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Dissertations / Theses on the topic 'Qubit'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Nasser, Metwally Aly Mohamed. "Entangled qubit pairs." Diss., [S.l.] : [s.n.], 2002. http://edoc.ub.uni-muenchen.de/archive/00000083.

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2

Fay, Aurélien. "Couplage variable entre un qubit de charge et un qubit de phase." Phd thesis, Grenoble 1, 2008. http://www.theses.fr/2008GRE10071.

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Nous avons étudié la dynamique quantique d'un circuit supraconducteur constitué d'un SQUID dc couplé à un transistor à paires de Cooper fortement asymétrique (ACPT). Le SQUID dc est un qubit de phase contrôlé par un courant de polarisation et un champ magnétique. L'ACPT est un qubit de charge contrôlé par un courant de polarisation, un champ magnétique et une tension de la grille. Nous avons mesuré par spectroscopie micro-onde les premiers niveaux d'énergie du circuit couplé en fonction des paramètres de contrôle. Les mesures des états quantiques des qubits de charge et de phase sont réalisées
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3

Fay, Aurélien. "Couplage variable entre un qubit de charge et un qubit de phase." Phd thesis, Université Joseph Fourier (Grenoble), 2008. http://tel.archives-ouvertes.fr/tel-00310131.

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Nous avons étudié la dynamique quantique d'un circuit supraconducteur constitué d'un SQUID dc couplé à un transistor à paires de Cooper fortement asymétrique (ACPT). Le SQUID dc est un qubit de phase contrôlé par un courant de polarisation et un champ magnétique. L'ACPT est un qubit de charge contrôlé par un courant de polarisation, un champ magnétique et une tension de la grille.<br /><br />Nous avons mesuré par spectroscopie micro-onde les premiers niveaux d'énergie du circuit couplé en fonction des paramètres de contrôle. Les mesures des états quantiques des qubits de charge et de phase son
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4

Palomaki, Tauno A. "Dc SQUID phase qubit." College Park, Md.: University of Maryland, 2008. http://hdl.handle.net/1903/8575.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2008.<br>Thesis research directed by: Dept. of Physics. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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5

Viehmann, Oliver. "Multi-qubit circuit quantum electrodynamics." Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-160998.

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6

Aiello, Clarice Demarchi. "Qubit dynamics under alternating controls." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/93053.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 111-117).<br>In this thesis, we discuss two problems of quantum dynamics in the presence of alternating controls. Alternating controls arise in many protocols designed to extend the duration over which a qubit is a useful computational resource. This is accomplished by control sequences that either retard decoherence, or that accomplish a quantum operation in as short a time as possible. Th
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7

Convertini, Luciana. "Simulazione numerica di qubit a superconduttori di tipo transmon: dal layout al gate a singolo qubit." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.

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In questo lavoro di tesi è stato messo a punto un insieme di modelli e strumenti di simulazione numerica che consentono nel loro insieme l’analisi completa di un sistema formato da qubit a superconduttore di tipo transmon per il calcolo quantistico. Appoggiandosi agli elementi noti della teoria del transmon, l’analisi parte dalla definizione del layout da cui, mediante simulazioni elettromagnetiche, si estraggono le matrici di capacità ed induttanza dei vari componenti. Questo consente la costruzione dell’Hamiltoniano del sistema, noto il quale si possono eseguire le simulazioni nel dominio de
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8

Narla, Anirudh. "Flying Qubit Operations in Superconducting Circuits." Thesis, Yale University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10783459.

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<p> The quantum non-demolition (QND) measurement process begins by entangling the system to be measured, a qubit for example, with an ancillary degree of freedom, usually a system with an infinite-dimensional Hilbert space. The ancilla is amplified to convert the quantum signal into a measurable classical signal. The continuous classical signal is recorded by a measurement apparatus; a discrete measurement outcome is recovered by thresholding the integrated signal record. Measurements play a central role in technologies based on quantum theory, like quantum computation and communication. They
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9

Weber, Steven Joseph. "Quantum Trajectories of a Superconducting Qubit." Thesis, University of California, Berkeley, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3686046.

