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University of Oxford
1.
Thirumalai, Keshav.
High-fidelity mixed species entanglement of trapped ions.
Degree: PhD, 2020, University of Oxford
URL: http://ora.ox.ac.uk/objects/uuid:74631d0e-2873-43c4-8f9a-d7ec470e2170 
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.808386
► Harnessing quantum mechanics to solve problems intractable on classical computers is one of the foremost goals of applied physics. Trapped ions make an excellent physical…
(more)
▼ Harnessing quantum mechanics to solve problems intractable on classical computers is one of the foremost goals of applied physics. Trapped ions make an excellent physical platform for such a quantum computer, as they have demonstrated unparalleled qubit operation fidelities and memory times, but significant challenges remain in scaling up these systems. A promising scalable architecture is a photonically connected network of mixed element trapped ion nodes, each containing a few ions of two species. Poor quality remote entanglement links between nodes can be tolerated, if entanglement between ions in the same node can be achieved with high fidelity. While local gates have been repeatedly demonstrated between ions of the same species, the fidelity of mixed element quantum gates have not previously surpassed the fault tolerant threshold, above which errors can in principle be corrected. In this thesis we demonstrate an entangling operation between ⁴³Ca⁺, useful for its long lived qubits, and ⁸⁸Sr⁺, well suited for remote entanglement, using a novel mechanism requiring only one laser to manipulate both species. This relatively simple scheme, which is independent of either qubit frequency, allows us to achieve Bell state fidelities of F = 99.8(1)%. We assess the operation of the gate further with state and process tomography, which achieve Bell state fidelity F = 98.1% and average gate fidelity F̅ = 99.05(6)% respectively, though they are hampered by experimental drifts during the long data collection. Finally, we use interleaved randomised benchmarking to get the best estimate of our gate errors, finding an average gate fidelity of F̅ = 99.62(3)% for a sequence of 60 interleaved gates. Along with a demonstration of entanglement between two ⁸⁸Sr⁺ ions, achieved with fidelity F = 95.9(4)%, this work paves the way towards demonstrating an elementary mixed species quantum network in future experiments.
Subjects/Keywords: Trapped ions; Physics; Quantum computing
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APA (6th Edition):
Thirumalai, K. (2020). High-fidelity mixed species entanglement of trapped ions. (Doctoral Dissertation). University of Oxford. Retrieved from http://ora.ox.ac.uk/objects/uuid:74631d0e-2873-43c4-8f9a-d7ec470e2170 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.808386
Chicago Manual of Style (16th Edition):
Thirumalai, Keshav. “High-fidelity mixed species entanglement of trapped ions.” 2020. Doctoral Dissertation, University of Oxford. Accessed February 27, 2021.
http://ora.ox.ac.uk/objects/uuid:74631d0e-2873-43c4-8f9a-d7ec470e2170 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.808386.
MLA Handbook (7th Edition):
Thirumalai, Keshav. “High-fidelity mixed species entanglement of trapped ions.” 2020. Web. 27 Feb 2021.
Vancouver:
Thirumalai K. High-fidelity mixed species entanglement of trapped ions. [Internet] [Doctoral dissertation]. University of Oxford; 2020. [cited 2021 Feb 27].
Available from: http://ora.ox.ac.uk/objects/uuid:74631d0e-2873-43c4-8f9a-d7ec470e2170 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.808386.
Council of Science Editors:
Thirumalai K. High-fidelity mixed species entanglement of trapped ions. [Doctoral Dissertation]. University of Oxford; 2020. Available from: http://ora.ox.ac.uk/objects/uuid:74631d0e-2873-43c4-8f9a-d7ec470e2170 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.808386
2.
Ballance, Timothy George.
An ultraviolet fibre-cavity for strong ion-photon interaction.
Degree: PhD, 2017, University of Cambridge
URL: https://www.repository.cam.ac.uk/handle/1810/267687
► We investigate the coupling of a single trapped ion to a miniature optical cavity operating in the ultraviolet. Our cavity provides a source of single…
(more)
▼ We investigate the coupling of a single trapped ion to a miniature optical cavity operating in the ultraviolet. Our cavity provides a source of single photons at a high rate into a single spatial mode. Using our apparatus, we have demonstrated the highest atom-cavity coupling rate achieved with a single ion by an order of magnitude. When the ion is continuously excited, we observe phase-sensitive correlations between emission into free-space and into the cavity mode, which can be explained by a cavity induced back-action effect on a driven dipole. We demonstrate coherent manipulation of a hyperfine qubit and ultra-short optical π rotations, which are essential tools for creation and detection of spin-photon entanglement.
To this end, we have developed optical fibre-based Fabry-Perot cavities in the ultraviolet spectral range. These cavities operate near the primary dipole transition of Yb at 370 nm, and allow us to couple a pure atomic two-level system offered by a single trapped ion to the cavity mode.
A new Paul trap apparatus in an ultra-high vacuum chamber has been built which allows for the integration of these cavities at very small ion-mirror separations. In order for independent operation of the trap, a compact system of diode lasers has been built which are stabilised to low-drift optical reference cavities. Coherent control of the hyperfine qubit in Yb 171 is achieved through application of microwave radiation, and ultra-short optical π rotations are performed with resonant light pulses derived from a frequency-doubled mode-locked titanium-sapphire laser. The experiment is controlled through a system of hardware and software which has been developed in a modular fashion and will allow for efficient control on the nanosecond time-scale when several such systems are interconnected.
The success of our system opens the door to future experiments with trapped ions which will reach the strong coupling regime with a single ion. Furthermore, when operated in the fast-cavity regime, systems based on our approach will enable high-efficiency collection of photons from the ion into the single mode of an optical fibre. These systems will allow for the generation of distributed entanglement and will prove ideal as nodes in a larger quantum network of trapped ions.
Subjects/Keywords: trapped ions; cavity qed; quantum information
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APA (6th Edition):
Ballance, T. G. (2017). An ultraviolet fibre-cavity for strong ion-photon interaction. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/267687
Chicago Manual of Style (16th Edition):
Ballance, Timothy George. “An ultraviolet fibre-cavity for strong ion-photon interaction.” 2017. Doctoral Dissertation, University of Cambridge. Accessed February 27, 2021.
https://www.repository.cam.ac.uk/handle/1810/267687.
MLA Handbook (7th Edition):
Ballance, Timothy George. “An ultraviolet fibre-cavity for strong ion-photon interaction.” 2017. Web. 27 Feb 2021.
Vancouver:
Ballance TG. An ultraviolet fibre-cavity for strong ion-photon interaction. [Internet] [Doctoral dissertation]. University of Cambridge; 2017. [cited 2021 Feb 27].
Available from: https://www.repository.cam.ac.uk/handle/1810/267687.
Council of Science Editors:
Ballance TG. An ultraviolet fibre-cavity for strong ion-photon interaction. [Doctoral Dissertation]. University of Cambridge; 2017. Available from: https://www.repository.cam.ac.uk/handle/1810/267687
University of Oxford
3.
Baynham, Charles.
Frequency metrology at the 10⁻¹⁸ level with an ytterbium ion optical clock.
Degree: PhD, 2018, University of Oxford
URL: http://ora.ox.ac.uk/objects/uuid:cdab6fc3-d535-4173-bb56-f01a3f1896f7
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.786135
► Atomic clocks, the most accurate instruments in existence, are reaching new levels of precision. These devices now find novel uses-from the exploration of relativity [1]…
(more)
▼ Atomic clocks, the most accurate instruments in existence, are reaching new levels of precision. These devices now find novel uses-from the exploration of relativity [1] to the detection of dark matter [2, 3]-all from same principle: measurement of the frequency of the light that excites a reference atomic transition. The 2S1/2 (F 0) → 2F7/2 (F 3) electric octupole (E3) transition in 171Yb+, with its Δν ≈ 1 nHz [4] linewidth and low sensitivity to external electromagnetic fields, lends itself to this usage [5]. We probe this transition in a single 171Yb+ ion held in a newly-designed endcap RF trap [6]. This design achieves a low temperature rise of 0.14(14)K. Excess micromotion in the trap is automatically compensated, resulting in a fractional frequency uncertainty of the combined RF-Stark and 2nd order Doppler shifts of 3.6 × 10−19. Anomalous phonon heating rates in the radial plane were measured as (−4.9 ± 5.2) s−1 and (−1.3 ± 3.6) s−1 for secular frequencies of 446 kHz and 470 kHz. The ion's differential polarisability at λ = 7 μm has been measured, suggesting a reduction in the BBR-related systematic error of the electric quadrupole (E2) transition by a factor of 5 and confirming the results of a previous measurement for the E3, performed using a different method [7]. However, a limitation prevented full confidence in our uncertainty levels. To pre-stabilize the frequency of our laser a 28 cm long, ultra-stable Fabry-Pérot cavity was constructed and used to drive the E3 atomic resonance with a linewidth of 1.64(2) Hz. Its finesse was measured as 458 000 and, in an atomic lock, a clock stability of 1.9 × 10−15 (τ/1 s)−1/2 was observed. The laser's frequency was measured and its stability transferred to other wavelengths via a femtosecond optical frequency comb. An international clock comparison campaign was carried out via satellite-mediated microwave links: the first of its scale, involving 4 National Measurement Institutes (NMIs) and 5 optical atomic clocks. A new technique was developed to analyse the resulting data and to characterize its uncertainty. The lowest fractional uncertainty in the comparison between any pair of clocks was 2.8 × 10−16. Finally, an absolute measurement of the E3 transition has been carried out through a link to International Atomic Time (TAI), without a local primary standard. The transition frequency was measured to be 642 121 496 772 645.17(22) Hz: the best measurement of this transition to date [8, 9].
Subjects/Keywords: trapped ions; frequency metrology; atomic physics
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APA (6th Edition):
Baynham, C. (2018). Frequency metrology at the 10⁻¹⁸ level with an ytterbium ion optical clock. (Doctoral Dissertation). University of Oxford. Retrieved from http://ora.ox.ac.uk/objects/uuid:cdab6fc3-d535-4173-bb56-f01a3f1896f7 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.786135
Chicago Manual of Style (16th Edition):
Baynham, Charles. “Frequency metrology at the 10⁻¹⁸ level with an ytterbium ion optical clock.” 2018. Doctoral Dissertation, University of Oxford. Accessed February 27, 2021.
http://ora.ox.ac.uk/objects/uuid:cdab6fc3-d535-4173-bb56-f01a3f1896f7 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.786135.
MLA Handbook (7th Edition):
Baynham, Charles. “Frequency metrology at the 10⁻¹⁸ level with an ytterbium ion optical clock.” 2018. Web. 27 Feb 2021.
Vancouver:
Baynham C. Frequency metrology at the 10⁻¹⁸ level with an ytterbium ion optical clock. [Internet] [Doctoral dissertation]. University of Oxford; 2018. [cited 2021 Feb 27].
Available from: http://ora.ox.ac.uk/objects/uuid:cdab6fc3-d535-4173-bb56-f01a3f1896f7 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.786135.
Council of Science Editors:
Baynham C. Frequency metrology at the 10⁻¹⁸ level with an ytterbium ion optical clock. [Doctoral Dissertation]. University of Oxford; 2018. Available from: http://ora.ox.ac.uk/objects/uuid:cdab6fc3-d535-4173-bb56-f01a3f1896f7 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.786135
University of Maryland
4.
Manning, Timothy Andrew.
Quantum Information Processing with Trapped Ion Chains.
