Unconditional Security of Coherent-State Quantum Key Distribution with a Strong Phase-Reference Pulse
- 15 September 2004
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 93 (12), 120501
- https://doi.org/10.1103/physrevlett.93.120501
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 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.Keywords
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