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<p> In quantum mechanics, the process of measurement is intrinsically probabilistic. As a result, continuously monitoring a quantum system will randomly perturb its natural unitary evolution. An accurate measurement record documents this stochastic evolution and can be used to reconstruct the quantum trajectory of the system state in a single experimental iteration. We use weak measurements to track the individual quantum trajectories of a superconducting qubit that evolves under the competing influences of continuous weak measurement and Rabi drive. We analyze large ensembles of such trajecto
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10

Bader, Samuel James. "Higher levels of the transmon qubit." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/92701.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Physics, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 91-95).<br>This thesis discusses recent experimental work in measuring the properties of higher levels in transmon qubit systems. The first part includes a thorough overview of transmon devices, explaining the principles of the device design, the transmon Hamiltonian, and general Circuit Quantum Electrodynamics concepts and methodology. The second part discusses the experimental setup and methods employed in measuring the highe
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11

Tufarelli, T. "Qubit-controlled displacements in Markovian environments." Thesis, University College London (University of London), 2012. http://discovery.ucl.ac.uk/1344094/.

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12

Cammack, Helen Mary. "Coherence protection in coupled qubit systems." Thesis, University of St Andrews, 2018. http://hdl.handle.net/10023/16457.

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Decoherence is a major barrier to the implementation of quantum technologies. Theoretical techniques for understanding decoherence in composite systems have traditionally been focused on systems with distinguishable emission spectra, where measuring the frequency of an emitted photon allows one to determine which process took place. Here the photon contains information about the state of the system. On the other hand, systems with indistinguishable spectra do not necessarily completely reveal information about the state of the system when a photon is emitted. It can be impossible to say for ce
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13

Kelly, Stephen C. "EXPLORATION OF QUBIT ASSISTED CAVITY OPTOMECHANICS." Miami University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=miami1408097717.

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14

Rubens, William. "On the black hole/qubit correspondence." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/9594.

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We present the evidence for and intriguing black hole/qubit correspondence. This correspondence will map the entanglement classification of three and four qubits over to the BPS and extremal classification of black holes in the STU model. We will start by looking at BPS black holes and use a variety of means to classify them and calculate their orbits. We will discover that three qubits, or more accurately, three real qubits will exhibit exactly the same structure as the black holes. This will allow us to identify the entropy of the black hole with the entanglement of the qubits. A mathematica
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15

Wernz, Johannes. "Dekohärenz gekoppelter Spin- und Qubit-Systeme." [S.l. : s.n.], 2003. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB10761312.

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16

Perez, Veitia Andrzej. "Local Entanglement Generation in Two-Qubit Systems." Scholarly Repository, 2010. http://scholarlyrepository.miami.edu/oa_dissertations/476.

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We study the entanglement of two-qubit systems resulting from local interactions with spatially extended bosonic systems. Our results apply to the case where the initial state of the bosonic system is represented by a statistical mixture of states with fixed particle number. In particular, we derive and discuss necessary conditions to generate entanglement in the two-qubit system. We also study the scenario where the joint system is initially in its ground state and the interaction is switched on adiabatically. Using time independent perturbation theory and the adiabatic theorem, we show co
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17

Keitch, Benjamin. "A Quantum Memory Qubit in Calcium-43." Thesis, University of Oxford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.487270.

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The hyperfine ground states of a 43Ca+ trapped ion are proposed as a memory qubit. The experimental details to implement such a qubit are presented. These include the design and implementation of a pulse-sequencer to produce pulse sequences for single qubit rotations and other timed experimental sequences. A Raman laser system running at 396nm with a frequency offset of 3.2GHz, based on optically injected violet diode lasers, is presented along with an analysis of its performance. A laser-locking scheme based on the Pound-Drever-Hall method has been built and the design and results are present
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18

Low, Guang Hao. "Quantum signal processing by single-qubit dynamics." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/115025.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2017.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 117-125).<br>Quantum computation is the most powerful realizable model of computation, and is uniquely positioned to solve specialized problems intractable to classical computers. This quantum advantage arises from directly exploiting the strangeness of quantum mechanics that is fundamental to reality. As such, one expects our understanding of quantum processes in physical systems to be indispensable to the design and executi
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19

Xiao, Jiayang. "Investigating Entanglement Transformations in Three-qubit States." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/theses/1752.

