Sequential attacks against differential-phase-shift quantum key distribution with weak coherent states

Details Sequential attacks against differential-phase-shift quantum key distribution with weak coherent states Sequential attacks against differential-phase-shift quantum key distribution with weak coherent states

2006-09-12

arxiv.org/abs/quant-ph/0609094v1

QIC Vol 7,p. 665-688 (2007)

Physics

Quantum Physics

13 pages, 11 figures

Scientific paper

We investigate limitations imposed by sequential attacks on the performance of differential-phase-shift quantum key distribution protocols that use pulsed coherent light. In particular, we analyze two sequential attacks based on unambiguous state discrimination and minimum error discrimination, respectively, of the signal states emitted by the source. Sequential attacks represent a special type of intercept-resend attacks and, therefore, they do not allow the distribution of a secret key.

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