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Dissertations / Theses on the topic 'Quantum computers'

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1

Дядечко, Алла Миколаївна, Алла Николаевна Дядечко, Alla Mykolaivna Diadechko, and S. I. Polevik. "Quantum computers." Thesis, Видавництво СумДУ, 2008. http://essuir.sumdu.edu.ua/handle/123456789/16043.

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Башлак, Ірина Анатоліївна, Ирина Анатольевна Башлак, Iryna Anatoliivna Bashlak, and O. Lobunko. "Quantum computers." Thesis, Вид-во СумДУ, 2009. http://essuir.sumdu.edu.ua/handle/123456789/16767.

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Huang, Wei-Han 1979. "Instrumentation for quantum computers." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/30104.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, February 2004.<br>Includes bibliographical references (p. 209-215).<br>Quantum computation poses challenging engineering and basic physics issues for the control of nanoscale systems. In particular, experimental realizations of up to seven-qubit NMR quantum computers have acutely illustrated how quantum circuits require extremely precise control instrumentation for pulsed excitation. In this thesis, we develop two general-purpose, low-cost pulse programmers and two Class E power amplifie
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Jandura, Sven. "Optimized quantum gates for neutral atom quantum computers." Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAF027.

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Les atomes neutres sont récemment apparus comme une plate-forme compétitive pour l'informatique quantique. Le développement de portes quantiques intriquées de haute délité est la clé du succès de cette plateforme. Dans cette thèse, nous développons plusieurs protocoles nouveaux et optimisés pour l'implémentation de portes quantiques à deux et plusieurs qubits sur des atomes neutres. Nous introduisons la famille des protocoles temps-optimaux, qui implémentent une porte quantique donnée aussi rapidement que possible en appliquant une impulsion laser unique avec une phase dépendant du temps. Nous
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Mower, Jacob. "Photonic quantum computers and communication systems." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/103851.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2015.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 123-137).<br>Quantum information processors have been proposed to solve classically intractable or unsolvable problems in computing, sensing, and secure communication. There has been growing interest in photonic implementations of quantum processors as they offer relatively long coherence lengths, precise state manipulation, and efficient measurement. In this thesis, we first present experi
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Vicente, Nieto Irene. "Towards Machine Translation with Quantum Computers." Thesis, Stockholms universitet, Fysikum, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-196602.

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This work explores the possibilities to use quantum computers and quantum based language models for machine translation. Precise translation requires vast expertise and knowledge of various languages, thus machine translationis still far from superseding humans. Quantum computers could improve machine translation due to their high computational power, as they benefit from properties such as superposition and entanglement to process data faster and in parallel. We focused our work on the DIStributional COmpositional CATegorical (DisCoCat) semantics and its python toolbox DisCoPy developed by [1
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Mims, Mark McGrew. "Dynamical stability of quantum algorithms /." Full text (PDF) from UMI/Dissertation Abstracts International, 2000. http://wwwlib.umi.com/cr/utexas/fullcit?p3004342.

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Babar, Zunaira. "Quantum error correction codes." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/380165/.

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Quantum parallel processing techniques are capable of solving certain complex problems at a substantially lower complexity than their classical counterparts. From the perspective of telecommunications, this quantum-domain parallel processing provides a plausible solution for achieving full-search based multi-stream detection, which is vital for future gigabit-wireless systems. The peculiar laws of quantum mechanics have also spurred interest in the absolutely secure quantum-based communication systems. Unfortunately, quantum decoherence imposes a hitherto insurmountable impairment on the pract
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Papanikolaou, Nikolaos K. "Model checking quantum protocols." Thesis, University of Warwick, 2009. http://wrap.warwick.ac.uk/2236/.

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This thesis describes model checking techniques for protocols arising in quantum information theory and quantum cryptography. We discuss the theory and implementation of a practical model checker, QMC, for quantum protocols. In our framework, we assume that the quantum operations performed in a protocol are restricted to those within the stabilizer formalism; while this particular set of operations is not universal for quantum computation, it allows us to develop models of several useful protocols as well as of systems involving both classical and quantum information processing. We detail the
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10

Giesecke, Normen. "Ternary quantum logic." PDXScholar, 2006. https://pdxscholar.library.pdx.edu/open_access_etds/4092.

