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High-Rate, High-Dimensional Quantum Key Distribution Systems

2018-10-01 Computers
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Release : 2018-10-01
Genre : Computers
Kind : eBook
Book Rating : 294/5 ( reviews)

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Book Synopsis High-Rate, High-Dimensional Quantum Key Distribution Systems by : Nurul T. Islam

Download or read book High-Rate, High-Dimensional Quantum Key Distribution Systems written by Nurul T. Islam. This book was released on 2018-10-01. Available in PDF, EPUB and Kindle. Book excerpt: This book describes a broad research program on quantum communication. Here, a cryptographic key is exchanged by two parties using quantum states of light and the security of the system arises from the fundamental properties of quantum mechanics. The author developed new communication protocols using high-dimensional quantum states so that more than one classical bit is transferred by each photon. This approach helps circumvent some of the non-ideal properties of the experimental system, enabling record key rates on metropolitan distance scales. Another important aspect of the work is the encoding of the key on high-dimensional phase-randomized weak coherent states, combined with so-called decoy states to thwart a class of possible attacks on the system. The experiments are backed up by a rigorous security analysis of the system, which accounts for all known device non-idealities. The author goes on to demonstrate a scalable approach for increasing the dimension of the quantum states, and considers attacks on the system that use optimal quantum cloning techniques. This thesis captures the current state-of-the-art of the field of quantum communication in laboratory systems, and demonstrates that phase-randomized weak coherent states have application beyond quantum communication.

High-dimensional Entanglement-based Quantum Key Distribution

2013
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Release : 2013
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Book Synopsis High-dimensional Entanglement-based Quantum Key Distribution by : Tian Zhong (Ph. D.)

Download or read book High-dimensional Entanglement-based Quantum Key Distribution written by Tian Zhong (Ph. D.). This book was released on 2013. Available in PDF, EPUB and Kindle. Book excerpt: 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 (bits/photon) and potentially higher key rate (bits/second). However, its deployment requires high-performance source, detector, and routing technologies tailored to the specific large-alphabet encoding scheme. One such high-dimensional QKD system of interest is based on time-energy entanglement, in which keys are derived from the arrival times of photon pairs generated from continuous-wave (CW) spontaneous parametric downconversion (SPDC). This thesis focuses on the implementation of a time-energy entanglement-based QKD system, with the development of several enabling technologies including an efficient single-spatial-mode source of time-energy entangled photons based on a periodically-poled KTiOPO4 (PPKTP) waveguide, GHz self-differencing InGaAs singlephoton avalanche diodes (SPADs), and the first demonstration of non-locally dispersion-canceled Franson quantum interferometry achieving 99.6% visibility. We then utilize these technologies to perform two full QKD protocols. The first protocol uses SPDCgenerated entangled photons for both key extraction and Franson interferometry, yielding a secure key rate -90 kbits/s with up to 4 bits/photon after error-correction and privacy amplification. The second protocol deploys two different photon sources: an amplified spontaneous emission (ASE) source is pulse-position modulated to perform random key generation, and a CW-SPDC source is for Franson security check. In this latter case, we have achieved a secure key rate 7.3 Mbits/s with 2.9 bits/photon, which represents the state-of-the-art in today's QKD technology.

Twisted Photons

2011-03-31 Science
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Release : 2011-03-31
Genre : Science
Kind : eBook
Book Rating : 378/5 ( reviews)

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Book Synopsis Twisted Photons by : Juan P. Torres

Download or read book Twisted Photons written by Juan P. Torres. This book was released on 2011-03-31. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with applications in several areas of science and technology that make use of light which carries orbital angular momentum. In most practical scenarios, the angular momentum can be decomposed into two independent contributions: the spin angular momentum and the orbital angular momentum. The orbital contribution affords a fundamentally new degree of freedom, with fascinating and wide-spread applications. Unlike spin angular momentum, which is associated with the polarization of light, the orbital angular momentum arises as a consequence of the spatial distribution of the intensity and phase of an optical field, even down to the single photon limit. Researchers have begun to appreciate its implications for our understanding of the ways in which light and matter can interact, and its practical potential in different areas of science and technology.

High-dimensional Quantum Communication Over Deployed Fiber

2018
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Release : 2018
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Book Synopsis High-dimensional Quantum Communication Over Deployed Fiber by : Catherine Lee (Ph. D.)

Download or read book High-dimensional Quantum Communication Over Deployed Fiber written by Catherine Lee (Ph. D.). This book was released on 2018. Available in PDF, EPUB and Kindle. Book excerpt: Quantum key distribution (QKD) exploits the inherent strangeness of quantum mechanics to improve secure communication, enabling two pre-authenticated participants to establish symmetric encryption keys over long distances, without making any assumptions about the computational abilities of an adversary. QKD commonly relies on the transmission and detection of single photons to distribute the secret keys, but the secret-key generation rates are often limited by hardware, namely the ability to produce or detect nonclassical states of light. We address this challenge by using high-dimensional encoding to increase the secure information yield per detected photon. In this thesis, we present security analysis for and the first demonstrations of a resource-efficient high-dimensional QKD protocol, including two varieties of implementation that each have different strengths and weaknesses. We introduce a 42-km deployed fiber testbed that we use to demonstrate our high-dimensional QKD protocol. We also demonstrate the violation of a steering inequality, confirming that we can produce entanglement in the lab and distribute it over the deployed fiber. By these experiments, we demonstrate both the utility of our high-dimensional QKD protocol and the feasibility of our testbed for further applications in quantum communication and networking.

Physical-Layer Security and Quantum Key Distribution

2019-09-14 Computers
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Release : 2019-09-14
Genre : Computers
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Book Rating : 655/5 ( reviews)

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Book Synopsis Physical-Layer Security and Quantum Key Distribution by : Ivan B. Djordjevic

Download or read book Physical-Layer Security and Quantum Key Distribution written by Ivan B. Djordjevic. This book was released on 2019-09-14. Available in PDF, EPUB and Kindle. Book excerpt: This textbook integrates the most advanced topics of physical-layer security, cryptography, covert/stealth communications, quantum key distribution (QKD), and cyber security to tackle complex security issues. After introducing the reader to various concepts and practices, the author addresses how these can work together to target problems, rather than treating them as separate disciplines. This book offers students an in-depth exposition on: cryptography, information-theoretic approach to cryptography, physical-layer security, covert/stealth/low-probability of detection communications, quantum information theory, QKD, and cyber security; to mention few. The goal is to provide a unified description of the most advanced topics related to: (i) modern cryptography, (ii) physical-layer security, (iii) QKD, (iv) covert communications, and (v) cyber security. Each chapter is followed by a set of problems. Also, for readers to better understand the book, an appendix covers all needed background. Homework problems and lecture notes are available online. The book does not require any prior knowledge or prerequisite material.

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