Unconditional security of coherent-state quantum key distribution with strong phase-reference pulse

Abstract

We prove the unconditional security of a quantum key distribution protocol in which bit values are encoded in the phase of a weak coherent-state pulse relative to a strong reference pulse. In contrast to implementations in which a weak pulse is used as a substitute for a single-photon source, the achievable key rate is found to decrease only linearly with the transmission of the channel.

4 pages, 3 figures

References in corpus (1)

• Unconditional Security of the Bennett 1992 quantum key-distribution over lossy and noisy channel

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