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Dissertations / Theses on the topic 'Quantum key distribution (QKD)'

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Published: 4 June 2021
Last updated: 26 July 2025

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1

Gariano, John, and Ivan B. Djordjevic. "PPLN-waveguide-based polarization entangled QKD simulator." SPIE-INT SOC OPTICAL ENGINEERING, 2017. http://hdl.handle.net/10150/626494.

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We have developed a comprehensive simulator to study the polarization entangled quantum key distribution (QKD) system, which takes various imperfections into account. We assume that a type-II SPDC source using a PPLN-based nonlinear optical waveguide is used to generate entangled photon pairs and implements the BB84 protocol, using two mutually unbiased basis with two orthogonal polarizations in each basis. The entangled photon pairs are then simulated to be transmitted to both parties; Alice and Bob, through the optical channel, imperfect optical elements and onto the imperfect detector. It i
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2

BARI, INAM. ""Soft Decoding Techniques for Quantum Key Distribution (QKD) and Weak Energy Optical Communication"." Doctoral thesis, Politecnico di Torino, 2014. http://hdl.handle.net/11583/2531893.

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The focus of this research activity is to work on pragmatic information reconciliation applied to QKD schemes based on single photon or weak pulse laser (WPL) sources, so as to use feed-forward techniques which minimize the interaction between transmitter and receiver. The core ideas of the thesis are employing Forward Error Correction (FEC) coding as opposed to two-way communication for information reconciliation in QKD schemes, exploiting all the available information for data processing at the receiver including information available from the quantum channel, since optimized use of this inf
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Marulanda, Acosta Valentina. "Quantum Key Distribution through atmospheric turbulence : secure satellite-to-ground links." Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS378.

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Les exigences sans cesse croissantes des systèmes de télécommunication modernes en termes de débit, ainsi que la menace imminente que pose l’augmentation de la puissance de calcul des ordinateurs modernes sur les méthodes cryptographiques actuelles, font de la transmission sécurisée des données à la fois une exigence essentielle et un grand défi, et donc un domaine d'étude très actif. La distribution quantique des clés (QKD) permet l'échange de clés cryptographiques dont le niveau de sécurité ne dépend pas de la complexité d'un algorithme mathématique mais repose intrinsèquement sur l'exploita
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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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5

Cusini, Gabriele. "Quantum Key Distribution with Continuous Variables for Satellite Systems." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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Recenti studi hanno dimostrato come i più avanzati algoritmi per la generazione e scambio di chiavi crittografiche risultino insicuri contro la futura enorme capacità computazionale dei computer quantistici. Come è possibile ottenere una chiave completamente sicura, assumendo che i computer quantistici possano rendere i protocolli attuali insicuri? Una possibile soluzione consiste nell'impiego di protocolli come il Quantum Key Distribution (QKD) il quale usa un sistema di comunicazione quantistica per lo scambio della chiave. Tale sistema garantisce la segretezza della chiave in virtù delle
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Woodhead, Erik. "Imperfections and self testing in prepare-and-measure quantum key distribution." Doctoral thesis, Universite Libre de Bruxelles, 2014. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209185.

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Quantum key distribution (QKD) protocols are intended to allow cryptographic keys to be generated and distributed in way that is provably secure based on inherent limitations, such as the no-cloning principle, imposed by quantum mechanics. This unique advantage compared with classical cryptography comes with an added difficulty: key bits in QKD protocols are encoded in analogue quantum states and their preparation is consequently subject to the usual imprecisions inevitable in any real world experiment. The negative impact of such imprecisions is illustrated for the BB84 QKD protocol. Followin
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7

Qu, Zhen, and Ivan B. Djordjevic. "High-speed continuous-variable quantum key distribution over atmospheric turbulent channels." SPIE-INT SOC OPTICAL ENGINEERING, 2017. http://hdl.handle.net/10150/626486.

