Unconditional Security of Single-Photon Differential Phase Shift Quantum Key Distribution

Kai Wen; Kiyoshi Tamaki; Yoshihisa Yamamoto

doi:10.1103/PhysRevLett.103.170503

Unconditional Security of Single-Photon Differential Phase Shift Quantum Key Distribution

Quantum Physics 2009-10-23 v3

Authors: Kai Wen , Kiyoshi Tamaki , Yoshihisa Yamamoto

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Abstract

In this Letter, we prove the unconditional security of 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 DPS-QKD can generate 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 coherent state DPS-QKD.

Keywords

quantum key distribution

Cite

@article{arxiv.0806.2684,
  title  = {Unconditional Security of Single-Photon Differential Phase Shift Quantum Key Distribution},
  author = {Kai Wen and Kiyoshi Tamaki and Yoshihisa Yamamoto},
  journal= {arXiv preprint arXiv:0806.2684},
  year   = {2009}
}

Comments

5 pages, 2 figures; shorten the length, improve clarity, and correct typos; accepted for publication in Physical Review Letters

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