Degree: Physics, 2014, University of Maryland
URL: http://hdl.handle.net/1903/15156
► Trapped atomic ion systems are currently the most advanced platform for quantum information processing. Their long coherence times, pristine state initialization and detection, and precisely…
(more)
▼ Trapped atomic ion systems are currently the most advanced platform for quantum information processing. Their long coherence times, pristine state initialization and detection, and precisely controllable and versatile interactions make them excellent quantum systems for experiments in quantum computation and quantum simulation. One of the more promising schemes for quantum computing consists of performing single and multi-qubit quantum gates on qubits in a linear ion crystal. Some of the key challenges of scaling such a system are the individual addressing of arbitrary subsets of
ions and controlling the growing complexity of motional mode interactions as the number of qubits increases or when the gates are performed faster. Traditional entangling quantum gates between ion qubits use laser pulses to couple the qubit states to the collective motion of the crystal, thereby generating a spin-spin interaction that can produce entanglement between selected qubits. The intrinsic limitations on the performance of gates using this method can be alleviated by applying optimally shaped pulses instead of pulses with constant amplitude. This thesis explains the theory behind this pulse shaping scheme and how it is implemented on a chain of Yb
ions held in a linear radiofrequency `Paul' trap. Several experiments demonstrate the technique in chains of two, three, and five
ions using various types of pulse shapes. A tightly focused individual addressing beam allows us to apply the entangling gates to a target pair of
ions, and technical issues related to such tight focusing are discussed. Other advantages to the pulse shaping scheme include a robustness against detuning errors and the possibility of suppressing undesirable coupling due to optical spillover on neighboring
ions. Combined with ion shuttling, we harness these features to perform sequential gates to different qubit pairs in order to create genuine tripartite entangled states and demonstrate the programmable quantum information processing capability of our system.
Advisors/Committee Members: Monroe, Christopher R (advisor).
Subjects/Keywords: Physics; quantum computing; quantum information; trapped ions
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APA (6th Edition):
Manning, T. A. (2014). Quantum Information Processing with Trapped Ion Chains. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/15156
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):
Manning, Timothy Andrew. “Quantum Information Processing with Trapped Ion Chains.” 2014. Thesis, University of Maryland. Accessed February 27, 2021.
http://hdl.handle.net/1903/15156.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Manning, Timothy Andrew. “Quantum Information Processing with Trapped Ion Chains.” 2014. Web. 27 Feb 2021.
Vancouver:
Manning TA. Quantum Information Processing with Trapped Ion Chains. [Internet] [Thesis]. University of Maryland; 2014. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1903/15156.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Manning TA. Quantum Information Processing with Trapped Ion Chains. [Thesis]. University of Maryland; 2014. Available from: http://hdl.handle.net/1903/15156
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Cambridge
5.
Ballance, Timothy George.
An ultraviolet fibre-cavity for strong ion-photon interaction.
Degree: PhD, 2017, University of Cambridge
URL: https://doi.org/10.17863/CAM.13621
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.725515
► We investigate the coupling of a single trapped ion to a miniature optical cavity operating in the ultraviolet. Our cavity provides a source of single…
(more)
▼ We investigate the coupling of a single trapped ion to a miniature optical cavity operating in the ultraviolet. Our cavity provides a source of single photons at a high rate into a single spatial mode. Using our apparatus, we have demonstrated the highest atom-cavity coupling rate achieved with a single ion by an order of magnitude. When the ion is continuously excited, we observe phase-sensitive correlations between emission into free-space and into the cavity mode, which can be explained by a cavity induced back-action effect on a driven dipole. We demonstrate coherent manipulation of a hyperfine qubit and ultra-short optical π rotations, which are essential tools for creation and detection of spin-photon entanglement. To this end, we have developed optical fibre-based Fabry-Perot cavities in the ultraviolet spectral range. These cavities operate near the primary dipole transition of Yb at 370 nm, and allow us to couple a pure atomic two-level system offered by a single trapped ion to the cavity mode. A new Paul trap apparatus in an ultra-high vacuum chamber has been built which allows for the integration of these cavities at very small ion-mirror separations. In order for independent operation of the trap, a compact system of diode lasers has been built which are stabilised to low-drift optical reference cavities. Coherent control of the hyperfine qubit in Yb 171 is achieved through application of microwave radiation, and ultra-short optical π rotations are performed with resonant light pulses derived from a frequency-doubled mode-locked titanium-sapphire laser. The experiment is controlled through a system of hardware and software which has been developed in a modular fashion and will allow for efficient control on the nanosecond time-scale when several such systems are interconnected. The success of our system opens the door to future experiments with trapped ions which will reach the strong coupling regime with a single ion. Furthermore, when operated in the fast-cavity regime, systems based on our approach will enable high-efficiency collection of photons from the ion into the single mode of an optical fibre. These systems will allow for the generation of distributed entanglement and will prove ideal as nodes in a larger quantum network of trapped ions.
Subjects/Keywords: 539.7; trapped ions; cavity qed; quantum information
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APA ·
Chicago ·
MLA ·
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CSE |
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Manager
APA (6th Edition):
Ballance, T. G. (2017). An ultraviolet fibre-cavity for strong ion-photon interaction. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.13621 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.725515
Chicago Manual of Style (16th Edition):
Ballance, Timothy George. “An ultraviolet fibre-cavity for strong ion-photon interaction.” 2017. Doctoral Dissertation, University of Cambridge. Accessed February 27, 2021.
https://doi.org/10.17863/CAM.13621 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.725515.
MLA Handbook (7th Edition):
Ballance, Timothy George. “An ultraviolet fibre-cavity for strong ion-photon interaction.” 2017. Web. 27 Feb 2021.
Vancouver:
Ballance TG. An ultraviolet fibre-cavity for strong ion-photon interaction. [Internet] [Doctoral dissertation]. University of Cambridge; 2017. [cited 2021 Feb 27].
Available from: https://doi.org/10.17863/CAM.13621 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.725515.
Council of Science Editors:
Ballance TG. An ultraviolet fibre-cavity for strong ion-photon interaction. [Doctoral Dissertation]. University of Cambridge; 2017. Available from: https://doi.org/10.17863/CAM.13621 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.725515
University of Waterloo
6.
Sajjan, Manas.
Experimental and theoretical investigations of radio-frequency and optical trapping potentials for atomic ions.
Degree: 2020, University of Waterloo
URL: http://hdl.handle.net/10012/16433
► Over the years, trapped ion have emerged as one of the premier candidates for universal quantum simulation due to its long coherence time, low initialization…
(more)
▼ Over the years, trapped ion have emerged as one of the premier candidates for universal
quantum simulation due to its long coherence time, low initialization and detection errors,
robust high-fidelity gate sets and fully connected yet tunable spin-graph. In this thesis
we exclusively focus on the generation of the trapping potential in a four-rod trap, one of
the most commonly studied ion-trapping architecture. We elaborate the fabrication of the
trapping electrodes using electro-etching techniques and explore the underlying mechanism
in details. We discuss how these electrodes are powered by DC and RF field to generate
the confining potential responsible for trapping the ions of interest in 3D. We conclude by
studying how this trapping potential can be modified by external means like using an optical
tweezer. Employing such an optical tweezer we propose a new quantum-thermodynamic
protocol which shall allow us to experimentally access the thermal properties of a mixed specie
ion chain using a single-specie ion chain. The scheme is based on Jarynski's equality
and obviates the need to trap dual-ionic species as far as illustrating the mechanical properties
of the chain are concerned. We present results ratifying the utility of the proposal.
The scheme is useful to obtain mode-specific thermal properties hitherto unexplored experimentally.
Subjects/Keywords: Quantum Information; Trapped Ions; Quantum Simulation
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APA ·
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APA (6th Edition):
Sajjan, M. (2020). Experimental and theoretical investigations of radio-frequency and optical trapping potentials for atomic ions. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/16433
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):
Sajjan, Manas. “Experimental and theoretical investigations of radio-frequency and optical trapping potentials for atomic ions.” 2020. Thesis, University of Waterloo. Accessed February 27, 2021.
http://hdl.handle.net/10012/16433.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sajjan, Manas. “Experimental and theoretical investigations of radio-frequency and optical trapping potentials for atomic ions.” 2020. Web. 27 Feb 2021.
Vancouver:
Sajjan M. Experimental and theoretical investigations of radio-frequency and optical trapping potentials for atomic ions. [Internet] [Thesis]. University of Waterloo; 2020. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10012/16433.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sajjan M. Experimental and theoretical investigations of radio-frequency and optical trapping potentials for atomic ions. [Thesis]. University of Waterloo; 2020. Available from: http://hdl.handle.net/10012/16433
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Georgia Tech
7.
Campbell, Corey Justin.
Trapping, laser cooling, and spectroscopy of Thorium IV.
Degree: PhD, Physics, 2012, Georgia Tech
URL: http://hdl.handle.net/1853/48973
► Application of precision laser spectroscopy and optical clock technology to the ground and metastable, first excited state of the ²²⁹Th nucleus at < 10 eV…
(more)
▼ Application of precision laser spectroscopy and optical clock technology to the ground and metastable, first excited state of the ²²⁹Th nucleus at < 10 eV has significant potential for use in optical frequency metrology and tests of variation of fundamental constants. This work is a report on the development of required technologies to realize such a nuclear optical clock with a single,
trapped, laser cooled ²²⁹Th³⁺ ion. Creation, trapping, laser cooling, and precision spectroscopy are developed and refined first with the naturally occurring isotope, ²³²Th. These technologies are then extended to laser cooling and precision laser spectroscopy of the electronic structure of ²²⁹Th³⁺. An efficient optical excitation search protocol to directly observe this transition via the electron bridge is proposed. The extraordinarily small systematic clock shifts are estimated and the likely extraordinarily large sensitivity of the clock to variation of the fine structure constant is discussed.
Advisors/Committee Members: Kuzmich, Alex (advisor), Brown, Ken (committee member), de Heer, Walt (committee member), First, Phil (committee member), Kennedy, T. A. Brian (committee member).
Subjects/Keywords: Ion trapping; Nuclear clock; Thorium; Trapped ions; Ions
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APA (6th Edition):
Campbell, C. J. (2012). Trapping, laser cooling, and spectroscopy of Thorium IV. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/48973
Chicago Manual of Style (16th Edition):
Campbell, Corey Justin. “Trapping, laser cooling, and spectroscopy of Thorium IV.” 2012. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/48973.
MLA Handbook (7th Edition):
Campbell, Corey Justin. “Trapping, laser cooling, and spectroscopy of Thorium IV.” 2012. Web. 27 Feb 2021.
Vancouver:
Campbell CJ. Trapping, laser cooling, and spectroscopy of Thorium IV. [Internet] [Doctoral dissertation]. Georgia Tech; 2012. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/48973.
Council of Science Editors:
Campbell CJ. Trapping, laser cooling, and spectroscopy of Thorium IV. [Doctoral Dissertation]. Georgia Tech; 2012. Available from: http://hdl.handle.net/1853/48973
University of Oxford
8.
Craik, Diana Prado Lopes Aude.
Near-field microwave addressing of trapped-ion qubits for scalable quantum computation.