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We experimentally demonstrate a RF-assisted four-state continuous-variable quantum key distribution (CV-QKD) system in the presence of turbulence. The atmospheric turbulence channel is emulated by two spatial light modulators (SLMs) on which two randomly generated azimuthal phase patterns are recorded yielding Andrews' azimuthal phase spectrum. Frequency and phase locking are not required in our system thanks to the proposed digital phase noise cancellation (PNC) stage. Besides, the transmittance fluctuation can be monitored accurately by the DC level in this PNC stage, which is free of post-p
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8

Širjov, Jakub. "Testovací polygon pro kvantovou distribuci klíčů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442371.

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The aim of this masters thesis is to explain quantum key distribution (QKD) and principle of signal transmission in the quantum channel. Further this thesis complains commercial distributors of QKD technologies and their individual appliances. Practical part of the thesis is separated to 3 parts. First part handles transmission of quantum keys in QKDNetsim simulator. Second part takes care of design and creation of a test polygon that allows for testing of many optical network configurations with quantum signal and normal data traffic being transmitted in a single fiber. Multiple simulations o
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9

Gariano, John, and Ivan B. Djordjevic. "Multimode entanglement assisted QKD through a free-space maritime channel." SPIE-INT SOC OPTICAL ENGINEERING, 2017. http://hdl.handle.net/10150/626495.

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When using quantum key distribution (QKD), one of the trade-offs for security is that the generation rate of a secret key is typically very low. Recent works have shown that using a weak coherent source allows for higher secret key generation rates compared to an entangled photon source, when a channel with low loss is considered. In most cases, the system that is being studied is over a fiber-optic communication channel. Here a theoretical QKD system using the BB92 protocol and entangled photons over a free-space maritime channel with multiple spatial modes is presented. The entangled photons
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Djordjevic, Ivan B. "Integrated Optics Modules Based Proposal for Quantum Information Processing, Teleportation, QKD, and Quantum Error Correction Employing Photon Angular Momentum." IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2016. http://hdl.handle.net/10150/615122.

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To address key challenges for both quantum communication and quantum computing applications in a simultaneous manner, we propose to employ the photon angular momentum approach by invoking the well-known fact that photons carry both the spin angular momentum (SAM) and the orbital angular momentum (OAM). SAM is associated with polarization, while OAM is associated with azimuthal phase dependence of the complex electric field. Given that OAM eigenstates are mutually orthogonal, in principle, an arbitrary number of bits per single photon can be transmitted. The ability to generate/analyze states w
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11

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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12

Aymeric, Raphaël. "Convergence of quantum and classical communications." Electronic Thesis or Diss., Institut polytechnique de Paris, 2022. https://theses.hal.science/tel-03919212.

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Les protocoles de distribution de clé quantique (QKD) permettent de construire des canaux de communications sensibles à l’espionnage grâce aux propriétés quantiques fondamentales de la lumière. L’un des principaux défis à surpasser pour déployer de tels protocoles à grande échelle est le coût de déploiement de la technologie. Une solution attrayante en ce sens serait d’exploiter l’infrastructure de fibre optique déjà existante pour exécuter mettre en oeuvre de tels protocoles. Cela implique cependant de faire coexister des signaux quantiques avec des signaux telecoms classiques, ce qui peut êt
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13

Schiavon, Matteo. "Space Quantum Communication." Doctoral thesis, Università degli studi di Padova, 2017. http://hdl.handle.net/11577/3422779.

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The primary role played by communication in our society gives importance to the problem of securely transmitting sensitive information. Quantum physics can be exploited to solve this problem in a more secure way than it is possible by using classical protocols. The application of quantum physics to communication tasks is the basis of the new quantum communication field, of which quantum cryptography represents the most successful achievement. Quantum communication, however, suffers the presence of losses much more than classical communication. The high level of losses in fiber-based system
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14

Bogdanski, Jan. "Experimental multiuser secure quantum communications." Doctoral thesis, Stockholms universitet, Fysikum, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-26498.

