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Unconditional security of single-photon differential phase shift quantum key distribution.

Authors
  • 1
  • 1 Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA.
Type
Published Article
Journal
Physical Review Letters
1079-7114
Publisher
American Physical Society
Publication Date
Volume
103
Issue
17
Pages
170503–170503
Identifiers
PMID: 19905739
Source
Medline
License
Unknown

Abstract

In this Letter, we prove the unconditional security of the single-photon differential phase shift quantum key distribution (DPS-QKD) protocol, based on the conversion to an equivalent entanglement-based protocol. We estimate the upper bound of the phase error rate from the bit error rate, and show that the DPS-QKD protocol can generate an unconditionally secure key when the bit error rate is not greater than 4.12%. This proof is the first step to the unconditional security proof of a coherent state DPS-QKD.

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