Degree: PhD, 2016, University of Oxford
URL: https://ora.ox.ac.uk/objects/uuid:7ca0a411-a12f-41d3-ab2b-09025388c462
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.730068
► This thesis reports high-fidelity near-field spatial microwave addressing of long-lived 43Ca+ "atomic clock" qubits performed in a two-zone single-layer surface-electrode ion trap. Addressing is implemented…
(more)
▼ This thesis reports high-fidelity near-field spatial microwave addressing of long-lived 43Ca+ "atomic clock" qubits performed in a two-zone single-layer surface-electrode ion trap. Addressing is implemented by using two of the trap's integrated microwave electrodes, one in each zone, to drive single-qubit rotations in the zone we choose to address whilst interferometrically cancelling the microwave field at the neighbour (non-addressed) zone. Using this field-nulling scheme, we measure a Rabi frequency ratio between addressed and non-addressed zones of up to 1400, from which we calculate an addressing error (or a spin-flip probability on the qubit transition) of 1e-6. Off-resonant excitation out of the qubit state is a more significant source of error in this experiment, but we also demonstrate polarisation control of the microwave field at an error level of 2e-5, which, if combined with individual-ion addressing, would be sufficient to suppress off-resonant excitation errors to the 1e-9 level. Further, this thesis presents preliminary results obtained with a micron-scale coupled-microstrip differential antenna probe that can be scanned over an ion-trap chip to map microwave magnetic near fields. The probe is designed to enable the measurement of fields at tens of microns above electrode surfaces and to act as an effective characterisation tool, speeding up design-fabrication-characterisation cycles in the production of new prototype microwave ion-trap chips. Finally, a new multi-layer design for an ion-trap chip which displays, in simulations, a 100-fold improvement in addressing performance, is presented. The chip electrode structure is designed to use the cancelling effect of microwave return currents to produce Rabi frequency ratios of order 1000 between trap zones using a single microwave electrode (i.e. without the need for nulling fields). If realised, this chip could be used to drive individually addressed single-qubit operations on arrays of memory qubits in parallel and with high fidelity.
Subjects/Keywords: 530.12; Trapped ions; Quantum computation; microwave-driven quantum logic; trapped-ion quantum computing
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APA (6th Edition):
Craik, D. P. L. A. (2016). Near-field microwave addressing of trapped-ion qubits for scalable quantum computation. (Doctoral Dissertation). University of Oxford. Retrieved from https://ora.ox.ac.uk/objects/uuid:7ca0a411-a12f-41d3-ab2b-09025388c462 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.730068
Chicago Manual of Style (16th Edition):
Craik, Diana Prado Lopes Aude. “Near-field microwave addressing of trapped-ion qubits for scalable quantum computation.” 2016. Doctoral Dissertation, University of Oxford. Accessed February 27, 2021.
https://ora.ox.ac.uk/objects/uuid:7ca0a411-a12f-41d3-ab2b-09025388c462 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.730068.
MLA Handbook (7th Edition):
Craik, Diana Prado Lopes Aude. “Near-field microwave addressing of trapped-ion qubits for scalable quantum computation.” 2016. Web. 27 Feb 2021.
Vancouver:
Craik DPLA. Near-field microwave addressing of trapped-ion qubits for scalable quantum computation. [Internet] [Doctoral dissertation]. University of Oxford; 2016. [cited 2021 Feb 27].
Available from: https://ora.ox.ac.uk/objects/uuid:7ca0a411-a12f-41d3-ab2b-09025388c462 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.730068.
Council of Science Editors:
Craik DPLA. Near-field microwave addressing of trapped-ion qubits for scalable quantum computation. [Doctoral Dissertation]. University of Oxford; 2016. Available from: https://ora.ox.ac.uk/objects/uuid:7ca0a411-a12f-41d3-ab2b-09025388c462 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.730068
University of California – Berkeley
9.
Pruttivarasin, Thaned.
Spectroscopy, fundamental symmetry tests and quantum simulation with trapped ions.
Degree: Physics, 2014, University of California – Berkeley
URL: http://www.escholarship.org/uc/item/8km8h4df
► This dissertation reports on precision measurements of the atomic structure of calcium ions (40Ca+), application of trapped 40Ca+ ions as a probe for a violation…
(more)
▼ This dissertation reports on precision measurements of the atomic structure of calcium ions (40Ca+), application of trapped 40Ca+ ions as a probe for a violation of fundamental symmetry and prospects of performing quantum simulations with trapped ion.We demonstrate a novel technique to perform spectroscopy on the dipole transition of 40Ca+ that circumvents usual difficulties from dark resonances and Doppler heating. The center of the atomic transition can be detected to a precision of 200 kHz or less with an integration time of 10 minutes. We apply this method to directly measure the influence of micromotion on the fluorescence spectra and confirm the dependence of the modulation index on the radial trap frequency. We measure the branching fraction of the excited 2P1/2 state of 40Ca+ to be 0.93565(7) using a simple experimental scheme readily applicable to many other ion species. Our result for 40Ca+ distinguishes well among various theoretically calculated values, which is important in guiding further developments of the theoretical work.We apply the Ramsey spectroscopy technique based on a pair of correlated ions to probe the effect of the violation of local Lorentz invariance (LLI). The energy difference between the two components of the Bell state |PsiB> = |mJ=5/2,mJ=-5/2>+|mJ=1/2,mJ=-1/2> in the D5/2 manifold of 40Ca+ is monitored for 12 hours. We found that the energy component related to the violation of LLI varies less than 17±22 mHz. Assuming a hydrogen-like model of 40Ca+, the measurement result provides us the bound of the LLI parameter C(2)0 to be 1.7±2.2x10-17.Based on numerical simulations, we show that the Aubry transition in the Frenkel-Kontorova model with trapped ion can be observed for practical experimental parameters such as the strength and wavelength of the optical lattice, which serves as an external perturbing periodic potential. Moreover, we also show that the normal mode structure of ion chain can change significantly as we vary the strength of the optical lattice.
Subjects/Keywords: Physics; Quantum simulation; Spectroscopy; Symmetry test; Trapped ions
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APA (6th Edition):
Pruttivarasin, T. (2014). Spectroscopy, fundamental symmetry tests and quantum simulation with trapped ions. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/8km8h4df
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):
Pruttivarasin, Thaned. “Spectroscopy, fundamental symmetry tests and quantum simulation with trapped ions.” 2014. Thesis, University of California – Berkeley. Accessed February 27, 2021.
http://www.escholarship.org/uc/item/8km8h4df.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Pruttivarasin, Thaned. “Spectroscopy, fundamental symmetry tests and quantum simulation with trapped ions.” 2014. Web. 27 Feb 2021.
Vancouver:
Pruttivarasin T. Spectroscopy, fundamental symmetry tests and quantum simulation with trapped ions. [Internet] [Thesis]. University of California – Berkeley; 2014. [cited 2021 Feb 27].
Available from: http://www.escholarship.org/uc/item/8km8h4df.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Pruttivarasin T. Spectroscopy, fundamental symmetry tests and quantum simulation with trapped ions. [Thesis]. University of California – Berkeley; 2014. Available from: http://www.escholarship.org/uc/item/8km8h4df
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Waterloo
10.
Bramman, Brendan.
Measuring Trapped Ion Qudits.
Degree: 2019, University of Waterloo
URL: http://hdl.handle.net/10012/15165
► Quantum information has typically focused on using 2-level qubits to perform simulation and computation. We propose to expand the number of levels for computation using…
(more)
▼ Quantum information has typically focused on using 2-level qubits to perform simulation and computation. We propose to expand the number of levels for computation using qudits, where (d>2). Doing so could be a viable option for making trapped ion systems scalable for quantum computation. Our group in particular will use Barium ions because of some energy features and convenient laser wavelengths. This thesis presents much of the necessary background needed to work with Barium as a qudit for quantum computation. Energy structure, branching ratios, and saturation intensities are derived and presented. In addition, a method for selecting different isotopes of Barium for trapping is discussed. A method for measuring out the state of a Barium qudit is presented, with error rates estimated to be under (1%) for up to 5-level qudits. Finally, various optics projects which were necessary for building up our first ion trap are outlined.
Subjects/Keywords: trapped ions; barium; quantum information; quantum computing; measurement; energy
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Bramman, B. (2019). Measuring Trapped Ion Qudits. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/15165
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):
Bramman, Brendan. “Measuring Trapped Ion Qudits.” 2019. Thesis, University of Waterloo. Accessed February 27, 2021.
http://hdl.handle.net/10012/15165.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bramman, Brendan. “Measuring Trapped Ion Qudits.” 2019. Web. 27 Feb 2021.
Vancouver:
Bramman B. Measuring Trapped Ion Qudits. [Internet] [Thesis]. University of Waterloo; 2019. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10012/15165.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bramman B. Measuring Trapped Ion Qudits. [Thesis]. University of Waterloo; 2019. Available from: http://hdl.handle.net/10012/15165
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Oxford
11.
Ballance, Christopher J.
High-fidelity quantum logic in Ca+.
Degree: PhD, 2014, University of Oxford
URL: http://ora.ox.ac.uk/objects/uuid:1beb7f67-4d92-4d57-8754-50f92f9d27f4
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.711720
► Trapped atomic ions are one of the most promising systems for building a quantum computer – all of the fundamental operations needed to build a…
(more)
▼ Trapped atomic ions are one of the most promising systems for building a quantum computer – all of the fundamental operations needed to build a quantum computer have been demonstrated in such systems. The challenge now is to understand and reduce the operation errors to below the 'fault-tolerant threshold' (the level below which quantum error correction works), and to scale up the current few-qubit experiments to many qubits. This thesis describes experimental work concentrated primarily on the first of these challenges. We demonstrate high-fidelity single-qubit and two-qubit (entangling) gates with errors at or below the fault-tolerant threshold. We also implement an entangling gate between two different species of ions, a tool which may be useful for certain scalable architectures. We study the speed/fidelity trade-off for a two-qubit phase gate implemented in 43Ca<sup>+</sup> hyperfine trapped-ion qubits. We develop an error model which describes the fundamental and technical imperfections / limitations that contribute to the measured gate error. We characterize and minimise various error sources contributing to the measured fidelity, allowing us to account for errors due to the single-qubit operations and state readout (each at the 0.1% level), and to identify the leading sources of error in the two-qubit entangling operation. We achieve gate fidelities ranging between 97.1(2)% (for a gate time tg = 3.8 μs) and 99.9(1)% (for tg = 100 μs), representing respectively the fastest and lowest-error two-qubit gates reported between trapped-ion qubits by nearly an order of magnitude in each case. We also characterise single-qubit gates with average errors below 10-4 per operation, over an order of magnitude better than previously achieved with laser-driven operations. Additionally, we present work on a mixed-species entangling gate. We entangle of a single 40Ca<sup>+</sup> ion and a single 43Ca<sup>+</sup> ion with a fidelity of 99.8(5)%, and perform full tomography of the resulting entangled state. We describe how this mixed-species gate mechanism could be used to entangle 43Ca<sup>+</sup> and 88Sr<sup>+</sup>, a promising combination of ions for future experiments.
Subjects/Keywords: 539.7; Trapped ions; Quantum logic; Quantum computers; Fault-tolerant computing
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Ballance, C. J. (2014). High-fidelity quantum logic in Ca+. (Doctoral Dissertation). University of Oxford. Retrieved from http://ora.ox.ac.uk/objects/uuid:1beb7f67-4d92-4d57-8754-50f92f9d27f4 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.711720
Chicago Manual of Style (16th Edition):
Ballance, Christopher J. “High-fidelity quantum logic in Ca+.” 2014. Doctoral Dissertation, University of Oxford. Accessed February 27, 2021.
http://ora.ox.ac.uk/objects/uuid:1beb7f67-4d92-4d57-8754-50f92f9d27f4 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.711720.
MLA Handbook (7th Edition):
Ballance, Christopher J. “High-fidelity quantum logic in Ca+.” 2014. Web. 27 Feb 2021.
Vancouver:
Ballance CJ. High-fidelity quantum logic in Ca+. [Internet] [Doctoral dissertation]. University of Oxford; 2014. [cited 2021 Feb 27].
