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Relevant bibliographies by topics / Quantum communication Cryptography / Dissertations / Theses

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Dissertations / Theses on the topic 'Quantum communication Cryptography'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Lunemann, Carolin. "Quantum cryptography : security analysis of multiuser quantum communication with embedded authentication." Master's thesis, Universität Potsdam, 2006. http://opus.kobv.de/ubp/volltexte/2007/1275/.

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Three quantum cryptographic protocols of multiuser quantum networks with embedded authentication, allowing quantum key distribution or quantum direct communication, are discussed in this work. The security of the protocols against different types of attacks is analysed with a focus on various impersonation attacks and the man-in-the-middle attack. On the basis of the security analyses several improvements are suggested and implemented in order to adjust the investigated vulnerabilities. Furthermore, the impact of the eavesdropping test procedure on impersonation attacks is outlined. The framew

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2

Rafiei, Nima. "Quantum Communication Networks." Thesis, Stockholms universitet, Fysikum, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-186606.

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Quantum communication protocols invoke one of the most fundamentallaws of quantum mechanics, namely the superposition principle whichleads to the no-cloning theorem. During the last three decades, quantumcryptography have gone from prospective theories to practical implementationsscalable for real communication. Scientist from all over the world havecontributed to this major progress, starting from Stephen Wiesner, CharlesH. Bennett and Gilles Brassard who all developed the theory of QuantumKey Distribution (QKD). QKD lets two users share a key through a quantumchannel (free space or fiber lin

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3

Lan, Shau-Yu. "Matter-light entanglement with cold." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/28197.

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Thesis (M. S.)--Physics, Georgia Institute of Technology, 2009.<br>Committee Chair: Kuzmich, Alex; Committee Member: Chapman, Michael; Committee Member: Citrin, David; Committee Member: Kennedy, T. A. Brian; Committee Member: Raman, Chandra

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4

Matsukevich, Dzmitry. "Quantum networking with atomic ensembles." Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-07072006-173336/.

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Thesis (Ph. D.)--Physics, Georgia Institute of Technology, 2007.<br>Kennedy, Brian, Committee Member ; Chapman, Michael, Committee Member ; Kuzmich, Alex, Committee Chair ; Raman, Chandra, Committee Member ; Voss, Paul, Committee Member.

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5

Boström, Kim. "Lossless quantum data compression and secure direct communication." Phd thesis, Universität Potsdam, 2004. http://opus.kobv.de/ubp/volltexte/2005/100/.

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Diese Dissertation behandelt die Kodierung und Verschickung von Information durch einen Quantenkanal. Ein Quantenkanal besteht aus einem quantenmechanischen System, welches vom Sender manipuliert und vom Empfänger ausgelesen werden kann. Dabei repräsentiert der individuelle Zustand des Kanals die Nachricht. <br /> <br /> Die zwei Themen der Dissertation umfassen 1) die Möglichkeit, eine Nachricht in einem Quantenkanal verlustfrei zu komprimieren und 2) die Möglichkeit eine Nachricht von einer Partei zu einer einer anderen direkt und auf sichere Weise zu übermitteln, d.h. ohne dass es einer dri

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6

Sit, Alicia. "Quantum Communication: Through the Elements: Earth, Air, Water." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39648.

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This thesis encompasses a body of experimental work on the use of structured light in quantum cryptographic protocols. In particular, we investigate the ability to perform quantum key distribution through various quantum channels (fibre, free-space, underwater) in laboratory and realistic conditions. We first demonstrate that a special type of optical fibre (vortex fibre) capable of coherently transmitting vector vortex modes is a viable quantum channel. Next, we describe the first demonstration of high-dimensional quantum cryptography using structured photons in an urban setting. In particula

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7

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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8

Zhang, Zheshen. "Quantum key distribution protocols with high rates and low costs." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28240.

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9

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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10

Rödiger, Jasper. "Time-Frequency Quantum Key Distribution: Numerical Assessment and Implementation over a Free-Space Link." Doctoral thesis, Humboldt-Universität zu Berlin, 2020. http://dx.doi.org/10.18452/21046.

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Die Quantenschlüsselverteilung (QKD), die erste anwendbare Quantentechnologie, verspricht informationstheoretisch sichere Kommunikation. In der vorliegenden Arbeit wurde das Zeit-Frequenz (TF)-QKD-Protokoll untersucht, das Zeit und Frequenz, nämlich Puls-Positionsmodulation (PPM) im Zeitbereich und Frequenzumtastung (FSK) im Frequenzbereich als die beiden komplementären Basen verwendet. Seine Sicherheit beruht den Quanteneigenschaften von Licht und auf der Zeit-Frequenz-Unschärferelation. TF-QKD kann mit größtenteils Standard-Telekommunikationstechnologie im 1550-nm-Band implementiert werd

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11

Qin, Hao. "Sécurité pratique de systèmes de cryptographie quantique : étude d'attaques et développement de contre-mesures." Electronic Thesis or Diss., Paris, ENST, 2015. http://www.theses.fr/2015ENST0040.

