambridge
URL: https://doi.org/10.17863/CAM.44419
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.787757
► Electron spins confined to self-assembled quantum dots are considered as nodes for a coherent optical network capable of supporting distributed quantum states. Through a series…
(more)
▼ Electron spins confined to self-assembled quantum dots are considered as nodes for a coherent optical network capable of supporting distributed quantum states. Through a series of experiments, the work contributing to this dissertation examines some of the key criteria for constructing such a network. First, the ability to optically extract a coherent spin state from the quantum dot without perturbing the nuclear environment is explored: nuclear feedback is an issue that has frustrated previous studies into electron spin coherence in these systems. With the novel techniques we develop, we identify and characterise the previously undetermined intrinsic mechanisms that govern the coherence of the central spin. We show how the coherence of the electron spin is intimately related to the growth of these strained nanostructures. Second, a model network is constructed in which two spins confined to separate quantum dots are projected into a highly entangled state. This is the first time electron spins in distant quantum dots have been entangled, and in doing so we demonstrate controllable entanglement generation at the highest rates recorded for optically accessible qubit definitions. We investigate the realisation of a hybrid quantum network by demonstrating the first interconnect between wholly different single quantum systems: a semiconductor quantum dot and a trapped ytterbium ion. In forming an optical link between these two complementary qubit definitions, we show that we can circumvent their intrinsic optical differences through coherent photon generation at the quantum dot. A network built from these diverse constituents could combine the ultrafast operations self-assembled quantum dots enable with the long coherence times states in trapped ions experience. Finally, in a step towards truly scalable entanglement generation between quantum dot spins, we design minimally invasive structures that will funnel large proportions of the optical dipole field from the optically dense material that surrounds the quantum dot. The techniques developed in this work and the knowledge gained from their operation should enable the demonstration the creation of high-order nonlocal states between quantum dot spins, single photons and trapped ions, as well as the development of new optically active systems that will benefit from enhanced spin coherence.
Subjects/Keywords: Quantum Optics; Quantum Dots; Quantum Entanglement; Quantum Information; Spins
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Stockill, R. H. J. (2017). Linking confined electron spins through coherent light-matter interaction. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.44419 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.787757
Chicago Manual of Style (16th Edition):
Stockill, Robert Hugh James. “Linking confined electron spins through coherent light-matter interaction.” 2017. Doctoral Dissertation, University of Cambridge. Accessed February 27, 2021.
https://doi.org/10.17863/CAM.44419 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.787757.
MLA Handbook (7th Edition):
Stockill, Robert Hugh James. “Linking confined electron spins through coherent light-matter interaction.” 2017. Web. 27 Feb 2021.
Vancouver:
Stockill RHJ. Linking confined electron spins through coherent light-matter interaction. [Internet] [Doctoral dissertation]. University of Cambridge; 2017. [cited 2021 Feb 27].
Available from: https://doi.org/10.17863/CAM.44419 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.787757.
Council of Science Editors:
Stockill RHJ. Linking confined electron spins through coherent light-matter interaction. [Doctoral Dissertation]. University of Cambridge; 2017. Available from: https://doi.org/10.17863/CAM.44419 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.787757
24.
Kobierski, Michael.
Frequency Shifting a Single Photon by Electro-Optic Modulation.
Degree: 2020, University of Waterloo
URL: http://hdl.handle.net/10012/15516
► Entanglement is a rare resource only a select few people worldwide can create. Its fundamentally non-classical behavior seeds a tree of ideas from which transformative…
(more)
▼ Entanglement is a rare resource only a select few people worldwide can create. Its fundamentally non-classical behavior seeds a tree of ideas from which transformative technologies in information processing, communication, and imaging grow. Particularly interesting is entanglement between photons in a pair made by a quantum dot, the most competitive contender among quantum photonic devices.
A strength of semiconductor quantum dots is their deterministic reliability and potential for production at scale. The associated price is anchored in their inherent flaw: sensitivity to imperfections in their shape puts the entanglement they generate in motion. Thus, unless a specific entangled photon pair is caught at just the right moment, it will appear as though it is in fact not entangled at all.
Ingenious methods for making quantum dots perfect again have been devised,almost exclusively built around reshaping the dot by physical, electric, or magnetic means. One completely different proposal stands out, which instead stops the entanglement's motion once it has already been created. As a purely optical technique it can be used for any quantum dot and is completely non-intrusive. This is the method of the rotating half-wave plate.