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We are currently experiencing a rapid development of quantum information, a new branch of science, being an interdisciplinary of quantum physics, information theory, telecommunications, computer science, and many others. This new science branch was born in the middle of the eighties, developed rapidly during the nineties, and in the current decade has brought a technological breakthrough in creating secure quantum key distribution (QKD), quantum secret sharing, and exciting promises in diverse technological fields. Recent QKD experiments have achieved high rate QKD at 200 km distance in optica
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15

Gerlin, Francesca. "Beam Propagation in Quantum Communication." Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3424610.

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The aim of my thesis is to demonstrate the feasibility of Quantum Communication in free space and space, pointing out how ESA Galileo constellation could be strengthens into an Optical Quantum Communication Network (OQCN), by the employment of a compact and low cost prototype (SaNe-QKD OPT). Considering table 2 according the guidelines of [70] (2012) for the European Quantum Information Processing and Quantum Communication, three crucial long term goals are fulfilled, (Satellite Quantum Communication, besides 1000 kilometers of spatial Quantum Cryptography, multi-node Quantum Network), with re
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16

Tvedt, Ole Christian. "Quantum key distribution prototype." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-15845.

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This thesis covers the basics of cryptography, both classical and the newer quantum-basedapproches. Further, it details an implementation of a BB84-based quantum key distributionsystem currently under construction, focusing on the controlling hardware and FPGA-basedsoftware. The overarching goal is to create a system impervious to currently known attackson such systems. The system is currently running at 100 Mbit/s, though the goal is to double this asthe design nears its completion. The system currently chooses encoding base, bit value andwhether a state is a socalled decoy state. However,
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Schröder, Tim. "Integrated photonic systems for single photon generation and quantum applications." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2013. http://dx.doi.org/10.18452/16723.

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Im Rahmen der vorliegenden Dissertation wurden neuartige integrierte Einzelphotonenquellen (EPQ) und ihre Anwendung für die Quanteninformationsverarbeitung entwickelt und untersucht. Die Erzeugung von Einzelphotonen basiert auf einzelnen Defektzentren in nanometergroßen Diamantkristallen mit einzigartigen optischen Eigenschaften: Stabilität bei Zimmertemperatur ohne optisches Blinken. Diamantkristalle mit Größen bis unter 20nm wurden mit neuartigen „pick-and-place“ Techniken (z.B. mit einem Atomkraftmikroskop) in komplexe photonische Strukturen integriert. Zwei unterschiedliche Ansätze für di
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18

Weier, Henning. "European Quantum Key Distribution Network." Diss., lmu, 2011. http://nbn-resolving.de/urn:nbn:de:bvb:19-133206.

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19

Franz, Torsten [Verfasser]. "Quantum correlations and quantum key distribution / Torsten Franz." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2013. http://d-nb.info/1041654707/34.

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20

Simonsen, Eivind Sjøtun. "Security of quantum key distribution source." Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-10836.

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<p>Cryptography has begun its journey into the field of quantum information theory. Classical cryptography has shown weaknesses, which may be exploited in the future, either by development in mathematics, or by quantum computers. Quantum key distribution (QKD) is a promising path for cryptography to enable secure communication in the future. Although the theory of QKD promises absolute security, the reality is that current quantum crypto systems have flaws in them, as perfect devices have proven impossible to build. However, this can be taken into account in security proofs to ensure security,
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21

Nauerth, Sebastian. "Air to ground quantum key distribution." Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-162223.

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22

Gordon, Karen Jane. "GigaHertz clocked quantum key distribution system." Thesis, Heriot-Watt University, 2003. http://hdl.handle.net/10399/309.

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23

Tang, Xinke. "Optically switched quantum key distribution network." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/289444.

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Encrypted data transmission is becoming increasingly more important as information security is vital to modern communication networks. Quantum Key Distribution (QKD) is a promising method based on the quantum properties of light to generate and distribute unconditionally secure keys for use in classical data encryption. Significant progress has been achieved in the performance of QKD point-to-point transmission over a fibre link between two users. The transmission distance has exceeded several hundred kilometres of optical fibre in recent years, and the secure bit rate achievable has reached m
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Gorman, Philip Michael. "Practical free-space quantum key distribution." Thesis, Heriot-Watt University, 2010. http://hdl.handle.net/10399/2390.

