Upper bounds for the security of two distributed-phase reference protocols of quantum cryptography

Branciard, Cyril, Gisin, Nicolas and Scarani, Valerio (2008) Upper bounds for the security of two distributed-phase reference protocols of quantum cryptography. New Journal of Physics, 10 Article number 013031. doi:10.1088/1367-2630/10/1/013031


Author Branciard, Cyril
Gisin, Nicolas
Scarani, Valerio
Title Upper bounds for the security of two distributed-phase reference protocols of quantum cryptography
Journal name New Journal of Physics   Check publisher's open access policy
ISSN 1367-2630
Publication date 2008-01-25
Sub-type Article (original research)
DOI 10.1088/1367-2630/10/1/013031
Open Access Status DOI
Volume 10
Start page Article number 013031
Total pages 26
Place of publication United Kingdom
Publisher Institute of Physics Publishing Ltd.
Language eng
Abstract The differential-phase-shift (DPS) and the coherent-one-way (COW) are among the most practical protocols for quantum cryptography, and are therefore the object of fast-paced experimental developments. The assessment of their security is also a challenge for theorists: the existing tools, that allow to prove security against the most general attacks, do not apply to these two protocols in any straightforward way. We present new upper bounds for their security in the limit of large distances (d ≳ 50 km with typical values in optical fibers) by considering a large class of collective attacks, namely those in which the adversary attaches ancillary quantum systems to each pulse or to each pair of pulses. We introduce also two modified versions of the COW protocol, which may prove more robust than the original one. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
Keyword Quantum theory
Robustness (control systems)
Security of data
Theorem proving
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
 
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Citation counts: TR Web of Science Citation Count  Cited 26 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 31 times in Scopus Article | Citations
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Created: Thu, 24 Mar 2011, 08:35:41 EST by Mr Cyril Branciard on behalf of Physics