Physics – Quantum Physics
Scientific paper
2008-06-16
Phys. Rev. Lett. 103, 170503 (2009)
Physics
Quantum Physics
5 pages, 2 figures; shorten the length, improve clarity, and correct typos; accepted for publication in Physical Review Letter
Scientific paper
10.1103/PhysRevLett.103.170503
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.
Tamaki Kiyoshi
Wen Kai
Yamamoto Yoshihisa
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