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Dissertations / Theses on the topic 'Quantum communication systems'

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1

Zhang, Zheshen. "New techniques for quantum communication systems." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42843.

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Although mathematical cryptography has been widely used, its security has only been proven under certain assumptions such as the computational power of opponents. As an alternative, quantum communication, in particular quantum key distribution (QKD) can get around unproven assumptions and achieve unconditional security. However, the key generation rate of practical QKD systems is limited by device imperfections, excess noise from the quantum channel, limited rate of true random-number generation, quantum entanglement preparation, and/or post-processing efficiency. This dissertation contributes
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2

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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3

Antonio, R. G. "Quantum computation and communication in strongly interacting systems." Thesis, University College London (University of London), 2015. http://discovery.ucl.ac.uk/1469437/.

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Each year, the gap between theoretical proposals and experimental endeavours to create quantum computers gets smaller, driven by the promise of fundamentally faster algorithms and quantum simulations. This occurs by the combination of experimental ingenuity and ever simpler theoretical schemes. This thesis comes from the latter perspective, aiming to find new, simpler ways in which components of a quantum computer could be built. We first search for ways to create quantum gates, the primitive building blocks of a quantum computer. We find a novel, low-control way of performing a two-qubit gate
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4

Lou, Hanqing. "LDGM codes for wireless and quantum systems." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 3.92 Mb., 138 p, 2006. http://wwwlib.umi.com/dissertations/fullcit?3220802.

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5

Rodó, Sarró Carles. "Quantum Information with Continuous Variable systems." Doctoral thesis, Universitat Autònoma de Barcelona, 2010. http://hdl.handle.net/10803/3426.

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Aquesta tesi tracta l'estudi de protocols de comunicació quàntica amb sistemes devariable continua (CV). Els sistemes de CV són aquells descrits per coordenades canòniques conjugades $x$ i $p$ dotades amb un espai de Hilbert de dimensió in&#64257;nita. Una classe especial de sistemes CV són, els anomenats estats Gaussians.Contràriament als sistemes discrets, els estats Gaussians entrellaçats no es podendestil·lar només amb operacions Gaussianes. No obstant va ser mostrat que, és possible extreure bits clàssics perfectament correlacionats per establir claus secretes aleatòries. Apropiadament mo
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6

Tsang, Hon Ki. "Optical nonlinearities in quantum well waveguides." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385896.

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7

Rosati, Matteo. "Decoding protocols for classical communication on quantum channels." Doctoral thesis, Scuola Normale Superiore, 2017. http://hdl.handle.net/11384/85834.

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8

Quinn, Niall. "Gaussian non-classical correlations in bipartite dissipative continuous variable quantum systems." Thesis, University of St Andrews, 2015. http://hdl.handle.net/10023/6915.

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This thesis probes the usefulness of non-classical correlations within imperfect continuous variable decoherent quantum systems. Although a consistent function and practical usefulness of these correlations is largely unknown, it is important to examine their characteristics in more realistic dissipative systems, to gain further insight into any possible advantageous behaviour. A bipartite separable discordant state under the action of controlled loss on one subsystem was considered. Under these conditions the Gaussian quantum discord not only proved to be robust against loss, but actually imp
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9

Jogenfors, Jonathan. "Breaking the Unbreakable : Exploiting Loopholes in Bell’s Theorem to Hack Quantum Cryptography." Doctoral thesis, Linköpings universitet, Informationskodning, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-140912.

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In this thesis we study device-independent quantum key distribution based on energy-time entanglement. This is a method for cryptography that promises not only perfect secrecy, but also to be a practical method for quantum key distribution thanks to the reduced complexity when compared to other quantum key distribution protocols. However, there still exist a number of loopholes that must be understood and eliminated in order to rule out eavesdroppers. We study several relevant loopholes and show how they can be used to break the security of energy-time entangled systems. Attack strategies are
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10

Li, Ling Feng. "An image encryption system based on two-dimensional quantum random walks." Thesis, University of Macau, 2018. http://umaclib3.umac.mo/record=b3950660.

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11

Jabbour, Michael. "Bosonic systems in quantum information theory: Gaussian-dilatable channels, passive states, and beyond." Doctoral thesis, Universite Libre de Bruxelles, 2018. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/272099.