Available from: http://ora.ox.ac.uk/objects/uuid:1beb7f67-4d92-4d57-8754-50f92f9d27f4 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.711720.
Council of Science Editors:
Ballance CJ. High-fidelity quantum logic in Ca+. [Doctoral Dissertation]. University of Oxford; 2014. Available from: http://ora.ox.ac.uk/objects/uuid:1beb7f67-4d92-4d57-8754-50f92f9d27f4 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.711720
12.
Bentley, Christopher Derek Bartlett.
Fast gates and steady states: entangling trapped ions
.
Degree: 2015, Australian National University
URL: http://hdl.handle.net/1885/104996
► This thesis describes schemes for both a fast two-qubit gate operation and the steady-state preparation of a Bell state with trapped ions. A critical figure…
(more)
▼ This thesis describes schemes for both a fast two-qubit gate
operation and the steady-state preparation of a Bell state with
trapped ions.
A critical figure of merit for quantum computing with trapped
ions is the gate duration relative to the decoherence timescale.
We propose a fast gate scheme that off ers improvements in time,
fidelity and simplicity of implementation over existing fast
gate proposals. Our scheme can operate on both neighbouring and
non-neighbouring ions in a long ion crystal. This provides a
simpler and faster mechanism than traditional gates for complex
quantum computing operations on large numbers of ions. The scheme
achieves
fidelities well above quantum error correction
thresholds around 0.0001, and operates arbitrarily fast given
arbitrary laser repetition rates. The production of these
ultra-fast pulses is an experimental challenge, and fast gates
have not yet been implemented; we present an implementation
scheme using pulse splitting to provide a higher repetition rate
and the pulse timing freedoms required for the gate scheme. We
also analyse the effects of errors
in the pulses on the gate operation.
We analyse another strategy to generate entanglement using a
driven dissipative process. Typically, environmental couplings
cause decoherence. However, by combining dissipative dynamics
with suitably chosen Hamiltonian evolution, the system can be
steered to the desired steady states. Our steady-state scheme
prepares a maximally-entangled Bell state with fidelity above
0.99, much higher than for schemes implemented with trapped ions.
The driven dissipation continuously pumps the system towards the
antisymmetric Bell steady-state, which is dark to the system
dynamics and robust to parameter variations. The dominant loss
mechanism is anomalous heating of the motional modes, reducing
our fidelity by less than 0.01 for current experimental rates.
Our scheme jointly addresses the ions and does not use
sympathetic cooling. We enhance our scheme by combining the
dissipative state preparation with the detection of photons, and
obtain a significant fidelity enhancement.
Subjects/Keywords: Quantum information processing;
fast gates;
trapped ions;
quantum computing;
quantum logic
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APA ·
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MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Bentley, C. D. B. (2015). Fast gates and steady states: entangling trapped ions
. (Thesis). Australian National University. Retrieved from http://hdl.handle.net/1885/104996
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):
Bentley, Christopher Derek Bartlett. “Fast gates and steady states: entangling trapped ions
.” 2015. Thesis, Australian National University. Accessed February 27, 2021.
http://hdl.handle.net/1885/104996.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bentley, Christopher Derek Bartlett. “Fast gates and steady states: entangling trapped ions
.” 2015. Web. 27 Feb 2021.
Vancouver:
Bentley CDB. Fast gates and steady states: entangling trapped ions
. [Internet] [Thesis]. Australian National University; 2015. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1885/104996.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bentley CDB. Fast gates and steady states: entangling trapped ions
. [Thesis]. Australian National University; 2015. Available from: http://hdl.handle.net/1885/104996
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Duke University
13.
Crain, Stephen Gregory.
Integrated System Technologies for Modular Trapped Ion Quantum Information Processing
.
Degree: 2016, Duke University
URL: http://hdl.handle.net/10161/12270
► Although trapped ion technology is well-suited for quantum information science, scalability of the system remains one of the main challenges. One of the challenges associated…
(more)
▼ Although
trapped ion technology is well-suited for quantum information science, scalability of the system remains one of the main challenges. One of the challenges associated with scaling the ion trap quantum computer is the ability to individually manipulate the increasing number of qubits. Using micro-mirrors fabricated with micro-electromechanical systems (MEMS) technology, laser beams are focused on individual
ions in a linear chain and steer the focal point in two dimensions. Multiple single qubit gates are demonstrated on
trapped 171Yb+ qubits and the gate performance is characterized using quantum state tomography. The system features negligible crosstalk to neighboring
ions (< 3e-4), and switching speeds comparable to typical single qubit gate times (< 2 us). In a separate experiment, photons scattered from the 171Yb+ ion are coupled into an optical fiber with 63% efficiency using a high numerical aperture lens (0.6 NA). The coupled photons are directed to superconducting nanowire single photon detectors (SNSPD), which provide a higher detector efficiency (69%) compared to traditional photomultiplier tubes (35%). The total system photon collection efficiency is increased from 2.2% to 3.4%, which allows for fast state detection of the qubit. For a detection beam intensity of 11 mW/cm2, the average detection time is 23.7 us with 99.885(7)% detection fidelity. The technologies demonstrated in this thesis can be integrated to form a single quantum register with all of the necessary resources to perform local gates as well as high fidelity readout and provide a photon link to other systems.
Advisors/Committee Members: Kim, Jungsang (advisor).
Subjects/Keywords: Electrical engineering;
MEMS;
Optics;
Quantum information science;
trapped ions
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APA ·
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Export
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Manager
APA (6th Edition):
Crain, S. G. (2016). Integrated System Technologies for Modular Trapped Ion Quantum Information Processing
. (Thesis). Duke University. Retrieved from http://hdl.handle.net/10161/12270
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):
Crain, Stephen Gregory. “Integrated System Technologies for Modular Trapped Ion Quantum Information Processing
.” 2016. Thesis, Duke University. Accessed February 27, 2021.
http://hdl.handle.net/10161/12270.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Crain, Stephen Gregory. “Integrated System Technologies for Modular Trapped Ion Quantum Information Processing
.” 2016. Web. 27 Feb 2021.
Vancouver:
Crain SG. Integrated System Technologies for Modular Trapped Ion Quantum Information Processing
. [Internet] [Thesis]. Duke University; 2016. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10161/12270.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Crain SG. Integrated System Technologies for Modular Trapped Ion Quantum Information Processing
. [Thesis]. Duke University; 2016. Available from: http://hdl.handle.net/10161/12270
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Sydney
14.
Sastrawan, Wayan Jarrah Scheeres.
Novel precision control techniques in a trapped Yb+ ion implementation
.
Degree: 2015, University of Sydney
URL: http://hdl.handle.net/2123/13534
► Precise control of quantum systems is vital to scientific and technological progress, including the realisation of quantum computation and simulation, record-breaking timekeeping and positioning applications.…
(more)
▼ Precise control of quantum systems is vital to scientific and technological progress, including the realisation of quantum computation and simulation, record-breaking timekeeping and positioning applications. Control of quantum systems is hampered by the effects of random environmental or hardware noise, which leads to unknown deviations from the system's desired evolution. This thesis presents a set of interaction-focussed methods for improving precision control, tailored to the problems of quantum error suppression and stabilisation of oscillators, which share a common basic structure. These methods are based on a theoretical framework called the filter-transfer function formalism, which expresses the convolution of user-applied control and random noise in the language of spectral filtering. This powerful and accessible approach is experimentally verified in this thesis, and is used to formulate novel control techniques and improve on existing ones. This thesis experimentally demonstrates the effectiveness of novel composite pulse schemes for suppressing error in quantum bits. Furthermore, the thesis derives and demonstrates a novel predictive technique for stabilising oscillators by means of combining multiple frequency measurements against a quantum reference. The thesis therefore advances the theoretical understanding of a frequency-domain formalism for noise-affected quantum systems, on which basis it presents and demonstrates novel and improved techniques for mitigating the effects of such noise on the user's precision control over the system.
Subjects/Keywords: quantum control;
trapped ions;
atomic clock;
frequency standard
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APA ·
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Export
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Manager
APA (6th Edition):
Sastrawan, W. J. S. (2015). Novel precision control techniques in a trapped Yb+ ion implementation
. (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/13534
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):
Sastrawan, Wayan Jarrah Scheeres. “Novel precision control techniques in a trapped Yb+ ion implementation
.” 2015. Thesis, University of Sydney. Accessed February 27, 2021.
http://hdl.handle.net/2123/13534.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sastrawan, Wayan Jarrah Scheeres. “Novel precision control techniques in a trapped Yb+ ion implementation
.” 2015. Web. 27 Feb 2021.
Vancouver:
Sastrawan WJS. Novel precision control techniques in a trapped Yb+ ion implementation
. [Internet] [Thesis]. University of Sydney; 2015. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/2123/13534.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sastrawan WJS. Novel precision control techniques in a trapped Yb+ ion implementation
. [Thesis]. University of Sydney; 2015. Available from: http://hdl.handle.net/2123/13534
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Michigan State University
15.
Barquest, Bradley Ryan.
An advanced ion guide for beam cooling and bunching for collinear laser spectroscopy of rare isotopes.
Degree: 2014, Michigan State University
URL: http://etd.lib.msu.edu/islandora/object/etd:2965
► Thesis Ph. D. Michigan State University. Physics 2014.
A next generation beam cooler and buncher has been developed and commissioned at NSCL to provide bunched,…
(more)
▼ Thesis Ph. D. Michigan State University. Physics 2014.
A next generation beam cooler and buncher has been developed and commissioned at NSCL to provide bunched, low energy spread ion beams for collinear laser spectroscopy of rare isotopes. Low energy spread beams reduce the Doppler broadening observed in the fluorescence spectrum, thus improving the resolution achievable in a measurement. Bunched beams permit the reduction of background in fluorescence spectra, thus dramatically improving the signal to noise ratio of the measurement. The beam cooler and buncher features a novel electrode design intended to simplify construction and maintenance, as well as permit the use of large radiofrequency (RF) amplitudes for more efficient beam cooling, especially in the case of high beam currents. A series of ion optical simulations were carried out to determine the design parameters and anticipated bunched beam characteristics. Additional studies using a prototype electrode structure and ion guide system were undertaken to test the performance of the proposed design. The ion guide also serves as a component of the NSCL gas stopping facility. Based on the results of simulation, prototype and ion guide test results, the BECOLA beam cooler and buncher was developed and commissioned. Buncher efficiency, bunched beam energy spread, time width, and transverse emittance were measured using a stable ion source. In addition, the BECOLA collinear laser spectroscopy facility and the beam cooler and buncher were commissioned using a beam of the rare isotope 37K. The results of ion optical simulations, prototype tests, ion guide studies, and BECOLA cooler and buncher characterization measurements are presented and discussed. The results indicate a successful commissioning of the beam cooler and buncher, along with the rest of the BECOLA facility, with a rare isotope beam, and the systematic studies indicate efficient delivery of low emittance, low energy spread bunched beams well suited for collinear laser spectroscopy.
Description based on online resource; title from PDF t.p. (ProQuest, viewed on Sept. 16, 2014).
Advisors/Committee Members: Bollen, Georg, Mantica, Paul F, Leitner, Daniela, Hjorth-Jensen, Morten, Tollefson, Kirsten.
