4,624 research outputs found
Information Geometric Security Analysis of Differential Phase Shift Quantum Key Distribution Protocol
This paper analyzes the information-theoretical security of the Differential
Phase Shift (DPS) Quantum Key Distribution (QKD) protocol, using efficient
computational information geometric algorithms. The DPS QKD protocol was
introduced for practical reasons, since the earlier QKD schemes were too
complicated to implement in practice. The DPS QKD protocol can be an integrated
part of current network security applications, hence it's practical
implementation is much easier with the current optical devices and optical
networks. The proposed algorithm could be a very valuable tool to answer the
still open questions related to the security bounds of the DPS QKD protocol.Comment: 42 pages, 34 figures, Journal-ref: Security and Communication
Networks (John Wiley & Sons, 2012), presented in part at the IEEE Int.
Conference on Network and Service Security (IEEE N2S 2009
Detector dead-time effects and paralyzability in high-speed quantum key distribution
Recent advances in quantum key distribution (QKD) have given rise to systems
that operate at transmission periods significantly shorter than the dead times
of their component single-photon detectors. As systems continue to increase in
transmission rate, security concerns associated with detector dead times can
limit the production rate of sifted bits. We present a model of high-speed QKD
in this limit that identifies an optimum transmission rate for a system with
given link loss and detector response characteristics
The Security of Practical Quantum Key Distribution
Quantum key distribution (QKD) is the first quantum information task to reach
the level of mature technology, already fit for commercialization. It aims at
the creation of a secret key between authorized partners connected by a quantum
channel and a classical authenticated channel. The security of the key can in
principle be guaranteed without putting any restriction on the eavesdropper's
power.
The first two sections provide a concise up-to-date review of QKD, biased
toward the practical side. The rest of the paper presents the essential
theoretical tools that have been developed to assess the security of the main
experimental platforms (discrete variables, continuous variables and
distributed-phase-reference protocols).Comment: Identical to the published version, up to cosmetic editorial change
The Impact of Quantum Computing on Present Cryptography
The aim of this paper is to elucidate the implications of quantum computing
in present cryptography and to introduce the reader to basic post-quantum
algorithms. In particular the reader can delve into the following subjects:
present cryptographic schemes (symmetric and asymmetric), differences between
quantum and classical computing, challenges in quantum computing, quantum
algorithms (Shor's and Grover's), public key encryption schemes affected,
symmetric schemes affected, the impact on hash functions, and post quantum
cryptography. Specifically, the section of Post-Quantum Cryptography deals with
different quantum key distribution methods and mathematicalbased solutions,
such as the BB84 protocol, lattice-based cryptography, multivariate-based
cryptography, hash-based signatures and code-based cryptography.Comment: 10 pages, 1 figure, 3 tables, journal article - IJACS
Quantum Computing and Communications
This book explains the concepts and basic mathematics of quantum computing and communication. Chapters cover such topics as quantum algorithms, photonic implementations of discrete-time quantum walks, how to build a quantum computer, and quantum key distribution and teleportation, among others
Quantum Cryptography
Quantum cryptography could well be the first application of quantum mechanics
at the individual quanta level. The very fast progress in both theory and
experiments over the recent years are reviewed, with emphasis on open questions
and technological issues.Comment: 55 pages, 32 figures; to appear in Reviews of Modern Physic
Quantum information processing with space-division multiplexing optical fibres
The optical fibre is an essential tool for our communication infrastructure
since it is the main transmission channel for optical communications. The
latest major advance in optical fibre technology is spatial division
multiplexing (SDM), where new fibre designs and components establish multiple
co-existing data channels based on light propagation over distinct transverse
optical modes. Simultaneously, there have been many recent developments in the
field of quantum information processing (QIP), with novel protocols and devices
in areas such as computing, communication and metrology. Here, we review recent
works implementing QIP protocols with SDM optical fibres, and discuss new
possibilities for manipulating quantum systems based on this technology.Comment: Originally submitted version. Please see published version for
improved layout, new tables and updated references following review proces
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