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The application of Moore's Law would not be feasible by using the computing systems fabrication principles that are prevalent today. Fundamental changes in the field of computing are needed to keep Moore's Law operational. Different quantum technologies are available to take the advancement of computing into the future. Logic in quantum technology uses gates that are very different from those used in contemporary technology. Limiting itself to reversible operations, this thesis presents different methods to realize these logic gates. Two methods using Generalized Ternary Gates and Muthukrishna
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Valente, Diego. "DECOHERENCE IN SEMICONDUCTOR SOLID-STATE QUANTUM COMPUTERS." Doctoral diss., University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2797.

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In this dissertation we discuss decoherence in charge qubits formed by multiple lateral quantum dots in the framework of the spin-boson model and the Born-Markov approximation. We consider the intrinsic decoherence caused by the coupling to bulk phonon modes and electromagnetic environmental fluctuations. In the case of decoherence caused by phonon coupling, two distinct quantum dot configurations are studied and proposed as setups that mitigate its nocive effects : (i) Three quantum dots in a ring geometry with one excess electron in total and (ii) arrays of quantum dots where the computation
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Lukac, Martin. "Quantum Inductive Learning and Quantum Logic Synthesis." PDXScholar, 2009. https://pdxscholar.library.pdx.edu/open_access_etds/2319.

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Since Quantum Computer is almost realizable on large scale and Quantum Technology is one of the main solutions to the Moore Limit, Quantum Logic Synthesis (QLS) has become a required theory and tool for designing Quantum Logic Circuits. However, despite its growth, there is no any unified aproach to QLS as Quantum Computing is still being discovered and novel applications are being identified. The intent of this study is to experimentally explore principles of Quantum Logic Synthesis and its applications to Inductive Machine Learning. Based on algorithmic approach, I first design a Genetic Alg
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Zuccon, Guido. "Document ranking with quantum probabilities." Thesis, University of Glasgow, 2012. https://eprints.qut.edu.au/69287/1/zuccon2012b.pdf.

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In this thesis we investigate the use of quantum probability theory for ranking documents. Quantum probability theory is used to estimate the probability of relevance of a document given a user's query. We posit that quantum probability theory can lead to a better estimation of the probability of a document being relevant to a user's query than the common approach, i. e. the Probability Ranking Principle (PRP), which is based upon Kolmogorovian probability theory. Following our hypothesis, we formulate an analogy between the document retrieval scenario and a physical scenario, that of the doub
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Zuccon, Guido. "Document ranking with quantum probabilities." Thesis, University of Glasgow, 2012. http://theses.gla.ac.uk/3463/.

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In this thesis we investigate the use of quantum probability theory for ranking documents. Quantum probability theory is used to estimate the probability of relevance of a document given a user's query. We posit that quantum probability theory can lead to a better estimation of the probability of a document being relevant to a user's query than the common approach, i.e. the Probability Ranking Principle (PRP), which is based upon Kolmogorovian probability theory. Following our hypothesis, we formulate an analogy between the document retrieval scenario and a physical scenario, that of the doubl
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Raynaud, Guillaume. "Fibred contextual quantum physics." Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/1685/.

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Inspired by the recast of the quantum mechanics in a toposical framework, we develop a contextual quantum mechanics via the geometric mathematics to propose a quantum contextuality adaptable in every topos. The contextuality adopted corresponds to the belief that the quantum world must only be seen from the classical viewpoints à la Bohr consequently putting forth the notion of a context, while retaining a realist understanding. Mathematically, the cardinal object is a spectral Stone bundle Σ → B (between stably-compact locales) permitting a treatment of the kinematics, fibre by fibre and full
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Grattage, Jonathan James. "A functional quantum programming language." Thesis, University of Nottingham, 2006. http://eprints.nottingham.ac.uk/10250/.

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This thesis introduces the language QML, a functional language for quantum computations on finite types. QML exhibits quantum data and control structures, and integrates reversible and irreversible quantum computations. The design of QML is guided by the categorical semantics: QML programs are interpreted by morphisms in the category FQC of finite quantum computations, which provides a constructive operational semantics of irreversible quantum computations, realisable as quantum circuits. The quantum circuit model is also given a formal categorical definition via the category FQC. QML integrat
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Botsinis, Panagiotis. "Quantum-assisted multi-user wireless systems." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/381235/.

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The high complexity of numerous optimal classical communication schemes, such as the Maximum Likelihood (ML) and Maximum A posteriori Probability (MAP) Multi-User Detector (MUD) designed for coherent detection or the ML and MAP Multiple-Symbol Differential Detectors (MSDD) conceived for non-coherent receivers often prevents their practical implementation. In this thesis we commence with a review and tutorial on Quantum Search Algorithms (QSA) and propose a number of hard-output and iterative Quantum-assisted MUDs (QMUD) and MSDDs (QMSDD). We employ a QSA, termed as the Durr-Hyer Algorithm (DHA
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Barrett, S. "Decoherence and measurement in solid state quantum computers." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.596410.