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This thesis studies the manipulation of entanglement in three-qubit quantum systems. I consider the operational setting in which the qubits are distributed to three spatially separated parties. The parties act locally on their quantum systems and share classical communication with one another, a scenario commonly called local operations and classical communication (LOCC). In the LOCC setting, there are two different classes of entanglement in multipartite systems, called the GHZ and W classes, which are inequivalent in the sense that states from one class cannot be transformed into the othe
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20

Conway, Lamb Ian. "Cryogenic Control Beyond 100 Qubits." Thesis, The University of Sydney, 2016. http://hdl.handle.net/2123/17046.

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Quantum computation has been a major focus of research in the past two decades, with recent experiments demonstrating basic algorithms on small numbers of qubits. A large-scale universal quantum computer would have a profound impact on science and technology, providing a solution to several problems intractable for classical computers. To realise such a machine, today's small experiments must be scaled up, and a system must be built which provides control and measurement of many hundreds of qubits. A device of this scale is challenging: qubits are highly sensitive to their environment, and sop
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21

Silveri, M. (Matti). "Nonlinear and stochastic driving of a superconducting qubit." Doctoral thesis, University of Oulu, 2013. http://urn.fi/urn:isbn:9789526201184.

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Abstract The topic of this thesis is superconducting electric circuits. Technical advances have made possible the experimental study of Josephson junction based circuit elements which sustain quantum mechanical properties long enough to be denoted as quantum devices. The quantum state can be controlled with electronic variables and measured using standard electrical setups. The research is motivated by the possibility to examine quantum phenomena in circumstances that can be customized, prospects of new quantum devices, and the development of quantum information processing. This thesis present
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22

Tarlton, James Edward. "Probing qubit memory errors at the 10⁻⁵ level." Thesis, Imperial College London, 2018. http://hdl.handle.net/10044/1/60650.

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Trapped atomic ions are a promising candidate system for developing a quantum computer. All elementary operations for quantum information processing have al- ready been achieved in trapped-ion systems with errors below the “fault-tolerant threshold”, meaning that these errors are sufficiently small to be removed with quan- tum error correction. However, the preservation of quantum information over the short timescales that are relevant for quantum computing has not, to our knowledge, been measured before in trapped-ion qubits. Previous investigations have measured decoherence over long times a
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23

Waegell, Mordecai. "Nonclassical Structures within the N-qubit Pauli Group." Digital WPI, 2013. https://digitalcommons.wpi.edu/etd-dissertations/150.

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Structures that demonstrate nonclassicality are of foundational interest in quantum mechanics, and can also be seen as resources for numerous applications in quantum information processing - particularly in the Hilbert space of N qubits. The theory of entanglement, quantum contextuality, and quantum nonlocality within the N-qubit Pauli group is further developed in this thesis. The Strong Kochen-Specker theorem and the structures that prove it are introduced and explored in detail. The pattern of connections between structures that show entanglement, contextuality, and nonlocality is explained
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24

Lee, Janice C. (Janice Cheng-Yee) 1978. "Resonant readout of a superconducting persistent current qubit." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/37845.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2006.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Includes bibliographical references (p. 211-218).<br>Superconducting Josephson junction devices rank among the best candidates for realizing a quantum computer. While the coherent control of quantum dynamics has been demonstrated in these solid-state, macroscopic quantum systems, a major challenge has been to increase the coheren
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25

Tian, Lin 1971. "A superconducting flux QuBit : measurement, noise and control." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/8483.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 2002.<br>Includes bibliographical references (p. 197-213).<br>A superconducting quantum bit can be made with three nano-scale Josephson junctions connected in series. In this thesis, various aspects of this qubit are studied. It is shown numerically that the qubit behaves as a giant magnetic dipole with quantum tunneling between the two qubit states. The natural coupling between qubits plus the manipulation on a single qubit state provides the building blocks for universal quantum computing. The state of the qubit can be
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26

Berns, David Marc. "Large amplitude driving of a persistent current qubit." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45451.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2008.<br>Includes bibliographical references (p. 181-190).<br>In this thesis, the persistent current qubit in the presence of large amplitude microwave radiation is studied. Three main results are presented in this work. A new coherent quasi classical regime has been observed, where coherent quantum dynamics persist even while transitions between energy levels are caused by many photon modes simultaneously. A new theoretical treatment of this regime has been developed, and remarkable agreement between theory and experime
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27

Cornelio, Marcio Fernando. "Estados emaranhados quânticos tri-partidos com um qubit." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-01092008-161014/.

