Upper bounds on the performance of differential-phase-shift quantum key distribution

Details Upper bounds on the performance of differential-phase-shift quantum key distribution Upper bounds on the performance of differential-phase-shift quantum key distribution

2008-06-04

arxiv.org/abs/0806.0858v1

QIC Vol 9,p. 62-80 (2009)

Physics

Quantum Physics

11 pages, 6 figures

Scientific paper

In this paper, we investigate limitations imposed by sequential attacks on the performance of a differential-phase-shift (DPS) quantum key distribution (QKD) protocol with weak coherent pulses. Specifically, we analyze a sequential attack based on optimal unambiguous discrimination of the relative phases between consecutive signal states emitted by the source. We show that this attack can provide tighter upper bounds for the security of a DPS QKD scheme than those derived from sequential attacks where the eavesdropper aims to identify the state of each signal emitted by the source unambiguously.

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