The entanglement between photons in a pair revolves up to a few billion times per second and halting it requires a correction one-half that rate. Physically spinning a crystal waveplate at that tremendous speed is impossible, but if the properties of a crystal are spun in an identical way such quickly varying entanglement can be restored to its starting point with ease. This is the principle of electro-optic modulation.
This thesis shows the very first demonstration of slowing the frequency of single photons in a stream by using an electro-optical rotating half-wave plate prototype. Initial results show a reduction in frequency by 127.75 million oscillations per second. Any quantum dot whose entanglement precesses no more quickly than 255.5 MHz can thus directly make use of the technique contained herein.
Subjects/Keywords: electro-optic modulation; photonics; quantum; quantum information; quantum dot; entanglement; Photonics; Quantum computing; Quantum dots; Quantum entanglement
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APA ·
Chicago ·
MLA ·
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Export
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Manager
APA (6th Edition):
Kobierski, M. (2020). Frequency Shifting a Single Photon by Electro-Optic Modulation. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/15516
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kobierski, Michael. “Frequency Shifting a Single Photon by Electro-Optic Modulation.” 2020. Thesis, University of Waterloo. Accessed February 27, 2021.
http://hdl.handle.net/10012/15516.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kobierski, Michael. “Frequency Shifting a Single Photon by Electro-Optic Modulation.” 2020. Web. 27 Feb 2021.
Vancouver:
Kobierski M. Frequency Shifting a Single Photon by Electro-Optic Modulation. [Internet] [Thesis]. University of Waterloo; 2020. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10012/15516.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kobierski M. Frequency Shifting a Single Photon by Electro-Optic Modulation. [Thesis]. University of Waterloo; 2020. Available from: http://hdl.handle.net/10012/15516
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
25.
ter Hoeven, Roeland (author).
Entanglement tracking and EPL entanglement generation in quantum networks using the discrete event simulator QNetSquid.
Degree: 2018, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:d94bff29-3c16-45eb-a9f1-40aaf73f9c22
► The realisation of a quantum network in the near future has been made possible by the developments in qubit systems. Links between quantum nodes in…
(more)
▼ The realisation of a quantum network in the near future has been made possible by the developments in qubit systems. Links between quantum nodes in major cities in The Netherlands are scheduled to be demonstrated by 2020. There are many things that need to be considered in the development of a quantum network, in this thesis a few of these will be examined. The first topic is entanglement generation using the EPL (Extreme Photon Loss) protocol in the presence of dephasing noise, which is an existing protocol. Novel contributions include the maximum achievable fidelities and entanglement generation rates, which are obtained using theoretical analysis and numerical simulations. Also for elementary states generated by the EPL protocol it is shown that doing distillation first and then an entanglement swap results in a roughly two times higher rate than the other way around. A new protocol called entanglement tracking is proposed to keep track of the classical information about entanglement in a quantum network. The entanglement tracker is a protocol that runs locally on every node in a quantum network and can communicate with the entanglement trackers of other nodes. The goal of the entanglement tracker is to keep a database with entanglement identifiers that is continuously updated after entanglement is modified. Performance metrics of an entanglement tracking protocol and a command interface with higher layer protocols are defined. We propose a format for entanglement identifiers and show how to update entanglement identifiers after an arbitrary number of entanglement swaps. The entanglement tracker is implemented in the discrete event simulator QNetSquid, which is under development by QuTech. It is applied by simulating a repeater chain using the entanglement tracking protocol, resulting in a completion time as a function of the number of repeaters. Future applications of the entanglement tracker are to assist routing of entanglement in a (large) quantum network, in which the tracker can take care of the classical communication.
Applied Physics
Advisors/Committee Members: Wehner, Stephanie (mentor), Rozpedek, Filip (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: Quantum networks; Entanglement generation; Entanglement distillation; EPL; QNetSquid
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
ter Hoeven, R. (. (2018). Entanglement tracking and EPL entanglement generation in quantum networks using the discrete event simulator QNetSquid. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:d94bff29-3c16-45eb-a9f1-40aaf73f9c22
Chicago Manual of Style (16th Edition):
ter Hoeven, Roeland (author). “Entanglement tracking and EPL entanglement generation in quantum networks using the discrete event simulator QNetSquid.” 2018. Masters Thesis, Delft University of Technology. Accessed February 27, 2021.
http://resolver.tudelft.nl/uuid:d94bff29-3c16-45eb-a9f1-40aaf73f9c22.
