Phys. Rev. Lett. 93, 120501 (2004) [4 pages]Unconditional Security of Coherent-State Quantum Key Distribution with a Strong Phase-Reference PulseReceived 25 March 2004; published 15 September 2004 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 with 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. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.120501
DOI:
10.1103/PhysRevLett.93.120501
PACS:
03.67.Dd, 03.67.Hk, 42.50.Ar
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