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Within the last two decades, the world has seen an exponential increase in the quantity of data traffic exchanged electronically. Currently, the widespread use of classical encryption technology provides tolerable levels of security for data in day to day life. However, with one somewhat impractical exception these technologies are based on mathematical complexity and have never been proven to be secure. Significant advances in mathematics or new computer architectures could render these technologies obsolete in a very short timescale. By contrast, Quantum Key Distribution (or Quantum Cryptogr
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Schmitt-Manderbach, Tobias. "Long distance free-space quantum key distribution." Diss., lmu, 2007. http://nbn-resolving.de/urn:nbn:de:bvb:19-81020.

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26

Van, Assche Gilles. "Information-Theoretic aspects of quantum key distribution." Doctoral thesis, Universite Libre de Bruxelles, 2005. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211050.

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<p>La distribution quantique de clés est une technique cryptographique permettant l'échange de clés secrètes dont la confidentialité est garantie par les lois de la mécanique quantique. Le comportement particulier des particules élémentaires est exploité. En effet, en mécanique quantique, toute mesure sur l'état d'une particule modifie irrémédiablement cet état. En jouant sur cette propriété, deux parties, souvent appelées Alice et Bob, peuvent encoder une clé secrète dans des porteurs quantiques tels que des photons uniques. Toute tentative d'espionnage demande à l'espion, Eve, une mesure de
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El, Mabrok Osama H. Mohamed. "Wireless quantum key distribution in indoor environments." Thesis, University of Leeds, 2018. http://etheses.whiterose.ac.uk/22356/.

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Among all emerging quantum information technologies, quantum key distribution (QKD) is one of the most developed techniques. QKD harnesses the intrinsic laws of quantum mechanics to provide a method for distributing secret random keys, which can be used for data encryption and decryption between two intended users. QKD has already been demonstrated in different scenarios over optical fibre and in atmospheric channels. QKD has also been used for security assurance in several network settings, in addition of being commercially available today. Despite remarkable progress in QKD systems, convenie
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28

Zhong, Tian Ph D. Massachusetts Institute of Technology. "High-dimensional entanglement-based quantum key distribution." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/84903.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2013.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 135-148).<br>Conventional quantum key distribution (QKD) uses a discrete two-dimensional Hilbert space for key encoding, such as the polarization state of a single photon. In contrast, high-dimensional QKD allows encoding onto a larger state space, such as multiple levels of a continuous variable of a single photon, thus enabling the system to achieve higher photon information efficiency (
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29

Noori, Yasir Jamal. "Integrated optical components for quantum key distribution." Thesis, Lancaster University, 2017. http://eprints.lancs.ac.uk/87459/.

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The security of current public key cryptosystems, such as RSA, depends on the difficulty of computing certain functions known as trapdoor functions. However, as computational resources become more abundant with the fast development of super- and quantum computers, relying on such methods for communication security becomes risky. Quantum key distribution (QKD), is a potential solution that can allow theoretically secure key exchange for future communications. Chip-scale integration of this solution for securing communication of embedded systems and hand held devices demands miniaturizing the op
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Gutha, Akash. "QUANTUM KEY DISTRIBUTION USING FPGAS AND LEDS." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587769155531749.

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31

Denys, Aurélie. "Quantum key distribution and quantum error correction with bosonic systems." Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS152.

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Cette thèse porte sur l'étude théorique de la distribution quantique de clef et de la correction d'erreurs quantiques, mises en œuvre avec des systèmes bosoniques. Dans le premier chapitre, une borne analytique sur le taux secret asymptotique de clé des protocoles de distribution de clef quantique à variables continues est dérivée. Ce nombre permet de quantifier la sécurité d'un protocole et donc de comparer la sécurité de différentes instances d'un protocole pour faire un choix éclairé. Le chapitre 2 de la thèse présente et étudie un nouveau code bosonique, le qutrit 2T. Ce codage a la partic
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Nock, Richard William Raymond. "Flexible precision timing instrumentation and quantum key distribution." Thesis, University of Bristol, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.658313.