MLA Handbook (7th Edition):
ter Hoeven, Roeland (author). “Entanglement tracking and EPL entanglement generation in quantum networks using the discrete event simulator QNetSquid.” 2018. Web. 27 Feb 2021.
Vancouver:
ter Hoeven R(. Entanglement tracking and EPL entanglement generation in quantum networks using the discrete event simulator QNetSquid. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Feb 27].
Available from: http://resolver.tudelft.nl/uuid:d94bff29-3c16-45eb-a9f1-40aaf73f9c22.
Council of Science Editors:
ter Hoeven R(. Entanglement tracking and EPL entanglement generation in quantum networks using the discrete event simulator QNetSquid. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:d94bff29-3c16-45eb-a9f1-40aaf73f9c22
Uniwersytet im. Adama Mickiewicza w Poznaniu
26.
Czechlewski, Mikołaj.
Destylacja splątania ze stanów mieszanych o niepełnym rzędzie macierzy gęstości
.
Degree: 2013, Uniwersytet im. Adama Mickiewicza w Poznaniu
URL: http://hdl.handle.net/10593/4325
► W pracy doktorskiej pod tytułem „Destylacja splątania ze stanów mieszanych o niepełnym rzędzie macierzy gęstości” przedstawiono nowy protokół destylacji splątania. Jest on oparty na metodzie…
(more)
▼ W pracy doktorskiej pod tytułem „Destylacja splątania ze stanów mieszanych o niepełnym rzędzie macierzy gęstości” przedstawiono nowy protokół destylacji splątania. Jest on oparty na metodzie bisekcji i w niektórych przypadkach wykorzystuje jednokierunkowy protokół haszujący. Protokół ten zastosowano do następujących dwuqubitowych stanów splątanych: a) stanu mieszanego składającego się z czystego stanu splątanego i ortogonalnego do niego czystego stanu produktowego; b) stanu mieszanego składającego się z dwóch czystych stanów splątanych różniących się fazą i ortogonalnego do nich czystego stanu produktowego; c) stanu mieszanego składającego się z czystego stanu splątanego i dwóch czystych stanów produktowych (wszystkie stany są wzajemnie ortogonalne). Pokazano, że w przypadku stanów z punktów a) i b) protokół ten zawsze pozwala wydestylować splątanie, a w przypadku stanów z punktu c) protokół ten pozwala wydestylować splątanie dla pewnego zakresu parametrów charakteryzujących stany. Protokół ten porównano z innymi szeroko stosowanymi protokołami i pokazano, że w zastosowaniu do wymienionych stanów jest on od nich na ogół efektywniejszy. Wykorzystując zaproponowany protokół, znaleziono dolne ograniczenie na asystowaną klasyczną komunikacją w dwie strony kwantową pojemność następujących kanałów kwantowych: a) kanału tłumiącego amplitudę; b) kanału tłumiącego amplitudę i zmieniającego fazę; c) uogólnionego kanału tłumiącego amplitudę.
Advisors/Committee Members: Grudka, Andrzej. Promotor (advisor).
Subjects/Keywords: Splątanie;
Entanglement;
Destylacja splątania;
Distillation of entanglement;
Kanały kwantowe;
Quantum channels
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APA (6th Edition):
Czechlewski, M. (2013). Destylacja splątania ze stanów mieszanych o niepełnym rzędzie macierzy gęstości
. (Doctoral Dissertation). Uniwersytet im. Adama Mickiewicza w Poznaniu. Retrieved from http://hdl.handle.net/10593/4325
Chicago Manual of Style (16th Edition):
Czechlewski, Mikołaj. “Destylacja splątania ze stanów mieszanych o niepełnym rzędzie macierzy gęstości
.” 2013. Doctoral Dissertation, Uniwersytet im. Adama Mickiewicza w Poznaniu. Accessed February 27, 2021.
http://hdl.handle.net/10593/4325.
MLA Handbook (7th Edition):
Czechlewski, Mikołaj. “Destylacja splątania ze stanów mieszanych o niepełnym rzędzie macierzy gęstości
.” 2013. Web. 27 Feb 2021.
Vancouver:
Czechlewski M. Destylacja splątania ze stanów mieszanych o niepełnym rzędzie macierzy gęstości
. [Internet] [Doctoral dissertation]. Uniwersytet im. Adama Mickiewicza w Poznaniu; 2013. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10593/4325.