Subjects/Keywords: Laser spectroscopy; Trapped ions; Fluorescence spectroscopy; Nuclear physics
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APA ·
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MLA ·
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Manager
APA (6th Edition):
Barquest, B. R. (2014). An advanced ion guide for beam cooling and bunching for collinear laser spectroscopy of rare isotopes. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:2965
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):
Barquest, Bradley Ryan. “An advanced ion guide for beam cooling and bunching for collinear laser spectroscopy of rare isotopes.” 2014. Thesis, Michigan State University. Accessed February 27, 2021.
http://etd.lib.msu.edu/islandora/object/etd:2965.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Barquest, Bradley Ryan. “An advanced ion guide for beam cooling and bunching for collinear laser spectroscopy of rare isotopes.” 2014. Web. 27 Feb 2021.
Vancouver:
Barquest BR. An advanced ion guide for beam cooling and bunching for collinear laser spectroscopy of rare isotopes. [Internet] [Thesis]. Michigan State University; 2014. [cited 2021 Feb 27].
Available from: http://etd.lib.msu.edu/islandora/object/etd:2965.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Barquest BR. An advanced ion guide for beam cooling and bunching for collinear laser spectroscopy of rare isotopes. [Thesis]. Michigan State University; 2014. Available from: http://etd.lib.msu.edu/islandora/object/etd:2965
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Michigan State University
16.
Kittimanapun, Kritsada.
Investigation of ion capture in an electron beam ion trap charge-breeder for rare isotopes.
Degree: 2014, Michigan State University
URL: http://etd.lib.msu.edu/islandora/object/etd:3092
► Thesis Ph. D. Michigan State University. Physics - Doctor of Philosophy 2014.
Charge breeding of rare isotope ions has become an important ingredient for providing…
(more)
▼ Thesis Ph. D. Michigan State University. Physics - Doctor of Philosophy 2014.
Charge breeding of rare isotope ions has become an important ingredient for providing reaccelerated rare isotope beams for science. At the National Superconducting Cyclotron Laboratory (NSCL), a reaccelerator, ReA, has been built that employs an advanced Electron Beam Ion Trap (EBIT) as a charge breeder. ReA will provide rare-isotope beams with energies of a few hundred keV/u up to tens of MeV/u to enable the study of properties of rare isotopes via low energy Coulomb excitation and transfer reactions, and to investigate nuclear reactions important for nuclear astrophysics. ReA consists of an EBIT charge breeder, a charge-over-mass selector, a room temperature radio-frequency quadrupole accelerator, and a superconducting radio-frequency linear accelerator. The EBIT charge breeder features a high-current electron gun, a long trap structure, and a hybrid superconducting magnet to reach both high acceptance for injected low-charge ions as well as high-electron beam current densities for fast charge breeding.In this work, continuous ion injection and capture in the EBIT have been investigated with a dedicated Monte-Carlo simulation code and in experimental studies. The Monte-Carlo code NEBIT considers the electron-impact ionization cross sections, space charge due to the electron beam current, ion dynamics, electric field from electrodes, and magnetic field from the superconducting magnet. Experiments were performed to study the capture efficiency as a function of injected ion beam current, electron beam current, trap size, and trap potential depth. The charge state evolution of trapped ions was studied, providing information about the effective current density of the electron beam inside the EBIT. An attempt was made to measure the effective space-charge potential of the electron beam by studying the dynamics of a beam injected and reflected inside the trap.
Description based on online resource; title from PDF t.p. (viewed on May 1, 2017)
Advisors/Committee Members: Bollen, Georg, Leitner, Daniela, Schwarz, Stefan, Zelevinsky, Vladimir G, Birge, Norman O.
Subjects/Keywords: Electron beams; Trapped ions; Isotopes; Exotic nuclei – Research; Physics
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APA (6th Edition):
Kittimanapun, K. (2014). Investigation of ion capture in an electron beam ion trap charge-breeder for rare isotopes. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:3092
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):
Kittimanapun, Kritsada. “Investigation of ion capture in an electron beam ion trap charge-breeder for rare isotopes.” 2014. Thesis, Michigan State University. Accessed February 27, 2021.
http://etd.lib.msu.edu/islandora/object/etd:3092.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kittimanapun, Kritsada. “Investigation of ion capture in an electron beam ion trap charge-breeder for rare isotopes.” 2014. Web. 27 Feb 2021.
Vancouver:
Kittimanapun K. Investigation of ion capture in an electron beam ion trap charge-breeder for rare isotopes. [Internet] [Thesis]. Michigan State University; 2014. [cited 2021 Feb 27].
Available from: http://etd.lib.msu.edu/islandora/object/etd:3092.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kittimanapun K. Investigation of ion capture in an electron beam ion trap charge-breeder for rare isotopes. [Thesis]. Michigan State University; 2014. Available from: http://etd.lib.msu.edu/islandora/object/etd:3092
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of California – Berkeley
17.
Moeller, Soenke Alexander.
How to couple trapped ions to superconducting resonators: towards hybrid quantum devices.
Degree: Physics, 2016, University of California – Berkeley
URL: http://www.escholarship.org/uc/item/2nv876dw
► In this dissertation, we present work on a quantum hybrid device comprising of a trapped calcium atom and a superconducting LC resonator. This hybrid device…
(more)
▼ In this dissertation, we present work on a quantum hybrid device comprising of a trapped calcium atom and a superconducting LC resonator. This hybrid device is a first step towards building a hybrid quantum computer that can take advantage of the different properties of atomic and superconducting quantum systems and combine the best characteristics of both. We model a trapped ion as an LC circuit and calculate its coupling to a mode of an LC resonator. Further, we optimize the trap geometry and placement of coupling electrodes to increase the coupling. We also outline the manufacturing process and simulation of the trapping potentials for the surface traps used in this work. Finally, we report on initial experiments coupling a trapped ion to a resonant mode of the LC resonator, increasing the heating rate to 220 phonons/ms on resonance versus 0.5 phonons/ms without additional heating from the resonator. The ratio of the heating rates for the two secular frequencies of the ion confrm our simulated coupling rates.
Subjects/Keywords: Quantum physics; Atomic physics; quantum information processing; qubit; superconducting qubit; trapped ions
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APA (6th Edition):
Moeller, S. A. (2016). How to couple trapped ions to superconducting resonators: towards hybrid quantum devices. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/2nv876dw
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):
Moeller, Soenke Alexander. “How to couple trapped ions to superconducting resonators: towards hybrid quantum devices.” 2016. Thesis, University of California – Berkeley. Accessed February 27, 2021.
http://www.escholarship.org/uc/item/2nv876dw.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Moeller, Soenke Alexander. “How to couple trapped ions to superconducting resonators: towards hybrid quantum devices.” 2016. Web. 27 Feb 2021.
Vancouver:
Moeller SA. How to couple trapped ions to superconducting resonators: towards hybrid quantum devices. [Internet] [Thesis]. University of California – Berkeley; 2016. [cited 2021 Feb 27].
Available from: http://www.escholarship.org/uc/item/2nv876dw.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Moeller SA. How to couple trapped ions to superconducting resonators: towards hybrid quantum devices. [Thesis]. University of California – Berkeley; 2016. Available from: http://www.escholarship.org/uc/item/2nv876dw
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Stellenbosch University
18.
Van den Worm, Mauritz.
Dynamics of long-range interacting quantum spin systems.
Degree: PhD, Physics, 2015, Stellenbosch University
URL: http://hdl.handle.net/10019.1/97772
► ENGLISH ABSTRACT: In this thesis we study the time evolution of correlation functions in quantum lattice models in the presence of long-range interactions or hopping…
(more)
▼ ENGLISH ABSTRACT: In this thesis we study the time evolution of correlation functions in quantum
lattice models in the presence of long-range interactions or hopping decaying
asymptotically as a power law. For a large class of initial conditions,
exact analytic results are obtained in arbitrary lattice dimension for the longrange
Ising model. In contrast to the nearest-neighbour case, we find that
correlations decay like stretched or compressed exponentials in time. Provided
the long-range character of the interactions is sufficiently strong, pronounced
prethermalization plateaus are observed and relaxation timescales are widely
separated. Starting from uncorrelated states that are easily prepared in experiments,
we show the dynamical emergence of correlations and entanglement
in these far-from-equilibrium interacting quantum systems. We characterize
these correlations by the entanglement entropy, concurrence, and squeezing,
which are inequivalent measures of entanglement corresponding to different
quantum resources.
For interaction exponents larger than the lattice dimensionality, a Lieb-
Robinson-type bound effectively restricts the spreading of correlations to the
interior of a causal region, but allows supersonic (faster than linear) propagation.
Using tools of quantum metrology, for any exponents smaller than the
lattice dimension, we construct Hamiltonians giving rise to quantum channels
with capacities not restricted to any causal region. An analytic analysis of
long-range Ising models illustrates the disappearance of the causal region and
the creation of correlations becoming distance-independent. In all models we
analyzed the spreading of correlations follows a power law, and not the exponential
increase of the long-range Lieb-Robinson bound. Lieb-Robinson-type
bounds are extended to strongly long-range interactions where the interaction
exponent is smaller than the lattice dimension, and we report particularly
sharp bounds that are capable of reproducing regimes with soundcone
as well as supersonic dynamics. Our results provide guidance for optimizing
experimental efforts to harness long-range interactions in a variety of quantum
information and signaling tasks.
AFRIKAANSE OPSOMMING: In hierdie tesis studeer ons die tydevolusie van korrelasiefunksies in kwantumroostermodelle
in die teenwoordigheid van lang-afstand interaksies of spronge
wat asimptoties in `n magswet verval. Vir `n groot versameling begintoestande
word presiese analitiese resultate vir die lang-afstand-Ising-model verkry. In
teenstelling met die naaste-naasliggende-interaksie-Ising-model vind ons dat
korrelasies soos uitgerekte of saamgepersde eksponentiele funksies in tyd verval.
Indien die lang-afstand gedrag van die interaksies lank genoeg is word
lanklewende kwasi-stationere toestande gevorm as gevolg van wyd verspreide
tydskale wat in die ontspanningsgedrag van die korrelasiefunksies voorkom.
Wanneer ongekorreleerde begintoestande, wat eenvoudig in die laboratorium
voorberei kan word, gebruik…
Advisors/Committee Members: Kastner, M., Stellenbosch University. Faculty of Science. Dept. of Physics..
Subjects/Keywords: Long-range interactions; Lieb-Robinson Bounds; Trapped ions; Equilibration; Thermalization; Non equilibrium dynamics; UCTD
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APA (6th Edition):
Van den Worm, M. (2015). Dynamics of long-range interacting quantum spin systems. (Doctoral Dissertation). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/97772
Chicago Manual of Style (16th Edition):
Van den Worm, Mauritz. “Dynamics of long-range interacting quantum spin systems.” 2015. Doctoral Dissertation, Stellenbosch University. Accessed February 27, 2021.
http://hdl.handle.net/10019.1/97772.
MLA Handbook (7th Edition):
Van den Worm, Mauritz. “Dynamics of long-range interacting quantum spin systems.” 2015. Web. 27 Feb 2021.
Vancouver:
Van den Worm M. Dynamics of long-range interacting quantum spin systems. [Internet] [Doctoral dissertation]. Stellenbosch University; 2015. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10019.1/97772.
Council of Science Editors:
Van den Worm M. Dynamics of long-range interacting quantum spin systems. [Doctoral Dissertation]. Stellenbosch University; 2015. Available from: http://hdl.handle.net/10019.1/97772
University of Colorado
19.
Grau, Matt.
Measuring the Electron Electric Dipole Moment with Trapped Molecular Ions.
