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

Authors:
Hipólito Gómez-Sousa;Marcos Curty
Affiliations:
ETSI Telecomunicación, Department of Signal Theory and Communications, University of Vigo, Vigo, Spain;ETSI Telecomunicación, Department of Signal Theory and Communications, University of Vigo, Vigo, Spain
Venue:
Quantum Information & Computation
Year:
2009

Citing 3
Cited 1

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

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A semidefinite programming approach to optimal unambiguous discrimination of quantum states

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Differential phase shift quantum private comparison

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Abstract

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.