Council of Science Editors:
Czechlewski M. Destylacja splątania ze stanów mieszanych o niepełnym rzędzie macierzy gęstości
. [Doctoral Dissertation]. Uniwersytet im. Adama Mickiewicza w Poznaniu; 2013. Available from: http://hdl.handle.net/10593/4325
University of Rochester
27.
Dixon, P. Benjamin (1981 - ).
Quantum imaging and information.
Degree: PhD, 2012, University of Rochester
URL: http://hdl.handle.net/1802/19266
► Quantum optics provides a unique avenue to investigate quantum mechanical effects. Typically, it is easier to observe the particle-like behavior of a physical object than…
(more)
▼ Quantum optics provides a unique avenue to
investigate quantum mechanical effects. Typically, it is easier to
observe the particle-like behavior of a physical object than it is
to observe wave-like behavior. Optics presents us with the reverse
case, observing the particle-like behavior of light is difficult. I
investigate the utility and limitations of two quantum mechanical
effects – weak values and spatial entanglement – in the context of
experimental quantum optical communication channels. I show that
weak values can be used to increase the signal power and
effectively decrease the noise power in a physical communication
channel, up to the standard quantum limit for signal to noise
ratio. I also show show a method for decreasing the negative
environmental effects on a communication channel using spatial
entanglement and show that such a channel can be used to transmit
over 7 bits of information per joint photon detection
event.
Subjects/Keywords: Imaging; Information; Optics; Quantum; Weak values; Entanglement
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APA (6th Edition):
Dixon, P. B. (. -. ). (2012). Quantum imaging and information. (Doctoral Dissertation). University of Rochester. Retrieved from http://hdl.handle.net/1802/19266
Chicago Manual of Style (16th Edition):
Dixon, P Benjamin (1981 - ). “Quantum imaging and information.” 2012. Doctoral Dissertation, University of Rochester. Accessed February 27, 2021.
http://hdl.handle.net/1802/19266.
MLA Handbook (7th Edition):
Dixon, P Benjamin (1981 - ). “Quantum imaging and information.” 2012. Web. 27 Feb 2021.
Vancouver:
Dixon PB(-). Quantum imaging and information. [Internet] [Doctoral dissertation]. University of Rochester; 2012. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1802/19266.
Council of Science Editors:
Dixon PB(-). Quantum imaging and information. [Doctoral Dissertation]. University of Rochester; 2012. Available from: http://hdl.handle.net/1802/19266
Texas A&M University
28.
Xiong, Han.
Coherence-induced entanglement.
Degree: PhD, Physics, 2006, Texas A&M University
URL: http://hdl.handle.net/1969.1/3797
► Coherence and entanglement are the two key concepts that distinguish quantum mechanics from classical mechanics. Many novel phenomena occuring in the quantum world are due…
(more)
▼ Coherence and
entanglement are the two key concepts that distinguish
quantum
mechanics from classical mechanics. Many novel phenomena occuring in the
quantum
world are due to these two Âphysical quantitiesÂ. They also play essential roles in
quantum computation and
quantum information. For example, coherence, which
says that a
quantum mechanical system could be in a superposition state, makes the
quantum parallel computing scheme possible; and
entanglement, which says that two
quantum systems separated in space could be in an intervened state, is the key factor
in various
quantum teleportation algorithms.
We have studied
entanglement generation in various systems. We found that with
atomic coherence,
entanglement could be generated between two thermal fields with
arbitrarily high temperatures. We also found that temperature difference instead of
the purity of state is essential for the
entanglement generation between an atom and
a thermal field. We discovered that correlated spontaneous emission lasers (CELs)
could be used to generate bright
entanglement laser beams. As a special case of CEL
systems, we studied
entanglement generation in Non-degenerate Optical Parametric
Amplifiers (NOPAs). We performed the input-output calculations for a NOPA system
and showed that the two output optical beams are still entangled. This justifies our idea that CEL (or NOPA) systems can be used as an ideal
entanglement source
for various
quantum information schemes. From an experimental point of view, we
considered the effects of pumping fluctuations on
entanglement generation in CEL
and NOPA systems. We found that these fluctuations, especially the phase diffusion
processes, in the pump laser would greatly reduce the
entanglement generated in such
systems.
Advisors/Committee Members: Scully, Marlan O. (advisor), Zubairy, M. Suhail (advisor), Chen, Goong (committee member), Welch, George R. (committee member).