Degree: PhD, Physics, 2015, University of Colorado
URL: https://scholar.colorado.edu/phys_gradetds/160
► An electron electric dipole moment (eEDM) directly violates time-reversal symmetry, a fact which has far reaching implications for physics beyond the Standard Model. An…
(more)
▼ An electron electric dipole moment (eEDM) directly violates time-reversal symmetry, a fact which has far reaching implications for physics beyond the Standard Model. An experiment using
trapped molecular
ions offers high sensitivity because of the large effective electric fields and long coherence times that are possible. We demonstrate precision spectroscopy on many
trapped HfF+
ions in a radiofrequency quadrupole trap with rotating electric and magnetic fields. The spectroscopy performed is a Ramsey type experiment between spin states of the metastable
3∆
1 electronic state and has a coherence time exceeding 1 second. We have collected and analyzed over 200 hours of Ramsey spectroscopy data taken under a variety of experimental conditions. We identify several systematic errors that could potentially affect an eEDM measurement and estimate the size of these interloping effects. By collecting data under pairs of conditions where the eEDM has opposing signs (e.g. performing Ramsey spectroscopy on the two Λ-doublets) we are able to take frequency differences that can suppress some of these systematic effects. Although our data set includes runs where we have intentionally varied experimental parameters to study systematic effects, we achieve a 1σ statistical sensitivity of 2.76 × 10
−28 e·cm and place a 1σ upper bound on the size of systematic effects of 2.82 × 10
−28 e·cm. Finally we present a preliminary upper bound on the eEDM of |d
e| < 4.6 × 10
−28 e·cm with 90% confidence.
Advisors/Committee Members: Eric A. Cornell, Jun Ye, John L. Bohn, James K. Thompson, Mathias Weber.
Subjects/Keywords: electron electric dipole moment; precision measurement; trapped ions; Atomic, Molecular and Optical Physics
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APA (6th Edition):
Grau, M. (2015). Measuring the Electron Electric Dipole Moment with Trapped Molecular Ions. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/phys_gradetds/160
Chicago Manual of Style (16th Edition):
Grau, Matt. “Measuring the Electron Electric Dipole Moment with Trapped Molecular Ions.” 2015. Doctoral Dissertation, University of Colorado. Accessed February 27, 2021.
https://scholar.colorado.edu/phys_gradetds/160.
MLA Handbook (7th Edition):
Grau, Matt. “Measuring the Electron Electric Dipole Moment with Trapped Molecular Ions.” 2015. Web. 27 Feb 2021.
Vancouver:
Grau M. Measuring the Electron Electric Dipole Moment with Trapped Molecular Ions. [Internet] [Doctoral dissertation]. University of Colorado; 2015. [cited 2021 Feb 27].
Available from: https://scholar.colorado.edu/phys_gradetds/160.
Council of Science Editors:
Grau M. Measuring the Electron Electric Dipole Moment with Trapped Molecular Ions. [Doctoral Dissertation]. University of Colorado; 2015. Available from: https://scholar.colorado.edu/phys_gradetds/160
University of Washington
20.
Lilieholm, Jennifer Flora.
Experiments with Trapped Ions: Entanglement, Novel Traps, and Quantum Jumps.
Degree: PhD, 2020, University of Washington
URL: http://hdl.handle.net/1773/46547
► Quantum computing promises to revolutionize modern computation. The race to establish a reliable quantum computing system has spurred research over the globe with the goal…
(more)
▼ Quantum computing promises to revolutionize modern computation. The race to establish a reliable quantum computing system has spurred research over the globe with the goal of establishing a reliable qubit system. One of the more promising candidates are
trapped ions. To that end, I have characterized, improved, and designed experiments to be performed in a novel parabolic mirror ion trap. We measured the trap to have a light collection efficiency of 39%, nearly an order of magnitude higher than the light collection of ion traps utilizing standard collection optics. The parabolic mirror also improves the quality of image collected from a
trapped ion, but is limited by the micromotion the ion undergoes while at the optical focus. We designed a new trap component to allow radial control over the ion position by moving the RF null, instead of displacing it with DC bias plates. This improved trapping system is a key part of our plan to to remotely entangle an In donor defect in ZnO with a single
trapped Yb+ using a 369 nm photon bus. The lifetime of the relevant ionic state is longer than that of the ZnO system by a factor of 6, leading to a greatly decreased temporal overlap in their emitted photons and thus decreased fidelity in the final entangled state if left unattended. This temporal mismatch is a long outstanding challenge when entangling disparate quantum systems, and to address it I performed numerical calculations to design an excitation pulse which can shape the emitted In photon to have an overlap of 0.99 with the Yb+ photon. This leads to a calculated entangled state fidelity of 94% and an entangled state generation rate of 21 kHz with reasonable experimental parameters. Future directions of the parabolic mirror project are the construction of an ellipsoidal mirror trap which is expected to collect light from 95% of the solid angle surrounding a
trapped ion. This high light collection will enable investigations into the time dynamics of quantum jumps. These jumps occur when a weakly driven system is continuously measured, and their appearance is entirely random. However, recent work in an artificial superconducting atom suggests that there is a latency period in other transitions which precedes a jump, allowing for these events to be 'caught'. We endeavor to confirm this behavior in a
trapped ion, confirming the discovery for a real atomic system.
Advisors/Committee Members: Blinov, Boris B (advisor).
Subjects/Keywords: Entanglement; Hybrid quantum systems; Ion trap; Quantum jumps; Trapped ions; Physics; Physics
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APA (6th Edition):
Lilieholm, J. F. (2020). Experiments with Trapped Ions: Entanglement, Novel Traps, and Quantum Jumps. (Doctoral Dissertation). University of Washington. Retrieved from http://hdl.handle.net/1773/46547
Chicago Manual of Style (16th Edition):
Lilieholm, Jennifer Flora. “Experiments with Trapped Ions: Entanglement, Novel Traps, and Quantum Jumps.” 2020. Doctoral Dissertation, University of Washington. Accessed February 27, 2021.
http://hdl.handle.net/1773/46547.
MLA Handbook (7th Edition):
Lilieholm, Jennifer Flora. “Experiments with Trapped Ions: Entanglement, Novel Traps, and Quantum Jumps.” 2020. Web. 27 Feb 2021.
Vancouver:
Lilieholm JF. Experiments with Trapped Ions: Entanglement, Novel Traps, and Quantum Jumps. [Internet] [Doctoral dissertation]. University of Washington; 2020. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1773/46547.
Council of Science Editors:
Lilieholm JF. Experiments with Trapped Ions: Entanglement, Novel Traps, and Quantum Jumps. [Doctoral Dissertation]. University of Washington; 2020. Available from: http://hdl.handle.net/1773/46547
Michigan State University
21.
Gavartin, Emanuel.
Acceptance calculations for a charge breeder based on an Electron Beam Ion Trap.
Degree: MS, Department of Physics, 2008, Michigan State University
URL: http://etd.lib.msu.edu/islandora/object/etd:39267
► "The capture of ions in an Electron Beam Ion Trap has been modelled by calculating single ion trajectories and using Monte Carlo techniques to simulate…
(more)
▼ "The capture of ions in an Electron Beam Ion Trap has been modelled by calculating single ion trajectories and using Monte Carlo techniques to simulate the charge state evolution. By systematically changing the initial conditions of the ion, acceptance of the Electron Beam Ion Trap as a function of the emittance of the injected ion beam has been determined. Different Electron Beam Ion Trap configurations have been studied with the goal to find systems offering both high acceptance and short breeding times into the highest charge states. The results will be used in the design of an Electron Beam Ion Trap charge breeder which will be the first stage of a reaccelerator for rare isotope beams presently under construction at the National Superconducting Cyclotron Laboratory (NSCL)" – Abstract.
Subjects/Keywords: Electron beams; Trapped ions; Ion bombardment
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APA (6th Edition):
Gavartin, E. (2008). Acceptance calculations for a charge breeder based on an Electron Beam Ion Trap. (Masters Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:39267
Chicago Manual of Style (16th Edition):
Gavartin, Emanuel. “Acceptance calculations for a charge breeder based on an Electron Beam Ion Trap.” 2008. Masters Thesis, Michigan State University. Accessed February 27, 2021.
http://etd.lib.msu.edu/islandora/object/etd:39267.
MLA Handbook (7th Edition):
Gavartin, Emanuel. “Acceptance calculations for a charge breeder based on an Electron Beam Ion Trap.” 2008. Web. 27 Feb 2021.
Vancouver:
Gavartin E. Acceptance calculations for a charge breeder based on an Electron Beam Ion Trap. [Internet] [Masters thesis]. Michigan State University; 2008. [cited 2021 Feb 27].
Available from: http://etd.lib.msu.edu/islandora/object/etd:39267.
Council of Science Editors:
Gavartin E. Acceptance calculations for a charge breeder based on an Electron Beam Ion Trap. [Masters Thesis]. Michigan State University; 2008. Available from: http://etd.lib.msu.edu/islandora/object/etd:39267
University of Maryland
22.
Hayes, David Lee.
Remote and Local Entanglement of Ions using Photons and Phonons.
Degree: Physics, 2012, University of Maryland
URL: http://hdl.handle.net/1903/13842
► The scaling of controlled quantum systems to large numbers of degrees of freedom is one of the long term goals of experimental quantum information science.…
(more)
▼ The scaling of controlled quantum systems to large numbers of degrees of freedom is one of the long term goals of experimental quantum information science.
Trapped-ion systems are one of the most promising platforms for building a quantum information processor with enough complexity to enable novel computational power, but face serious challenges in scaling up to the necessary numbers of qubits. In this thesis, I present both technical and operational advancements in the control of
trapped-ion systems and their juxtaposition with photonic modes used for quantum networking. After reviewing the basic physics behind ion trapping, I then describe in detail a new method of implementing Raman transitions in atomic systems using optical frequency combs. Several dierent experimental setups along with simple theoretical models are reviewed and the system is shown to be capable of full control of the qubit-oscillator system. Two-ion entangling operations using optical frequency combs are demonstrated along with an extension of the operation designed to suppress certain experimental errors. I then give an overview of how spatially separated
ions can be entangled using a photonic interconnect. Experimental results show that pulsed excitation of
trapped ions provide an excellent single photon source that can be used as a heralded entangling gate between macroscopically separated systems. This heralded entangling gate is used to show a violation of a Bell inequality while keeping the detection loophole closed and can be used a source private random numbers. Finally, the coherent Coulomb force-based gates are combined with the probabilistic photon-based gates in a proof of concept experiment that shows the feasibility of a distributed ion-photon network.
Advisors/Committee Members: Monroe, Christopher R. (advisor).
Subjects/Keywords: Quantum physics; Atomic physics; Dynamically Corrected Gates; Raman Transitions; Trapped Ions; Walsh Functions
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APA (6th Edition):
Hayes, D. L. (2012). Remote and Local Entanglement of Ions using Photons and Phonons. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/13842
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):
Hayes, David Lee. “Remote and Local Entanglement of Ions using Photons and Phonons.” 2012. Thesis, University of Maryland. Accessed February 27, 2021.
http://hdl.handle.net/1903/13842.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hayes, David Lee. “Remote and Local Entanglement of Ions using Photons and Phonons.” 2012. Web. 27 Feb 2021.
Vancouver:
Hayes DL. Remote and Local Entanglement of Ions using Photons and Phonons. [Internet] [Thesis]. University of Maryland; 2012. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1903/13842.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hayes DL. Remote and Local Entanglement of Ions using Photons and Phonons. [Thesis]. University of Maryland; 2012. Available from: http://hdl.handle.net/1903/13842
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Waterloo
23.
Greenberg, Noah.
Vacuum and Optical Designs for an Open-access Trapped Ion Quantum Processor.