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The discovery of quantum algorithms that can outperform the best known classical algorithms for certain problems has, in recent years, instigated a rapid growth in the study of quantum computation. A number of schemes for the <i>practical </i>implementation of quantum logic in a semiconductor device have been proposed. These schemes, being an extension of existing semiconductor technology, have the potential to be scaled to a large number of qubits. There is now a substantial experimental effort, worldwide, to build quantum logid devices in semiconductor systems. However, a number of important
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Bririd, Adel. "Study of decoherence and architecture for quantum computers." Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614246.

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Russell, Nick. "Characterisation and control of linear optical quantum computers." Thesis, University of Bristol, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.689673.

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Quantum technologies have the potential to disrupt almost every aspect of our lives, the classic example being the prospect of a quantum computer breaking the classical encryption on which so much of the current world relies. Perhaps fortunately, the technical challenges involved in building such a machine are formidable and it remains a long term goal. At present, less disruptive quantum technologies such as quantum key distribution and quantum random number generation are already making their way out of the lab and being pursued by commercial enterprises. Between these two extremes, there is
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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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Annovi, Filippo <1986&gt. "Exploring Quantum Speed-up Through Cluster-state Computers." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amsdottorato.unibo.it/7008/1/Annovi_Filippo_Tesi.pdf.

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The aim of this thesis is to investigate the nature of quantum computation and the question of the quantum speed-up over classical computation by comparing two different quantum computational frameworks, the traditional quantum circuit model and the cluster-state quantum computer. After an introductory survey of the theoretical and epistemological questions concerning quantum computation, the first part of this thesis provides a presentation of cluster-state computation suitable for a philosophical audience. In spite of the computational equivalence between the two frameworks, their difference
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Annovi, Filippo <1986&gt. "Exploring Quantum Speed-up Through Cluster-state Computers." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amsdottorato.unibo.it/7008/.

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The aim of this thesis is to investigate the nature of quantum computation and the question of the quantum speed-up over classical computation by comparing two different quantum computational frameworks, the traditional quantum circuit model and the cluster-state quantum computer. After an introductory survey of the theoretical and epistemological questions concerning quantum computation, the first part of this thesis provides a presentation of cluster-state computation suitable for a philosophical audience. In spite of the computational equivalence between the two frameworks, their difference
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24

Zhang, Jing. "Neutron-proton pairing problems simulated on quantum computers." Electronic Thesis or Diss., université Paris-Saclay, 2025. http://www.theses.fr/2025UPASP038.

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Le traitement des degrés de liberté de spin et de l'isospin (neutron et proton) sur un ordinateur quantique constitue un jalon pour les futures applications de cette technologie émergente dans la recherche en physique nucléaire.Cette thèse examine la résolution du problème d'appariement neutron-proton à travers des méthodes développées sur ordinateurs quantiques, en mettant l'accent sur le développement d'algorithmes innovants permettant de décrire à la fois les propriétés de l'état fondamental et les états excités de basse énergie pour des systèmes formés de protons et de neutrons en interact
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Devitt, Simon John. "Quantum information engineering : concepts to quantum technologies /." Connect to thesis, 2007. http://eprints.unimelb.edu.au/archive/00003925.

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Chan, Ka Ho Adrian. "Quantum information processing with semiconductor quantum dots." Thesis, University of Cambridge, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648684.

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Brandhorst-Satzkorn, Johan. "A Review of Freely Available Quantum Computer Simulation Software." Thesis, Linköpings universitet, Matematik och tillämpad matematik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-78650.

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A study has been made of a few different freely available Quantum Computer simulators.All the simulators tested are available online on their respective websites. A number oftests have been performed to compare the different simulators against each other. Someuntested simulators of various programming languages are included to show the diversityof the quantum computer simulator applications. The conclusion of the review is that LibQuantum is the best of the simulatorstested because of ease of coding, a great amount of pre-defined functionimplementations and decoherence simulation support among
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Ardeshir-Larijani, Ebrahim. "Automated equivalence checking of quantum information systems." Thesis, University of Warwick, 2014. http://wrap.warwick.ac.uk/63940/.