Subjects/Keywords: Quantum Information; Entanglement
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APA (6th Edition):
Xiong, H. (2006). Coherence-induced entanglement. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/3797
Chicago Manual of Style (16th Edition):
Xiong, Han. “Coherence-induced entanglement.” 2006. Doctoral Dissertation, Texas A&M University. Accessed February 27, 2021.
http://hdl.handle.net/1969.1/3797.
MLA Handbook (7th Edition):
Xiong, Han. “Coherence-induced entanglement.” 2006. Web. 27 Feb 2021.
Vancouver:
Xiong H. Coherence-induced entanglement. [Internet] [Doctoral dissertation]. Texas A&M University; 2006. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1969.1/3797.
Council of Science Editors:
Xiong H. Coherence-induced entanglement. [Doctoral Dissertation]. Texas A&M University; 2006. Available from: http://hdl.handle.net/1969.1/3797
University of Waterloo
29.
Hamel, Deny R.
Direct generation of three-photon entanglement using cascaded downconversion.
Degree: 2013, University of Waterloo
URL: http://hdl.handle.net/10012/8059
► High quality entangled photon sources are a key requirement for many promising quantum optical technologies. However, the production of multi-photon entangled states with good fidelity…
(more)
▼ High quality entangled photon sources are a key requirement for many promising quantum optical technologies. However, the production of multi-photon entangled states with good fidelity is challenging. Current sources of multi-photon entanglement require the use of post-selection, which limits their usefulness for some applications. It has been an open challenge to create a source capable of directly producing three-photon entanglement. An important step in this direction was achieved with the demonstration of photon triplets produced by a new process called cascaded downconversion, but these previous measurements were not sufficient to show whether these photons were in an entangled state and only had detection rates of five triplets per hour. In this thesis, we show the first demonstration of a direct source of three-photon entanglement. Our source is based on cascaded downconversion, and we verify that it produces genuine tripartite entanglement in two degrees of freedom: energy-time and polarization.
The energy-time entanglement is similar to a three-particle generalization of an Einstein-Podolski-Rosen state; the three photons are created simultaneously, yet the sum of their energies is well defined, which is an indication of energy-time entanglement. To prove it, we use time-bandwidth inequalities which check for genuine tripartite entanglement. Our measurements show that the state violates the inequalities with what constitute, to the best of our knowledge, the strongest violation of time-bandwidth inequalities in a tripartite continuous-variable system to date.
We create polarization entanglement by modifying our experimental setup so that two downconversion processes producing orthogonally polarized triplets interfere to create Greenberger-Horne-Zeilinger states. By using highly efficient superconducting nanowire single photon detectors, we improve the detected triplet rate by 2 orders of magnitude to 660 triplets per hour. We characterize the state using quantum state tomography, and find a fidelity of 86% with the ideal state, beating the previous best value for a three-photon entangled state fidelity measured by tomography. We also use the state to perform two tests of local realism. We violate the Mermin and Svetlichny inequalities by 10 and 5 standard deviations respectively, the latter being the strongest violation to date. Finally, we show that, unlike previous sources of tree-photon entanglement, our source can be used as a source of heralded Bell pairs. We demonstrate this by measuring a CHSH inequality with the heralded Bell pairs, and by reconstructing their state using quantum state tomography.
Subjects/Keywords: Entanglement; SPDC; Downconversion; Entangled photons; Quantum optics
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APA (6th Edition):
Hamel, D. R. (2013). Direct generation of three-photon entanglement using cascaded downconversion. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/8059
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hamel, Deny R. “Direct generation of three-photon entanglement using cascaded downconversion.” 2013. Thesis, University of Waterloo. Accessed February 27, 2021.
http://hdl.handle.net/10012/8059.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hamel, Deny R. “Direct generation of three-photon entanglement using cascaded downconversion.” 2013. Web. 27 Feb 2021.
Vancouver:
Hamel DR. Direct generation of three-photon entanglement using cascaded downconversion. [Internet] [Thesis]. University of Waterloo; 2013. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10012/8059.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hamel DR. Direct generation of three-photon entanglement using cascaded downconversion. [Thesis]. University of Waterloo; 2013. Available from: http://hdl.handle.net/10012/8059
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Cambridge
30.
Caulton, Adam.
Issues of identity and individuality in quantum mechanics.