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The symplectic formalism applied to the phase-space representation of bosonic quantum systems provides us with a powerful mathematical tool for the characterisation of Gaussian states and transformations. As a consequence, quantum information protocols involving the latter are very well understood from a theoretical point of view. Nevertheless, it has become clear in recent years that the use of non-Gaussian resources is necessary in order to perform various crucial information-processing tasks. An illustration of this fact can for instance be found in situations where a Gaussian no-go theorem
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12

Eriksson, Hampus. "Implementing and Evaluating the Quantum Resistant Cryptographic Scheme Kyber on a Smart Card." Thesis, Linköpings universitet, Informationskodning, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-169039.

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Cyber attacks happen on a daily basis, where criminals can aim to disrupt internet services or in other cases try to get hold of sensitive data. Fortunately, there are systems in place to protect these services. And one can rest assured that communication channels and data are secured under well-studied cryptographic schemes. Still, a new class of computation power is on the rise, namely quantum computation. Companies such as Google and IBM have in recent time invested in research regarding quantum computers. In 2019, Google announced that they had achieved quantum supremacy. A quantum compute
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13

Narváez, Castañeda Emmanuel. "Elliptical Vortex Beams Through Turbulent Atmosphere." University of Dayton / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1608232137775185.

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14

Hameedi, Muhammad Alley. "Single Photon Sources and Single Quantum System enabled Communication." Doctoral thesis, Stockholms universitet, Fysikum, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-139095.

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Quantum information is a highly interesting and fast emerging field that involves processing information encoded into quantum systems and their subsequent use in various information tasks. The use of quantum resources such as superposition and entanglement have shown to enhance information processing capabilities beyond classical means in a number of communication, information and computation tasks. In this thesis, we have used single photons to study the advantage of d-level quantum systems (qudits) for a communication task commonly known as random access codes (RACs). A successful experiment
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15

Lekki, John Daniel. "Quantum optical communications system for micro robots." Diss., Connect to online resource - MSU authorized users, 2008.

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Thesis (Ph.D.)--Michigan State University. Dept. of Electrical and Computer Engineering, 2008.<br>Title from PDF t.p. (viewed on July 23, 2009) Includes bibliographical references (p. 177-181). Also issued in print.
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16

GUERRINI, Stefano. "Quantum Communications: State Characterization and System Design." Doctoral thesis, Università degli studi di Ferrara, 2021. http://hdl.handle.net/11392/2488171.

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Quantum information science is essential in the development of future-generation networks for a variety of new applications in the quantum domain involving sensing, cryptography, computing, and networking. The supremacy of quantum technologies relies on the exploitation of unique properties in quantum mechanics, such as superposition, entanglement, and indeterminacy. This calls for the design of communication systems and networks able to unleash the full potentialities of quantum mechanics. The design of quantum communication systems and networks poses new challenges compared to classical ones
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17

Szabo, Florian Akos. "Modelling of secure communication system for IoT enabled waste management system." Thesis, Luleå tekniska universitet, Datavetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-76028.

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Urban expansion is a key driving force of our modern world. Increasing environmental footprint is an example issue that is directly caused by it. The city of St. Petersburg employs on average almost 500 garbage trucks on a daily basis and spends more than 1 million US Dollars every year to collect, process and manage waste. In order for megacities, such as St. Petersburg, to cope with its effects, new ideas are needed. This seems to be an obvious area in which technology can be used to improve current practices and help save resources. In this study, we investigate how the Internet of Things,
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18

Killey, Robert Ian. "InGaAsP multiple-quantum well Fabry-Perot optical modulators for soliton systems at #lambda# = 1.55 #mu#m." Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244527.

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19

Poizat, Jean-Philippe. "Réalisation et caractérisation de mesures quantiques non-destructives en optique." Phd thesis, Université Paris Sud - Paris XI, 1993. http://pastel.archives-ouvertes.fr/pastel-00714222.

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L'objectif d'un dispositif de mesure qnd est de contrôler l'action en retour, imposée par la mécanique quantique, qui se produit sur un système soumis a une mesure. Il est, en effet, possible de rejeter cette perturbation entièrement sur l'observable complémentaire de celle mesurée, laissant cette dernière inchangées. Nous présentons ici, de manière détaillée, un ensemble de critères quantitatifs permettant d'évaluer les performances d'un dispositif mesurant l'intensité d'un faisceau lumineux. Ces critères permettent en particulier de séparer clairement des domaines classique et quantique de f
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20

Yu, Shuqi. "Semiconductor optical amplifiers for future telecom system." Electronic Thesis or Diss., Institut polytechnique de Paris, 2024. http://www.theses.fr/2024IPPAS006.