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Estudamos o emaranhamento quântico de estados puros emaranhados tri-partidos quando uma das partes é um qubit. Apresentamos um método para encontrar as decomposições do estado tri-partido mais simples do que sucessivas decomposições de Schmidt. Esse método permite encontrar uma grande quantidade de diferentes famílias de estados emaranhados tri-partidos. Essas famílias são classificadas de acordo com dimensão dos blocos de Jordan de uma matriz obtida do estado emaranhado. Além disso, também demonstramos que estados pertencentes a famílias distintas não podem ser convertidos um no outro por ope
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28

Ткачов, В. А. "11 qubit quantum computers with cloud computing access." Thesis, Київський національний університет технологій та дизайну, 2018. https://er.knutd.edu.ua/handle/123456789/10795.

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29

Schauer, Floyd [Verfasser], and Dominique [Akademischer Betreuer] Bougeard. "Realizing spin qubits in 28Si/SiGe: heterostructure gating, qubit decoherence and asymmetric charge sensing / Floyd Schauer ; Betreuer: Dominique Bougeard." Regensburg : Universitätsbibliothek Regensburg, 2021. http://d-nb.info/1225935849/34.

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Cerfontaine, Pascal [Verfasser], Jörg Hendrik [Akademischer Betreuer] Bluhm, and David P. [Akademischer Betreuer] DiVincenzo. "High-fidelity single- and two-qubit gates for two-electron spin qubits / Pascal Cerfontaine ; Jörg Hendrik Bluhm, David P. DiVincenzo." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1211487806/34.

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31

Friedrich, Marion. "Vom Neuron zum Qubit auf den Spuren des Bewusstseins." Marburg Tectum-Verl, 2007. http://deposit.d-nb.de/cgi-bin/dokserv?id=3034725&prov=M&dok_var=1&dok_ext=htm.

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32

Friedrich, Marion. "Vom Neuron zum Qubit : auf den Spuren des Bewusstseins /." Marburg : Tectum-Verl, 2008. http://deposit.d-nb.de/cgi-bin/dokserv?id=3034725&prov=M&dokv̲ar=1&doke̲xt=htm.

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33

Olaya-Castro, Alexandra. "Dynamics of quantum correlations in multi-qubit-cavity systems." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419329.

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34

Cooper, Rachel S. G. "A study of magnetic interactions and potential qubit synthesis." Thesis, University of Manchester, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492932.

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Since the discovery that it is possible for single molecules to retain their magnetisation in the absence of a magnetic field, this area of research has been considered to be of immense interest research groups from around the world have been attempting to reproduce this phenomenon using a wide range of transition metals and different bridging ligands, each group utilising different synthetic routes in an attempt to produce large nuclearity clusters with large negative spin anisotropy.
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35

Griffith, Elias James. "Characterisation and Rapid Purification of a Superconducting Charge Qubit." Thesis, University of Liverpool, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485993.

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The work of this thesis focuses on stochastic methods for the simulation of superconducting charge qubits, also known as Cooper pair boxes, which are promising candidates for large scale quantum information processing. To aid non-physicists, a brief outline of the structure of quantum mechanics is provided using the· Dirac formalism. Using the so called 'Backreaction effect', we consider if any information can be obtained regarding the qubit behaviour, through detecting the changes observed in the frequency spectrum of the coupled biasing circuitry, modelled as a dissipative oscillator circ
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36

Neumann, Christian [Verfasser]. "Isotopically-enriched 28Si heterostructures for qubit devices / Christian Neumann." München : Verlag Dr. Hut, 2017. http://d-nb.info/1149579919/34.