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Quantum technologies have progressed beyond the laboratory setting and are beginning to make an impact on industrial development. The construction of practical, general purpose quantum computers has been challenging, to say the least. But quantum cryptographic and communication devices have been available in the commercial marketplace for a few years. Quantum networks have been built in various cities around the world, and plans are afoot to launch a dedicated satellite for quantum communication. Such new technologies demand rigorous analysis and verification before they can be trusted in safe
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Yang, Kaiyu, and 楊開宇. "Quantum information processing with quantum dots and Josephson junctions." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B29285835.

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Younes, Ahmed. "Practical search algorithms and Boolean circuits for quantum computers." Thesis, University of Birmingham, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409283.

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Yang, Jiaying. "Support Vector Machines on Noisy Intermediate-Scale Quantum Computers." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-266112.

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Support vector machine algorithms are considered essential for the implementationof automation in a radio access network. Specifically, they are critical inthe prediction of the quality of user experience for video streaming based ondevice and network-level metrics. Quantum support vector machine (QSVM)is the quantum analogue of the classical support vector machine algorithm,which utilizes the properties of quantum computers to exponentially speed upthe algorithm. This thesis provides an implementation of the QSVMclassificationsystem and its fundamental components, the quantum Fourier transfor
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Patino, Alberto. "Reversible Logic Synthesis Using a Non-blocking Order Search." PDXScholar, 2010. https://pdxscholar.library.pdx.edu/open_access_etds/162.

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Reversible logic is an emerging area of research. With the rapid growth of markets such as mobile computing, power dissipation has become an increasing concern for designers (temperature range limitations, generating smaller transistors) as well as customers (battery life, overheating). The main benefit of utilizing reversible logic is that there exists, theoretically, zero power dissipation. The synthesis of circuits is an important part of any design cycle. The circuit used to realize any specification must meet detailed requirements for both layout and manufacturing. Quantum cost is the mai
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Dodd, Jennifer L. "Universality in quantum computation /." [St. Lucia, Qld], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18197.pdf.

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Block, Aaron. "Quantum computation an introduction /." Diss., Connect to the thesis, 2002. http://hdl.handle.net/10066/1468.

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Green, Alexander S. "Towards a formally verified functional quantum programming language." Thesis, University of Nottingham, 2010. http://eprints.nottingham.ac.uk/11457/.

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This thesis looks at the development of a framework for a functional quantum programming language. The framework is first developed in Haskell, looking at how a monadic structure can be used to explicitly deal with the side-effects inherent in the measurement of quantum systems, and goes on to look at how a dependently-typed reimplementation in Agda gives us the basis for a formally verified quantum programming language. The two implementations are not in themselves fully developed quantum programming languages, as they are embedded in their respective parent languages, but are a major step to
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Wilson, Frederick Wilson. "Simulating atomic-scale dopant placement for a solid-state quantum computer." Thesis, The University of Sydney, 2006. https://hdl.handle.net/2123/28160.

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A quantum computer is a device which exploits quantum mechanics to per— form calculations which would be impractical using ordinary classical means. Fabrication of a large—scale quantum computer would drastically expand the scope of possible calculations, and is seen as one of the most important technological challenges of the near future. While a wide variety of different quan— tum computing architectures have been proposed, one particularly promising scheme due to Bruce Kane has attracted a great deal of experimental and theoretical attention, due to its scalability and use of conventiona
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Li, Huidong, and 李輝東. "The reversibility and determinism in quantum computing." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B31228306.

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Al, Baity Heyam. "A quantum behaved particle swarm approach to multi-objective optimization." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/5857/.

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Many real-world optimization problems have multiple objectives that have to be optimized simultaneously. Although a great deal of effort has been devoted to solve multi-objective optimization problems, the problem is still open and the related issues still attract significant research efforts. Quantum-behaved Particle Swarm Optimization (QPSO) is a recently proposed population based metaheuristic that relies on quantum mechanics principles. Since its inception, much effort has been devoted to develop improved versions of QPSO designed for single objective optimization. However, many of its adv
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Güney, Durdu. "Novel photonic bandgap based architectures for quantum computers and networks." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2007. http://wwwlib.umi.com/cr/ucsd/fullcit?p3288844.

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Thesis (Ph. D.)--University of California, San Diego, 2007.<br>Title from first page of PDF file (viewed February 5, 2008). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 108-114).
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Wu, Xin [Verfasser]. "Semiempirical Quantum Chemistry on High-Performance Heterogeneous Computers / Xin Wu." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2014. http://d-nb.info/1047440539/34.