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L'augmentation continue de la demande de transmission de données contraint les réseaux optiques à évoluer et à améliorer leur capacité de transmission. Comme l'efficacité spectrale des fibres optiques semble avoir atteint sa limite, l'une des meilleures solutions consiste à étendre la largeur de bande spectrale des systèmes optiques. Compte tenu de la demande de systèmes d'amplification optique à large bande passante, nous avons décidé de mener des recherches sur les amplificateurs optiques à semiconducteurs (SOA) car ils offrent un gain personnalisé et une expansion flexible de la bande passa
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21

Hjern, Gunnar. "The modernization of a DOS-basedtime critical solar cell LBICmeasurement system." Thesis, Karlstads universitet, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-74322.

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LBIC is a technique for scanning the local quantum efficiency of solar cells. This kind of measurements needs a highly specialized, and time critical controlling software. In 1996 the client, professor Markus Rinio, constructed an LBIC system, and wrote the controlling software as a Turbo-Pascal 7.0 application, running under the MS-DOS 6.22 operating system. By now (2018) both the software and several hardware components are in dire need to be modernized. This thesis thoroughly describes several important aspects of this work, and the considerations needed for a successful result. This includ
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22

Jeffrey, Evan Robert. "Advanced quantum communication systems /." 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3290258.

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Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007.<br>Source: Dissertation Abstracts International, Volume: 68-11, Section: B, page: 7406. Adviser: Paul Kwiat. Includes bibliographical references (leaves 62-66) Available on microfilm from Pro Quest Information and Learning.
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23

D'Ambrosio, Vincenzo. "Photonic high dimensional systems and their applications in fundamental quantum mechanics, quantum information and quantum communication." Doctoral thesis, 2014. http://hdl.handle.net/11573/918001.

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24

(10723737), Navin Bhartoor Lingaraju. "Spectral Multiplexing and Information Processing for Quantum Networks." Thesis, 2021.

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Modern fiber-optic networks leverage massive parallelization of communications channels in the spectral domain, as well as low-noise recovery of optical signals, to achieve high rates of information transfer. However, quantum information imposes additional constraints on optical transport networks – the no-cloning theorem forbids use of signal regeneration and many network protocols are premised on operations like Bell state measurements that prize spectral indistinguishability. Consequently, a key challenge for quantum networks is identifying a path to high-rate and high-fidelity quantum stat
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25

Rodríguez, Santiago Agustín. "Transmisión de estados cuánticos en cadenas de espines con dinámica Liouviliana exacta." Bachelor's thesis, 2018. http://hdl.handle.net/11086/6347.

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Tesis (Lic. en Física)--Universidad Nacional de Córdoba, Facultad de Matemática, Astronomía, Física y Computación, 2018.<br>Se estudia la posibilidad de definir un protocolo de transmisión que permita enviar de forma fidedigna estados cuánticos por medio de cadenas de spines "boundary controlled''(BC) o cadenas controladas por los bordes y cadenas de transmisión perfecta o "Perfect state transfer''(PST), bajo el marco de evolución dinámica de la ecuación de Lindblad en forma de Tercera Cuantización. Se estudiara el comportamiento de la magnetización y las funciones de correlación de spin en
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26

Frazão, João Carlos dos Reis. "Quantum communications system using qubits with polarization encoding." Master's thesis, 2020. http://hdl.handle.net/10316/92563.

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Trabalho de Projeto do Mestrado Integrado em Engenharia Física apresentado à Faculdade de Ciências e Tecnologia<br>Compreende-se criptografia como a prática de princípios e técnicas que permitem uma comunicação segura, na presença de terceiros. Com o desenvolvimento dos computadores quânticos, a utilização de um algoritmo quântico muito eficiente (algoritmo de Shor) para atacar a atual criptografia assimétrica pode transformar-se numa realidade. Isso comprometeria a segurança dos sistemas atuais e futuras trocas de informações. Nesta dissertação, é estudada uma implementação do protocolo quânt
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