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Time to Digital Conversion (TDC) is a fundamental building block of many applications, such as quantum information experiments, quantum key distribution, laser detection and ranging (LiDAR), bio-medical imaging, digital phase lock loops, and more. As of today, most timing instruments make use of analogue circuitry or application specific integrated circuits to time input events to picosecond resolution and bin size. As such solutions require programmable logic , to perform calibration and communication tasks, there would be a considerable cost and simplification gain obtained in implementing p
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XAVIER, GUILHERME BARRETO. "MODULATION SCHEMES FOR FREQUENCY CODED QUANTUM KEY DISTRIBUTION." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2005. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=6483@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>A criptografia quântica foi proposta como uma solução para o problema da distribuição de chaves criptográficas com segurança total garantida pelos princípios da mecânica quântica. Através dessa técnica é possível saber se um espião tentou interceptar a transmissão, o que é impossível utilizando técnicas de transmissão clássicas. Nesse trabalho foi feito um breve resumo da teoria de criptografia quântica, de suas técnicas de transmissão e dos problemas tecnológicos enfrentados. Foi analisada em detalhes a técnica de transmis
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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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Lo, Piparo Nicolo. "Long-distance quantum key distribution with imperfect devices." Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/8582/.

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Quantum key distribution (QKD) is one of the most promising techniques for the secure exchange of cryptographic keys between two users. Its unique property of relying on the laws of physics makes it an appealing tool for secure communications. While QKD has been implemented over distances on the order of a few hundreds of kilometers, the transmission rate of the key severely drops, when we go to further distances. An easy solution to this could rely on a network of trusted nodes. This solution, however, is far from ideal. In this thesis, we focus on obtaining long-distance secure communication
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DELGADO, ALIZO MARIA TERESA. "Soft Processing Techniques for Quantum Key Distribution Applications." Doctoral thesis, Politecnico di Torino, 2012. http://hdl.handle.net/11583/2501669.

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This thesis deals with soft-information based information reconciliation and data sifting for Quantum Key Distribution (QKD). A novel composite channel model for QKD is identified, which includes both a hard output quantum channel and a soft output classic channel. The Log-Likelihood Ratios, - also called soft-metrics - derived from the two channels are jointly processed at the receiver, exploiting capacity achieving soft-metric based iteratively decoded block codes. The performance of the proposed mixed-soft-metric algorithms are studied via simulations as a function of the system parameters.
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Lynch, Alastair M. "Low Cost and Flexible Electronics for Quantum Key Distribution and Quantum Information." Thesis, University of Bristol, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.520592.

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38

Zhang, Lijian. "Towards Single Photon Quantum Key Distribution with Continuous Variables." Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526132.

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39

Ekemar, Liselott. "Polarization stabilization for quantum key distribution in deployed fibre." Thesis, KTH, Tillämpad fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279632.

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40

Panayi, Christiana. "Memory-assisted measurement-device-independent quantum key distribution systems." Thesis, University of Leeds, 2016. http://etheses.whiterose.ac.uk/12449/.

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Quantum key distribution (QKD) is one of the most prominent methods for secure exchange of cryptographic keys between two users. The laws of physics provide it with an immense tool towards secure communications. Although QKD has been proven to reach distances on the order of a few hundreds of kilometers, the transmission rate of the key significantly drops when we go to further distances. One possible solution to this is to build a network of trusted nodes. The trust requirement will however narrow its scope of deployability. In this thesis, we focus on improving the key rate performance of se
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Abruzzo, Silvestre [Verfasser], and Dagmar [Akademischer Betreuer] Bruß. "Long distance quantum key distribution with quantum repeaters / Silvestre Abruzzo. Betreuer: Dagmar Bruß." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2014. http://d-nb.info/1056035943/34.