Degree: 2020, University of Waterloo
URL: http://hdl.handle.net/10012/16334
► This thesis focuses on the design of a vacuum system for a trapped ion quantum computer that will house an advanced ion chip trap from…
(more)
▼ This thesis focuses on the design of a vacuum system for a trapped ion quantum computer that will house an advanced ion chip trap from Sandia National Laboratories, capable of performing high fidelity operations on up to tens of qubits. The thesis will outline the different design considerations, criteria, and serve to document the final design choices, in addition to optical design work that will be used to drive resonant atomic transitions in the qubit of choice, 133Ba+, as well as the qudit, 137Ba+.
Subjects/Keywords: physics; ion trapping; quantum computing; open access; quantum simulation; trapped ions; barium
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APA (6th Edition):
Greenberg, N. (2020). Vacuum and Optical Designs for an Open-access Trapped Ion Quantum Processor. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/16334
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):
Greenberg, Noah. “Vacuum and Optical Designs for an Open-access Trapped Ion Quantum Processor.” 2020. Thesis, University of Waterloo. Accessed February 27, 2021.
http://hdl.handle.net/10012/16334.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Greenberg, Noah. “Vacuum and Optical Designs for an Open-access Trapped Ion Quantum Processor.” 2020. Web. 27 Feb 2021.
Vancouver:
Greenberg N. Vacuum and Optical Designs for an Open-access Trapped Ion Quantum Processor. [Internet] [Thesis]. University of Waterloo; 2020. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10012/16334.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Greenberg N. Vacuum and Optical Designs for an Open-access Trapped Ion Quantum Processor. [Thesis]. University of Waterloo; 2020. Available from: http://hdl.handle.net/10012/16334
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
24.
Teizen, Victor Fernandes.
Engenharia da máquina de Stirling em armadilhas iônicas e protocolo de medida da função de distribuição de trabalho.
Degree: Mestrado, Física Básica, 2014, University of São Paulo
URL: http://www.teses.usp.br/teses/disponiveis/76/76131/tde-23042014-164204/
;
► As ligações entre a termodinâmica e a mecânica quântica mostram-se interessantes tópicos de pesquisa desde os anos 50 e tem atraído cada vez mais atenção…
(more)
▼ As ligações entre a termodinâmica e a mecânica quântica mostram-se interessantes tópicos de pesquisa desde os anos 50 e tem atraído cada vez mais atenção nos últimos anos, tanto por suas possíveis aplicações tecnológicas, quanto pelo aspecto teórico - como, por exemplo, as relações de sistemas quânticos com a segunda lei da termodinâmica. Para sistemas quânticos mesoscópicos, restritos apenas a um número relativamente pequeno de estados energéticos, torna-se necessária uma generalização da termodinâmica usual. Neste trabalho mostramos como construir uma máquina de Stirling no contexto de íons aprisionados. Para isso, faz-se necessária a engenharia de frequências dependentes do tempo do modo vibracional do íon, além da engenharia de reservatórios térmicos com temperaturas controladas. Após a construção da máquina de Stirling e do cálculo do trabalho e da eficiência associados apresentamos um protocolo para a medida da função de distribuição do trabalho que recorre às medidas dos níveis de energia eletrônicos do íon para, a partir dessas, extrair-se informação sobre o seu estado vibracional.
The connections between quantum mechanics and thermodynamics have been an interesting research topic since the 1950´s and began attracting more and more attention recently, not only for the technological applications, but also from a theoretical point of view - as, for instance, when dealing with the relations between quantum systems and the second law of thermodynamics. For mesoscopic (or even macroscopic) quantum systems, restricted to relatively few energy states, a generalization of the usual thermodynamics becomes necessary. In the present work we show how to engeneer a Stirling engine in an ionic trap. To achieve this we have to engeneer an ionic vibrational mode with a time dependent frequency, and simutaneously engeneer a thermal reservoir with controled temperatures. After the construction of the Stirling machine and the calculation of the associated work and efficiency, we show a protocol that allows the measurement of the work distribution function which call on the measurement of the electronic energy levels of the ion and, from them, extract information about the vibrational state of the trap.
Advisors/Committee Members: Moussa, Miled Hassan Youssef.
Subjects/Keywords: Armadilhas de ions; Engenharia de reservatórios; Igualdade de Jarzynski; Jarzynski equality; Quantum thermodynamics; Reservoir engeneering; Termodinâmica quântica; Trapped ions
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APA (6th Edition):
Teizen, V. F. (2014). Engenharia da máquina de Stirling em armadilhas iônicas e protocolo de medida da função de distribuição de trabalho. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/76/76131/tde-23042014-164204/ ;
Chicago Manual of Style (16th Edition):
Teizen, Victor Fernandes. “Engenharia da máquina de Stirling em armadilhas iônicas e protocolo de medida da função de distribuição de trabalho.” 2014. Masters Thesis, University of São Paulo. Accessed February 27, 2021.
http://www.teses.usp.br/teses/disponiveis/76/76131/tde-23042014-164204/ ;.
MLA Handbook (7th Edition):
Teizen, Victor Fernandes. “Engenharia da máquina de Stirling em armadilhas iônicas e protocolo de medida da função de distribuição de trabalho.” 2014. Web. 27 Feb 2021.
Vancouver:
Teizen VF. Engenharia da máquina de Stirling em armadilhas iônicas e protocolo de medida da função de distribuição de trabalho. [Internet] [Masters thesis]. University of São Paulo; 2014. [cited 2021 Feb 27].
Available from: http://www.teses.usp.br/teses/disponiveis/76/76131/tde-23042014-164204/ ;.
Council of Science Editors:
Teizen VF. Engenharia da máquina de Stirling em armadilhas iônicas e protocolo de medida da função de distribuição de trabalho. [Masters Thesis]. University of São Paulo; 2014. Available from: http://www.teses.usp.br/teses/disponiveis/76/76131/tde-23042014-164204/ ;
University of Michigan
25.
Moehring, David Lynn.
Remote Entanglement of Trapped Atomic Ions.
Degree: PhD, Physics, 2007, University of Michigan
URL: http://hdl.handle.net/2027.42/55675
► Since the development of quantum mechanics almost a century ago, there has been considerable controversy over the interpretations and predictions of quantum theory. Owing to…
(more)
▼ Since the development of quantum mechanics almost a century ago, there has been considerable controversy over the interpretations and predictions of quantum theory. Owing to the counterintuitive predictions of quantum mechanics, Einstein himself even wondered if this theory should be considered complete. While these questions have troubled many physicists over the past century, the development of the new field of quantum information science and the applications that may result from large scale quantum systems have brought many of these fundamental questions of quantum mechanics to the mainstream of not only theoretical but also experimental physics.
This thesis deals with a system at the heart of these questions - the first demonstration of quantum entanglement of two individual massive particles at a distance. I describe a theoretical and experimental framework for entanglement of two particles using
trapped atomic
ions.
Trapped ions are among the most attractive systems for scalable quantum information protocols because they can be well isolated from the environment and manipulated easily with lasers. Using our
trapped ion system, I show the first explicit demonstration of quantum entanglement between matter and light using a single ion and its single emitted photon. Further, by combining two such ion-photon entangled systems, I demonstrate the entanglement of two remotely located
ions. These entanglement protocols, together with the recent developments of
trapped ion quantum computing, can be used to create a platform for a scalable quantum information network, and perhaps confront some of the strangest features of quantum mechanics.
Advisors/Committee Members: Monroe, Christopher R. (committee member), Doering, Charles R. (committee member), Duan, Luming (committee member), Gerdes, David (committee member), Merlin, Roberto D. (committee member), Ann Arbor (affiliationumcampus).
Subjects/Keywords: Remote Entanglement of Trapped Atomic Ions; Physics; Science
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APA (6th Edition):
Moehring, D. L. (2007). Remote Entanglement of Trapped Atomic Ions. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/55675
Chicago Manual of Style (16th Edition):
Moehring, David Lynn. “Remote Entanglement of Trapped Atomic Ions.” 2007. Doctoral Dissertation, University of Michigan. Accessed February 27, 2021.
http://hdl.handle.net/2027.42/55675.
MLA Handbook (7th Edition):
Moehring, David Lynn. “Remote Entanglement of Trapped Atomic Ions.” 2007. Web. 27 Feb 2021.
Vancouver:
Moehring DL. Remote Entanglement of Trapped Atomic Ions. [Internet] [Doctoral dissertation]. University of Michigan; 2007. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/2027.42/55675.
Council of Science Editors:
Moehring DL. Remote Entanglement of Trapped Atomic Ions. [Doctoral Dissertation]. University of Michigan; 2007. Available from: http://hdl.handle.net/2027.42/55675
University of North Texas
26.
Lane, Ryan A.
Charged Particle Transport and Confinement Along Null Magnetic Curves and in Various Other Nonuniform Field Configurations for Applications in Antihydrogen Production.
Degree: 2016, University of North Texas
URL: https://digital.library.unt.edu/ark:/67531/metadc849779/
► Comparisons between measurements of the ground-state hyperfine structure and gravitational acceleration of hydrogen and antihydrogen could provide a test of fundamental physical theories such as…
(more)
▼ Comparisons between measurements of the ground-state hyperfine structure and gravitational acceleration of hydrogen and antihydrogen could provide a test of fundamental physical theories such as CPT (charge conjugation, parity, time-reversal) and gravitational symmetries. Currently, antihydrogen traps are based on Malmberg-Penning traps. The number of antiprotons in Malmberg-Penning traps with sufficiently low energy to be suitable for trappable antihydrogen production may be reduced by the electrostatic space charge of the positrons and/or collisions among antiprotons. Alternative trap designs may be needed for future antihydrogen experiments. A computational tool is developed to simulate charged particle motion in customizable magnetic fields generated by combinations of current loops and current lines. The tool is used to examine charged particle confinement in two systems consisting of dual, levitated current loops. The loops are coaxial and arranged to produce a magnetic null curve. Conditions leading to confinement in the system are quantified and confinement modes near the null curve and encircling one or both loops are identified. Furthermore, the tool is used to examine and quantify charged particle motion parallel to the null curve in the large radius limit of the dual, levitated current loops. An alternative to new trap designs is to identify the effects of the positron space in existing traps and to find modes of operation where the space charge is beneficial. Techniques are developed to apply the Boltzmann density relation along curved magnetic field lines. Equilibrium electrostatic potential profiles for a positron plasma are computed by solving Poisson's equation using a finite-difference method. Equilibria are computed in a model Penning trap with an axially varying magnetic field. Also, equilibria are computed for a positron plasma in a model of the ALPHA trap. Electric potential wells are found to form self-consistently. The technique is expanded to compute equilibria for a two-species plasma with an antiproton plasma confined by the positron space charge. The two-species equilibria are used to estimate timescales associated with three-body recombination, losses due to collisions between antiprotons, and temperature equilibration. An equilibrium where the three-body recombination rate is the smallest is identified.
Advisors/Committee Members: Ordonez, Carlos A., Schultz, D. R. (David R.), Buongiorno Nardelli, Marco, Weathers, Duncan L., Quintanilla, Sandra J. Ward.
Subjects/Keywords: antihydrogen; positrons; magnetic null curves; finite-difference; classical trajectory; Monte Carlo; Particles (Nuclear physics); Trapped ions.; Magnetic traps.
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ETH Zürich
27.
Negnevitsky, Vlad.
Feedback-stabilised quantum states in a mixed-species ion system.
Degree: 2018, ETH Zürich
URL: http://hdl.handle.net/20.500.11850/295923
► Trapped ions are among the leading platforms for realising quantum information processing (QIP). One major challenge in constructing a large-scale QIP device will be to…
(more)
▼ Trapped ions are among the leading platforms for realising quantum information processing (QIP). One major challenge in constructing a large-scale QIP device will be to incorporate feedback techniques for performing quantum error correction.