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37

Farrell, Matthew W. "Nonadiabatic control of a superconducting qubit via strong driving." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/44466.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2008.<br>Includes bibliographical references (leaf 43).<br>Quantum computation offers the promise of speeding up many calculations that are intractable on classical computers, including but not limited to factoring and the simulation of quantum mechanical systems. Quantum computation is achieved by replacing the bits of a classical computer with quoits. Qubits generalize bits by allowing not only the classical states of zero and one, but also any arbitrary superposition of zero and one. These qubits are implemented as two-
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38

Chen, Zilong 1981. "Towards qubit noise spectroscopy by quantum bang-bang control." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/32721.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, June 2004.<br>Includes bibliographical references (p. 89-91).<br>Quantum bang-bang control is a method of suppressing decoherence in qubits [VKL99, VL98]. To date, mathematically rigorous treatments of quantum bang-bang control offered little intuition. To complement existing approaches and to seek better understanding, I present intuitive pictures to think about quantum bang-bang control. In addition, I develop a formalism for treating phase noise moments of a qubit under quantum bang-bang control. Although the desired pu
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Nakada, Daniel Yuki 1975. "Fabrication and measurement of a niobium persistent current qubit." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/18049.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.<br>Includes bibliographical references (p. 192-201).<br>Recent successes with superconducting Josephson junction qubits make them prime candidates for the implementation of quantum computing. This doctoral thesis details the study of a niobium Josephson junction circuit for quantum computing applications. The thesis covers two main areas: 1) the fabrication of sub-micron niobium Josephson junction devices using a Nb/Al/A1Ox/Nb trilayer process and 2) measurements of unique quantu
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Strömberg, Philip, and Karlsson Vera Blomkvist. "4-qubit Grover's algorithm implemented for the ibmqx5 architecture." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-229797.

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Quantum computing is a quickly growing field of research thanks to recent hardware advances. The quantum mechanical properties of quantum computers allow them to solve certain families of problems faster than classical computers. A quantum algorithm solving such a problem is Grover's algorithm, which finds an element in an unordered set faster than any classical search algorithm. In this paper an implementation of a 4-qubit Grover's algorithm for the IBM Q computer ibmqx5 is presented. Executing the implementation on an ibmqx5 simulator yield results in line with the theoretically optimal resu
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Hoffer, Cole R. "Superconducting qubit readout pulse optimization using deep reinforcement learning." Thesis, Massachusetts Institute of Technology, 2021. https://hdl.handle.net/1721.1/130691.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, February, 2021<br>Cataloged from the official PDF of thesis.<br>Includes bibliographical references (pages 101-106).<br>Quantum computers promise to solve specific problems significantly faster than classical computers. Superconducting quantum processors comprising more than 50 qubits can achieve quantum supremacy, the ability to outperform existing classical computers for particular problems. However, to build a useful quantum computer, the quantum processor's constituent compone
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42

Dilley, Daniel Jacob. "An Insight on Nonlocal Correlations in Two-Qubit Systems." OpenSIUC, 2016. https://opensiuc.lib.siu.edu/theses/2069.

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In this paper, we introduce the motivation for Bell inequalities and give some background on two different types: CHSH and Mermin's inequalities. We present a proof for each and then show that certain quantum states can violate both of these inequalities. We introduce a new result stating that for four given measurement directions of spin, two respectively from Alice and two from Bob, which are able to produce a violation of the Bell inequality for an arbitrary shared quantum state will also violate the Bell inequality for a maximally entangled state. Then we provide another new result that c
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43

Sousa, Delano Klinger Alves. "O produto de quartebits não gera um qubit entrelaçado." Universidade Federal do Ceará, 2017. http://www.repositorio.ufc.br/handle/riufc/22860.

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SOUZA, D. K. A. O produto de quartebits não gera um qubit entrelaçado. 2017. 69 fl. Dissertação (Mestrado em Engenharia Elétrica e de Computação), Campus Sobral, Universidade Federal do Ceará, Sobral, 2017.<br>Submitted by Programa de Pós-Graduação Engenharia Elétrica e de Computação (secretaria_ppgeec@sobral.ufc.br) on 2017-05-23T20:35:40Z No. of bitstreams: 1 2017_dis_dkasouza.pdf: 525869 bytes, checksum: 5bde9906f2ed9c3bd7ea2a782eb61a36 (MD5)<br>Rejected by Ana Márcia Sousa (marciasousa@ufc.br), reason: Prezada Milleani, Os seguintes campos devem ser revistos e corrigidos quanto ao depósit
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Rogers, Nick. "Designing a Macroscopic Singlet-Triplet Qubit In a Linear Array of Quantum Dots Embedded In Nanowires." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34209.

