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

作者：Wen Kai^*; Tamaki Kiyoshi; Yamamoto Yoshihisa

来源：Physical Review Letters, 2009, 103(17): 170503.

DOI：10.1103/PhysRevLett.103.170503

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.

• 出版日期2009-10-23