This thesis describes the development of a novel classical control system for ion trap quantum computing incorporating powerful real-time processing, and its use in performing a number of experiments involving such processing which form crucial building blocks for stabilizing large-scale ion trap systems.
A second major component is the demonstration of multi-qubit quantum control in mixed-species ion chains, which allowed low-crosstalk error-check operations to be performed over tens of cycles in a multi-qubit system for the first time.
Combined with feedback this allowed the stabilisation of entanglement over extended sequences of operations.
The technical advances in the thesis are a set of control hardware and related firmware and software that is specifically designed to meet the needs of quantum error correction.
It enables advanced sequences of measurement, real-time decision making and parameter adjustment needed for scalable experiments, with feedback a core element in its design.
Together the feedback-capable system and mixed-species setup were used to test new protocols including a single-qubit adaptive phase estimation scheme relying on rapid real-time classical computation and low-latency parameter updates to optimally extract information, outperforming standard non-adaptive fitting in speed and flexibility.
Single- and mixed-species gates between calcium and beryllium and associated experimental techniques were investigated using registers of two and three
ions, leading to the first gates between qubits encoded in optical and hyperfine transitions, which reached two-qubit fidelities above 96% and three-qubit fidelities of 93.8(5)%.
In preparatory steps for further work, a single-species dissipative protocol was used to prepare an entangled steady-state using a new approach devised in our group, while ion transport and separation experiments with up to four single-species and two mixed-species
ions into wells 800μm apart at excitations below ten quanta was implemented and optimised.
The main scientific result of the thesis is the demonstration of the repeated extraction of quantum correlations from a pair of beryllium
ions using a calcium ancilla qubit.
This type of correlation measurement is critical for performing fault-tolerant algorithms.
The measurement was then combined with real-time feedback in order to stabilize beryllium qubits in both subspaces and in entangled states, for sequences including up to fifty rounds of feedback, an order of magnitude more than previous work.
Information on the major infidelities in the protocols was extracted from the measurement outcome correlations.
This thesis concludes with an outlook for extending the role of both classical and quantum feedback in
trapped-ion QIP experiments.
This is the…
Advisors/Committee Members: Home, Jonathan, Ozeri, Roee, Wallraff, Andreas.
Subjects/Keywords: PHYSICS; Quantum information; Quantum computation; Trapped ions; Feedback; Real-time systems; info:eu-repo/classification/ddc/530; Physics
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APA ·
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MLA ·
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CSE |
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APA (6th Edition):
Negnevitsky, V. (2018). Feedback-stabilised quantum states in a mixed-species ion system. (Doctoral Dissertation). ETH Zürich. Retrieved from http://hdl.handle.net/20.500.11850/295923
Chicago Manual of Style (16th Edition):
Negnevitsky, Vlad. “Feedback-stabilised quantum states in a mixed-species ion system.” 2018. Doctoral Dissertation, ETH Zürich. Accessed February 27, 2021.
http://hdl.handle.net/20.500.11850/295923.
MLA Handbook (7th Edition):
Negnevitsky, Vlad. “Feedback-stabilised quantum states in a mixed-species ion system.” 2018. Web. 27 Feb 2021.
Vancouver:
Negnevitsky V. Feedback-stabilised quantum states in a mixed-species ion system. [Internet] [Doctoral dissertation]. ETH Zürich; 2018. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/20.500.11850/295923.
Council of Science Editors:
Negnevitsky V. Feedback-stabilised quantum states in a mixed-species ion system. [Doctoral Dissertation]. ETH Zürich; 2018. Available from: http://hdl.handle.net/20.500.11850/295923
Harvard University
28.
Marshall, Mason Claflin.
New Apparatus and Methods for the Measurement of the Proton and Antiproton Magnetic Moments.
Degree: PhD, 2019, Harvard University
URL: http://nrs.harvard.edu/urn-3:HUL.InstRepos:42029557
► The first direct measurement of the antiproton magnetic moment was performed using a single particle in a Penning trap. The result, μˉp/μN = 2.792 845…
(more)
▼ The first direct measurement of the antiproton magnetic moment was performed using a single particle in a Penning trap. The result, μˉp/μN = 2.792 845 (12) [4.4 ppm], is 680 times more precise than the previous best measurement. Together with a prior measurement of the proton magnetic moment in the same apparatus, this was the first direct comparison of the proton and antiproton magnetic moments. This stringent test of CPT invariance gave μˉp/μp = −1.000 000 (5) [5.0 ppm]. The observation of individual spin flips of a single proton, also reported here, opened the possibility of further improving measurement precision by orders of magnitude.
Improving this result by a factor of ~104 requires measuring μ outside the large magnetic field gradient needed to detect spin flips. Two methods are proposed to avoid the leading uncertainties in such a high-precision two-trap measurement. One of these is to measure single spin-flips of a single proton or antiproton. The other is to induce multiple spin flips in the presence of a spin-cyclotron coupling drive, and observe the resulting change in the cyclotron energy. The design, construction, and commissioning of an appropriate apparatus, with high-quality particle detection and newly designed Penning trap electrodes, is reported.
Physics
Advisors/Committee Members: Gabrielse, Gerald (advisor), Franklin, Melissa (committee member), Walsworth, Ronald (committee member).
Subjects/Keywords: Precision Measurement; Atomic, Molecular and Optical Physics; Trapped Ions; Fundamental Particles; Antimatter; Penning Traps; Low-Energy Particle Physics
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APA ·
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APA (6th Edition):
Marshall, M. C. (2019). New Apparatus and Methods for the Measurement of the Proton and Antiproton Magnetic Moments. (Doctoral Dissertation). Harvard University. Retrieved from http://nrs.harvard.edu/urn-3:HUL.InstRepos:42029557
Chicago Manual of Style (16th Edition):
Marshall, Mason Claflin. “New Apparatus and Methods for the Measurement of the Proton and Antiproton Magnetic Moments.” 2019. Doctoral Dissertation, Harvard University. Accessed February 27, 2021.
http://nrs.harvard.edu/urn-3:HUL.InstRepos:42029557.
MLA Handbook (7th Edition):
Marshall, Mason Claflin. “New Apparatus and Methods for the Measurement of the Proton and Antiproton Magnetic Moments.” 2019. Web. 27 Feb 2021.
Vancouver:
Marshall MC. New Apparatus and Methods for the Measurement of the Proton and Antiproton Magnetic Moments. [Internet] [Doctoral dissertation]. Harvard University; 2019. [cited 2021 Feb 27].
Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:42029557.
Council of Science Editors:
Marshall MC. New Apparatus and Methods for the Measurement of the Proton and Antiproton Magnetic Moments. [Doctoral Dissertation]. Harvard University; 2019. Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:42029557
University of Hong Kong
29.
Lu, Hongxia.
Geometric phases of mixed
states in trapped ions.
Degree: 2003, University of Hong Kong
URL: http://hdl.handle.net/10722/31018
Subjects/Keywords: Mathematical physics.; Trapped
ions.;
Geometric quantum phases.
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lu, H. (2003). Geometric phases of mixed
states in trapped ions. (Thesis). University of Hong Kong. Retrieved from http://hdl.handle.net/10722/31018
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):
Lu, Hongxia. “Geometric phases of mixed
states in trapped ions.” 2003. Thesis, University of Hong Kong. Accessed February 27, 2021.
http://hdl.handle.net/10722/31018.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lu, Hongxia. “Geometric phases of mixed
states in trapped ions.” 2003. Web. 27 Feb 2021.
Vancouver:
Lu H. Geometric phases of mixed
states in trapped ions. [Internet] [Thesis]. University of Hong Kong; 2003. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10722/31018.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lu H. Geometric phases of mixed
states in trapped ions. [Thesis]. University of Hong Kong; 2003. Available from: http://hdl.handle.net/10722/31018
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
30.
Lee, Aaron Christopher.
Engineering a Quantum Many-body Hamiltonian with Trapped Ions.
Degree: Physics, 2016, University of Maryland
URL: http://hdl.handle.net/1903/18734
► While fault-tolerant quantum computation might still be years away, analog quantum simulators offer a way to leverage current quantum technologies to study classically intractable quantum…
(more)
▼ While fault-tolerant quantum computation might still be years away, analog quantum simulators offer a way to leverage current quantum technologies to study classically intractable quantum systems. Cutting edge quantum simulators such as those utilizing ultracold atoms are beginning to study physics which surpass what is classically tractable. As the system sizes of these quantum simulators increase, there are also concurrent gains in the complexity and types of Hamiltonians which can be simulated. In this work, I describe advances toward the realization of an adaptable, tunable quantum simulator capable of surpassing classical computation. We simulate long-ranged Ising and XY spin models which can have global arbitrary transverse and longitudinal fields in addition to individual transverse fields using a linear chain of up to 24 Yb+ 171
ions confined in a linear rf Paul trap. Each qubit is encoded in the ground state hyperfine levels of an ion. Spin-spin interactions are engineered by the application of spin-dependent forces from laser fields, coupling spin to motion. Each spin can be read independently using state-dependent fluorescence. The results here add yet more tools to an ever growing quantum simulation toolbox. One of many challenges has been the coherent manipulation of individual qubits. By using a surprisingly large fourth-order Stark shifts in a clock-state qubit, we demonstrate an ability to individually manipulate spins and apply independent Hamiltonian terms, greatly increasing the range of quantum simulations which can be implemented. As quantum systems grow beyond the capability of classical numerics, a constant question is how to verify a quantum simulation. Here, I present measurements which may provide useful metrics for large system sizes and demonstrate them in a system of up to 24
ions during a classically intractable simulation. The observed values are consistent with extremely large entangled states, as much as ~95% of the system entangled. Finally, we use many of these techniques in order to generate a spin Hamiltonian which fails to thermalize during experimental time scales due to a meta-stable state which is often called prethermal. The observed prethermal state is a new form of prethermalization which arises due to long-range interactions and open boundary conditions, even in the thermodynamic limit. This prethermalization is observed in a system of up to 22 spins. We expect that system sizes can be extended up to 30 spins with only minor upgrades to the current apparatus. These results emphasize that as the technology improves, the techniques and tools developed here can potentially be used to perform simulations which will surpass the capability of even the most sophisticated classical techniques, enabling the study of a whole new regime of quantum many-body physics.
Advisors/Committee Members: Monroe, Christopher (advisor).
Subjects/Keywords: Quantum physics; Condensed matter physics; Atomic physics; entanglement; many-body physics; quantum information; quantum simulation; quantum thermalization; trapped ions
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APA ·
Chicago ·
MLA ·
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Manager
APA (6th Edition):
Lee, A. C. (2016). Engineering a Quantum Many-body Hamiltonian with Trapped Ions. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/18734
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):
Lee, Aaron Christopher. “Engineering a Quantum Many-body Hamiltonian with Trapped Ions.” 2016. Thesis, University of Maryland. Accessed February 27, 2021.
http://hdl.handle.net/1903/18734.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lee, Aaron Christopher. “Engineering a Quantum Many-body Hamiltonian with Trapped Ions.” 2016. Web. 27 Feb 2021.
Vancouver:
Lee AC. Engineering a Quantum Many-body Hamiltonian with Trapped Ions. [Internet] [Thesis]. University of Maryland; 2016. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1903/18734.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lee AC. Engineering a Quantum Many-body Hamiltonian with Trapped Ions. [Thesis]. University of Maryland; 2016. Available from: http://hdl.handle.net/1903/18734
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
◁ [1] [2] ▶
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Open Access Theses and Dissertations
