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Title: Upper bounds for the security of two distributed-phase reference protocols of quantum cryptography
Authors: Branciard, C.
Gisin, N.
Scarani, V. 
Issue Date: 25-Jan-2008
Citation: Branciard, C., Gisin, N., Scarani, V. (2008-01-25). Upper bounds for the security of two distributed-phase reference protocols of quantum cryptography. New Journal of Physics 10 : -. ScholarBank@NUS Repository.
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.
Source Title: New Journal of Physics
ISSN: 13672630
DOI: 10.1088/1367-2630/10/1/013031
Appears in Collections:Staff Publications

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