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Ratanje, Nikhil. "The classical simulation of noisy quantum computers : a polyhedral approach." Thesis, University of Strathclyde, 2017. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=27945.

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In this thesis we explored the consequences of considering generalised non-quantum notions of entanglement in the classical simulation of noisy quantum computers where the available measurements are restricted. Such noise rates serve as upper bounds to fault tolerance thresholds. These measurement restrictions come about either through imperfection, and/or by design to some limited set. By considering sets of operators that return positive measurement outcome probabilities for the restricted measurements, one can construct new single particle state spaces containing quantum and non-quantum ope
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Kramnik, Danielius. "Scaling trapped-ion quantum computers with CMOS-integrated state readout." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/129912.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, February, 2020<br>Cataloged from student-submitted PDF of thesis.<br>Includes bibliographical references (pages 155-164).<br>Quantum information processing (QIP) has emerged as a powerful new computing paradigm as traditional Moore's law scaling slows due to skyrocketing costs of shrinking feature sizes, interconnects becoming the dominant source of energy consumption and delay as transistor critical dimensions fall below 10 nm, and power density limiting the activity factor in di
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Testolin, Matthew James. "Realistic read-out and control for Si:P based quantum computers /." Connect to thesis, 2008. http://repository.unimelb.edu.au/10187/2805.

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Dixon, Alexander Robert. "High speed and actively stabilised quantum key distribution." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609865.

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Edmunds, Claire Louise. "Error characterisation and reduction in trapped ion quantum computers - One Woman’s Guide to the Ion-ing." Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/25668.

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For the field of quantum computing and technology to continue its growth and begin to solve truly useful problems, it must overcome the limitations imposed by errors affecting quantum devices. Leading modern devices can be classed as “noisy intermediate-scale quantum” or NISQ devices. These are devices that have not realised fault-tolerance nor utilise error correction, but nonetheless could solve genuinely useful, classically intractable problems. However, the scalability and reliability of current NISQ devices is limited by the impact of errors. This thesis uses the principles of quantum con
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Mades, John E. "Quantum computers and their impact on DoD in the 21st century." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1999. http://handle.dtic.mil/100.2/ADA371045.

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Thesis (M.S. in Computer Science) Naval Postgraduate School, September 1999.<br>"September 1999". Thesis advisor(s): Neil C. Rowe, Wolfgang Baer. Includes bibliographical references (p. 53-54). Also Available online.
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Chasseur, Tobias [Verfasser], and Frank [Akademischer Betreuer] Wilhelm-Mauch. "Errors in scalable quantum Computers / Tobias Chasseur ; Betreuer: Frank Wilhelm-Mauch." Saarbrücken : Saarländische Universitäts- und Landesbibliothek, 2019. http://d-nb.info/1190085674/34.

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48

Shah, Dipal. "Design of Regular Reversible Quantum Circuits." PDXScholar, 2010. https://pdxscholar.library.pdx.edu/open_access_etds/129.

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The computing power in terms of speed and capacity of today's digital computers has improved tremendously in the last decade. This improvement came mainly due to a revolution in manufacturing technology by developing the ability to manufacture smaller devices and by integrating more devices on a single die. Further development of the current technology will be restricted by physical limits since it won't be possible to shrink devices beyond a certain size. Eventually, classical electrical circuits will encounter the barrier of quantum mechanics. The laws of quantum mechanics can be used for bu
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Huertas-Rosero, Alvaro Francisco. "Lexical measurements for information retrieval : a quantum approach." Thesis, University of Glasgow, 2011. http://theses.gla.ac.uk/2697/.

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The problem of determining whether a document is about a loosely defined topic is at the core of text Information Retrieval (IR). An automatic IR system should be able to determine if a document is likely to convey information on a topic. In most cases, it has to do it solely based on measure- ments of the use of terms in the document (lexical measurements). In this work a novel scheme for measuring and representing lexical information from text documents is proposed. This scheme is inspired by the concept of ideal measurement as is described by Quantum Theory (QT). We apply it to Information
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Dallaire-Demers, Pierre-Luc [Verfasser], та Frank K. [Akademischer Betreuer] Wilhelm-Mauch. "Quantum simulation of superconductors on quantum computers : toward the first applications of quantum processors / Pierre-Luc Dallaire-Demers ; Betreuer: Frank K. Wilhelm-Mauch". Saarbrücken : Saarländische Universitäts- und Landesbibliothek, 2016. http://d-nb.info/1116344599/34.

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