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Dans cette thèse, j’étudie une primitive cryptographique appelée distribution quantique de clés. La distribution quantique de clés permet à deux parties distantes de partager une clé secrète en présence d’une espion, dont la puissance est seulement limité par les lois de la physique quantique. J’ai concentré mon travail de thèse sur la distribution quantique de clés à variables continues et en particulier, sur l’étude pratique d’implémentations. J’ai proposé et étudié théoriquement une attaque par canaux cachés originale, visant les détecteurs : l’attaque par saturation. Nous avons de plus dém

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12

Carneiro, Steven Ramos. "Secure communications based on quantum cryptography." Master's thesis, Universidade de Aveiro, 2010. http://hdl.handle.net/10773/9771.

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Mestrado em Engenharia Física<br>No trabalho apresentado, estudamos criptografia quântica, nomeadamente formas de geração, transmissão e detecção de pares de fotões entrelaçados. Para uma melhor compreensão dos processos e fenómenos que estão na sua base, abordamos o paradoxo de Einstein, Podolsky e Rosen (EPR) e a teoria de Bell. Estas teorias possibilitaram-nos investigar sobre a natureza física, local ou não local a nível quântico, tendo sido as respostas obtidas essenciais para a segurança e confidencialidade na transmissão de dados. Depois, exploramos os vários tipos de processos d

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13

Makarov, Vadim. "Quantum cryptography and quantum cryptanalysis." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1473.

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<p>This doctoral thesis summarizes research in quantum cryptography done at the Department of Electronics and Telecommunications at the Norwegian University of Science and Technology (NTNU) from 1998 through 2007.</p><p>The opening parts contain a brief introduction into quantum cryptography as well as an overview of all existing single photon detection techniques for visible and near infrared light. Then, our implementation of a fiber optic quantum key distribution (QKD) system is described. We employ a one-way phase coding scheme with a 1310 nm attenuated laser source and a polarization-main

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14

Leifgen, Matthias. "Protocols and components for quantum key distribution." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2016. http://dx.doi.org/10.18452/17473.

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In dieser Doktorarbeit werden zwei Konzepte der Quanteninformationsverarbeitung realisiert. Der Quantenschlüsselaustausch ist revolutionär, weil er perfekte Sicherheit gewährleistet. Zahlreiche Quantenkryptografieprotokolle wurden schon untersucht. Zwei Probleme bestehen. Zum einen ist es sehr schwer, die Bedingungen herzustellen, die in den Annahmen für perfekte Sicherheit impliziert sind. Zum anderen sind die Reichweiten auf momentan etwa 200 km begrenzt, aufgrund des abnehmenden Signals gegenüber des konstanten Rauschens. Ein Experiment dieser Doktorarbeit beschäftigt sich mit dem ersten P

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15

Lamoureux, Louis-Philippe. "Theoretical and experimental aspects of quantum cryptographic protocols." Doctoral thesis, Universite Libre de Bruxelles, 2006. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210776.

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La mécanique quantique est sans aucun doute la théorie la mieux vérifiée qui n’a jamais existée. En se retournant vers le passé, nous constatons qu’un siècle de théorie quantique a non seulement changé la perception que nous avons de l’univers dans lequel nous vivons mais aussi est responsable de plusieurs concepts technologiques qui ont le potentiel de révolutionner notre monde.<p> <p>La présente dissertation a pour but de mettre en avance ces potentiels, tant dans le domaine théorique qu’expérimental. Plus précisément, dans un premier temps, nous étudierons des protocoles de communication qu

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16

Autebert, Claire. "AlGaAs photonic devices : from quantum state generation to quantum communications." Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCC166/document.

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Un des plus grands challenges dans le domaine de l’information quantique est la génération, manipulation et détection de plusieurs qubits sur des micro-puces. On assiste ainsi à un véritable essor des technologies pour l’information quantique et pour transmettre l’information, les photons ont un grand avantage sur les autres systèmes, grâce à leur grande vitesse et leur immunité contre la décohérence.Mon travail de thèse porte sur la conception, fabrication et caractérisation d’une source de photons intriqués en matériaux semiconducteurs d’une très grande compacité. Ce dispositif fonctionne à

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17

Ly, Aliou. "Développement d’un oscillateur paramétrique optique continu intense et à faible bruit pour des applications aux communications quantiques." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS528/document.

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La portée des communications quantiques est limitée à quelques dizaines de km en raison de l’atténuation dans les fibres. Les répéteurs quantiques (relais quantiques synchronisés par des mémoires quantiques photoniques) furent introduits afin d’accroître ces distances. Or, pour le moment, les mémoires les plus performantes fonctionnent à des longueurs d’onde n’appartenant pas à la bande C télécom. Afin de profiter de ces mémoires, l’utilisation d’interfaces quantiques (milieu non linéaire quadratique) fut proposée comme alternative. En ajoutant ainsi par somme de fréquences un photon de pompe

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18

Erven, Christopher. "On Experimental Quantum Communication and Cryptography." Thesis, 2012. http://hdl.handle.net/10012/6595.