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42

Marangon, Davide Giacomo. "Improving Quantum Key Distribution and Quantum Random Number Generation in presence of Noise." Doctoral thesis, Università degli studi di Padova, 2015. http://hdl.handle.net/11577/3424117.

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The argument of this thesis might be summed up as the exploitation of the noise to generate better noise. More specifically this work is about the possibility of exploiting classic noise to effectively transmit quantum information and measuring quantum noise to generate better quantum randomness. What do i mean by exploiting classical noise to transmit effectively quantum information? In this case I refer to the task of sending quantum bits through the atmosphere in order set up transmissions of quantum key distribution (QKD) and this will be the subject of Chapter 1 and Chapter 2. In th
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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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44

Weier, Henning [Verfasser], and Harald [Akademischer Betreuer] Weinfurter. "European Quantum Key Distribution Network / Henning Weier. Betreuer: Harald Weinfurter." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2011. http://d-nb.info/1015170226/34.

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45

Cederlöf, Jörgen. "Authentication in quantum key growing." Thesis, Linköping University, Department of Mathematics, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-3214.

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<p>Quantum key growing, often called quantum cryptography or quantum key distribution, is a method using some properties of quantum mechanics to create a secret shared cryptography key even if an eavesdropper has access to unlimited computational power. A vital but often neglected part of the method is unconditionally secure message authentication. This thesis examines the security aspects of authentication in quantum key growing. Important concepts are formalized as Python program source code, a comparison between quantum key growing and a classical system using trusted couriers is included,
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46

Grasselli, Federico [Verfasser], Dagmar [Akademischer Betreuer] Bruß, and Hermann [Akademischer Betreuer] Kampermann. "Quantum Cryptography: from Key Distribution to Conference Key Agreement / Federico Grasselli ; Dagmar Bruß, Hermann Kampermann." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2020. http://d-nb.info/1217840877/34.

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47

Collins, Robert John. "Point-to-point and passive optical network quantum key distribution systems." Thesis, Heriot-Watt University, 2008. http://hdl.handle.net/10399/2061.

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The emergence of a digital communications infrastructure over recent decades has fuelled the parallel development of advanced cryptographic techniques, to secure the ever increasing quantities of digital infonnation. From its foundation, quantum key distribution has generated significant theoretical and experimental research interest since it offers what ./ is currently the only method of verifiably secure cryptographic key distribution. By using the Heisenberg Uncertainty Principle, quantum key distribution offers a technique by which authorised parties can detect the potential presence of an
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48

Abidin, Aysajan. "Authentication in Quantum Key Distribution : Security Proof and Universal Hash Functions." Doctoral thesis, Linköpings universitet, Informationskodning, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-91265.

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Quantum Key Distribution (QKD) is a secret key agreement technique that consists of two parts: quantum transmission and measurement on a quantum channel, and classical post-processing on a public communication channel. It enjoys provable unconditional security provided that the public communication channel is immutable. Otherwise, QKD is vulnerable to a man-in-the-middle attack. Immutable public communication channels, however, do not exist in practice. So we need to use authentication that implements the properties of an immutable channel as well as possible. One scheme that serves this purpo
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Rogers, Daniel J. "New technologies for broadband quantum key distribution sources, detectors, and systems /." College Park, Md.: University of Maryland, 2008. http://hdl.handle.net/1903/8808.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2008.<br>Thesis research directed by: Chemical Physics Program. 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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Zhang, Yequn. "Advanced Coding Techniques For Fiber-Optic Communications And Quantum Key Distribution." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/555940.

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Coding is an essential technology for efficient fiber-optic communications and secure quantum communications. In particular, low-density parity-check (LDPC) coding is favoured due to its strong error correction capability and high-throughput implementation feasibility. In fiber-optic communications, it has been realized that advanced high-order modulation formats and soft-decision forward error correction (FEC) such as LDPC codes are the key technologies for the next-generation high-speed optical communications. Therefore, energy-efficient LDPC coding in combination with advanced modulation fo
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