Degree: PhD, 2015, University of Cambridge
URL: https://www.repository.cam.ac.uk/handle/1810/249007https://www.repository.cam.ac.uk/bitstream/1810/249007/2/license.txt
;
https://www.repository.cam.ac.uk/bitstream/1810/249007/3/license_rdf
;
https://www.repository.cam.ac.uk/bitstream/1810/249007/4/Thesis.pdf.txt
;
https://www.repository.cam.ac.uk/bitstream/1810/249007/5/Thesis.pdf.jpg
► This dissertation is ordered into three Parts. Part I is an investigation into identity, indiscernibility and individuality in logic and metaphysics. In Chapter 2, I…
(more)
▼ This dissertation is ordered into three Parts. Part I is an investigation into identity, indiscernibility and individuality in logic and metaphysics. In Chapter 2, I investigate identity and discernibility in classical first-order logic. My aim will will be to define four different ways in which objects can be discerned from one another, and to relate these definitions: (i) to the idea of symmetry; and (ii) to the idea of individuality.
In Chapter 3, the four kinds of discernibility are put to use in defining four rival metaphysical theses about indiscernibility and individuality.
Part II sets up a philosophical framework for the work of Part III. In Chapter 4, I give an account of the rational reconstruction of concepts, inspired chiefly by Carnap and Haslanger. I also offer an account of the interpretation of physical theories. In Chapter 5, I turn to the specific problem of finding candidate concepts of particle. I present five desiderata that any putative explication ought to satisfy, in order that the proposed concept is a concept of particle at all.
Part III surveys three rival proposals for the concept of particle in quantum mechanics. In Chapter 6, I define factorism and distinguish it from haecceitism. I then propose an amendment to recent work by Saunders, Muller and Seevinck, which seeks to show that factorist particles are all at least weakly discernible. I then present reasons for rejecting factorism. In Chapter 7, I investigate and build on recent heterodox proposals by Ghirardi, Marinatto and Weber about the most natural concept of entanglement, and by Zanardi about the idea of a natural decomposition of an assembly. In Chapter 8, I appraise the first of my two heterodox proposals for the concept of particle, varietism. I define varietism, and then compare its performance against the desiderata laid out in Chapter 5. I argue that, despite its many merits, varietism suffers a fatal ambiguity problem. In Chapter 9, I present the second heterodox proposal: emergentism. I argue that emergentism provides the best concept of particle, but that it is does so imperfectly; so there may be no concept of particle to be had in quantum mechanics. If emergentism is true, then particles are (higher-order) properties of the assembly, itself treated as the basic bearer of properties.
Subjects/Keywords: Quantum mechanics; Identity; Individuality; Discernibility; Particle; Entanglement
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APA (6th Edition):
Caulton, A. (2015). Issues of identity and individuality in quantum mechanics. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/249007https://www.repository.cam.ac.uk/bitstream/1810/249007/2/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/249007/3/license_rdf ; https://www.repository.cam.ac.uk/bitstream/1810/249007/4/Thesis.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/249007/5/Thesis.pdf.jpg
Chicago Manual of Style (16th Edition):
Caulton, Adam. “Issues of identity and individuality in quantum mechanics.” 2015. Doctoral Dissertation, University of Cambridge. Accessed February 27, 2021.
https://www.repository.cam.ac.uk/handle/1810/249007https://www.repository.cam.ac.uk/bitstream/1810/249007/2/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/249007/3/license_rdf ; https://www.repository.cam.ac.uk/bitstream/1810/249007/4/Thesis.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/249007/5/Thesis.pdf.jpg.
MLA Handbook (7th Edition):
Caulton, Adam. “Issues of identity and individuality in quantum mechanics.” 2015. Web. 27 Feb 2021.
Vancouver:
Caulton A. Issues of identity and individuality in quantum mechanics. [Internet] [Doctoral dissertation]. University of Cambridge; 2015. [cited 2021 Feb 27].
Available from: https://www.repository.cam.ac.uk/handle/1810/249007https://www.repository.cam.ac.uk/bitstream/1810/249007/2/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/249007/3/license_rdf ; https://www.repository.cam.ac.uk/bitstream/1810/249007/4/Thesis.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/249007/5/Thesis.pdf.jpg.
Council of Science Editors:
Caulton A. Issues of identity and individuality in quantum mechanics. [Doctoral Dissertation]. University of Cambridge; 2015. Available from: https://www.repository.cam.ac.uk/handle/1810/249007https://www.repository.cam.ac.uk/bitstream/1810/249007/2/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/249007/3/license_rdf ; https://www.repository.cam.ac.uk/bitstream/1810/249007/4/Thesis.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/249007/5/Thesis.pdf.jpg
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Open Access Theses and Dissertations
