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

Authors
  • Wen, Kai1
  • Tamaki, Kiyoshi
  • Yamamoto, Yoshihisa
  • 1 Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA.
Type
Published Article
Journal
Physical Review Letters
Publisher
American Physical Society
Publication Date
Oct 23, 2009
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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