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One of the most fascinating recent developments in research has been how different disciplines have become more and more interconnected. So much so that fields as disparate as information theory and fundamental physics have combined to produce ideas for the next generation of computing and secure information technologies, both of which have far reaching consequences. For more than fifty years Moore's law, which describes the trend of the transistor's size shrinking by half every two years, has proven to be uncannily accurate. However, the computing industry is now approaching a fundamental bar

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19

Zhao, Yi. "Quantum Cryptography in Rreal-life Applications: Assumptions and Security." Thesis, 2009. http://hdl.handle.net/1807/19307.

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Quantum cryptography, or quantum key distribution (QKD), provides a means of unconditionally secure communication. The security is in principle based on the fundamental laws of physics. Security proofs show that if quantum cryptography is appropriately implemented, even the most powerful eavesdropper cannot decrypt the message from a cipher. The implementations of quantum crypto-systems in real life may not fully comply with the assumptions made in the security proofs. Such discrepancy between the experiment and the theory can be fatal to the security of a QKD system. In this thesis we addre

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20

Meyer-Scott, Evan. "Experimental quantum communication in demanding regimes." Thesis, 2011. http://hdl.handle.net/10012/6052.

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Quantum communication promises to outperform its classical counterparts and enable protocols previously impossible. Specifically, quantum key distribution (QKD) allows a cryptographic key to be shared between distant parties with provable security. Much work has been performed on theoretical and experi- mental aspects of QKD, and the push is on to make it commercially viable and integrable with existing technologies. To this end I have performed simulations and experiments on QKD and other quantum protocols in regimes previously unexplored. The first experiment involves QKD via distributed ent

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21

Beaudry, Normand James. "Squashing Models for Optical Measurements in Quantum Communication." Thesis, 2009. http://hdl.handle.net/10012/4800.

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Many protocols and experiments in quantum information science are described in terms of simple measurements on qubits. However, in an experimental implementation, the exact description of the measurement is usually more complicated. If there is a claim made from the results of an experiment by using the simplified measurement description, then do the claims still hold when the more realistic description is taken into account? We present a "squashing" model that decomposes the realistic measurement description into first a map, followed by a simplified measurement. The squashing model then prov

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22

Gigov, Nikolay. "Quantum Key Distribution Data Post-Processing with Limited Resources: Towards Satellite-Based Quantum Communication." Thesis, 2013. http://hdl.handle.net/10012/7244.

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Quantum key distribution (QKD), a novel cryptographic technique for secure distribution of secret keys between two parties, is the first successful quantum technology to emerge from quantum information science. The security of QKD is guaranteed by fundamental properties of quantum mechanical systems, unlike public-key cryptography whose security depends on difficult to solve mathematical problems such as factoring. Current terrestrial quantum links are limited to about 250 km. However, QKD could soon be deployed on a global scale over free-space links to an orbiting satellite used as a trusted

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23

Pereira, Maria Ana de Matos Afonso. "Experimental Semi-Device Independent Quantum Key Distribution." Master's thesis, 2020. http://hdl.handle.net/10316/92115.

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Trabalho de Projeto do Mestrado Integrado em Engenharia Física apresentado à Faculdade de Ciências e Tecnologia<br>The goal of quantum key distribution is to safely transfer secret data between two legitimate users through an unreliable network. This is done so by exploiting the properties of quantum mechanics. The security proofs of standard quantum key distribution protocols rely heavily on the characterization of the measurements and prepared quantum states. These assumptions, however, prove to be difficult to meet in real-life implementations. The obvious solution would come as device-inde

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24

Lapointe, Rébecca. "Complexité de la communication sur un canal avec délai." Thèse, 2014. http://hdl.handle.net/1866/10686.

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Nous introduisons un nouveau modèle de la communication à deux parties dans lequel nous nous intéressons au temps que prennent deux participants à effectuer une tâche à travers un canal avec délai d. Nous établissons quelques bornes supérieures et inférieures et comparons ce nouveau modèle aux modèles de communication classiques et quantiques étudiés dans la littérature. Nous montrons que la complexité de la communication d’une fonction sur un canal avec délai est bornée supérieurement par sa complexité de la communication modulo un facteur multiplicatif d/ lg d. Nous présentons ensuite quelqu

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25

"Quantum cryptography and applications in the optical fiber network." Thesis, 2005. http://library.cuhk.edu.hk/record=b6073966.

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In this thesis research, a novel scheme to implement quantum key distribution based on multiphoton entanglement with a new protocol is proposed. Its advantages are: a larger information capacity can be obtained with a longer transmission distance and the detection of multiple photons is easier than that of a single photon. The security and attacks pertaining to such a system are also studied.<br>Lastly, a quantum random number generator based on quantum optics has been experimentally demonstrated. This device is a key component for quantum key distribution as it can create truly random numbers

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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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