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In this thesis I present a theory of a macroscopic singlet-triplet qubit in quantum dots embedded in nanowires, each containing 4 electrons and together simulating an artficial Haldane gap material. A Haldane gap material exhibits a 4-fold degenerate ground state separated by an energy gap from excitations. The ground state is equivalent to a degenerate spin-singlet and -triplet state. The 4 degenerate states exhibit the characteristics of spins-1/2 localized on either end of the chain. These states may be used as a coded qubit for quantum information processing. Using the effective mass
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45

Escott, Christopher Colin Electrical Engineering &amp Telecommunications Faculty of Engineering UNSW. "Modelling of phosphorus-donor based silicon qubit and nanoelectronic devices." Publisher:University of New South Wales. Electrical Engineering & Telecommunications, 2008. http://handle.unsw.edu.au/1959.4/41470.

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Modelling of phosphorus donor-based silicon (Si:P) qubit devices and mesoscopic single-electron devices is presented in this thesis. This theoretical analysis is motivated by the use of Si:P devices for scalable quantum computing. Modelling of Si:P single-electron devices (SEDs) using readily available simulation tools is presented. The mesoscopic properties of single and double island devices with source-drain leads is investigated through ion implantation simulation (using Crystal-TRIM), 3D capacitance extraction (FastCap) and single-electron circuit simulation (SIMON). Results from modellin
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46

Viehmann, Oliver [Verfasser], and Florian [Akademischer Betreuer] Marquardt. "Multi-qubit circuit quantum electrodynamics / Oliver Viehmann. Betreuer: Florian Marquardt." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2013. http://d-nb.info/1042147558/34.

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47

Laflamme, Catherine. "Weak qubit measurement with a nonlinear cavity: beyond perturbation theory." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=110503.

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In this thesis we consider the quantum measurement properties of a driven cavity with a Kerr-type nonlinearity where the signal to be measured is a dispersively coupled qubit. Focusing on an operating regime that is near a bifurcation point,we calculate analytic expressions for the backaction dephasing rate and measurement rate beyond leading-order perturbation theory. This is done by using a phase-space approach which accounts for cavity noise squeezing. We consider two different methods to obtain an analytic result: the first is using an approximation common in the literature, the cavity dy
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48

Yan, Fei Ph D. Massachusetts Institute of Technology. "Coherence characterization with a superconducting flux qubit through NMR approaches." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82442.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2013.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 191-200).<br>This thesis discusses a series of experimental studies that investigate the coherence properties of a superconducting persistent-current or flux qubit, a promising candidate for developing a scalable quantum processor. A collection of coherence characterization experiments and techniques that originate from the field of nuclear magnetic resonance (NMR) are implemented. In particular, one type
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49

Song, Qiao, Swati Singh, Keye Zhang, Weiping Zhang, and Pierre Meystre. "One qubit and one photon: The simplest polaritonic heat engine." AMER PHYSICAL SOC, 2016. http://hdl.handle.net/10150/622670.

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Hybrid quantum systems can often be described in terms of polaritons. These are quasiparticles formed of superpositions of their constituents, with relative weights depending on some control parameter in their interaction. In many cases, these constituents are coupled to reservoirs at different temperatures. This suggests a general approach to the realization of polaritonic heat engines where a thermodynamic cycle is realized by tuning this control parameter. Here we discuss what is arguably the simplest such engine, a single qubit coupled to a single photon. We show that this system can extra
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50

Dahanayake, Duminda. "The role of supersymmetry in the black hole/qubit correspondence." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/6060.

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This thesis explores the numerous relationships between the entropy of black hole solutions in supergravity and the entanglement of multipartite systems in quantum information theory: the so-called black hole/qubit correspondence. We examine how, through the correspondence, the dyonic charges in the entropy of supersymmetric black hole solutions are directly matched to the state vector coefficients in the entanglement measures of their quantum information analogues. Moreover the Uduality invariance of the black hole entropy translates to the stochastic local operations and classical communicat
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