Unconditional security of coherent-state-based differential phase shift quantum key distribution protocol with block-wise phase randomization

2012/08/09 by Tamaki, Kiyoshi, Koashi, Masato, Kato, Go
#FOS: Physical sciences #Quantum Physics (quant-ph)

paper · doi:10.48550/arxiv.1208.1995

Abstract

We prove the unconditional security of coherent-state-based differential phase shift quantum key distribution protocol (DPSQKD) with block-wise phase randomization. Our proof is based on the conversion of DPSQKD to an equivalent entanglement-distillation protocol where the estimated phase error rate determines the amount of the privacy amplification. The generated final key has a contribution from events where the sender emits two or more photons, indicating the robustness of DPSQKD against photon-number-splitting attacks.

Related

• Phase randomization improves the security of quantum key distribution
• Security of differential phase shift QKD against explicit individual attacks
• Security and entanglement in differential-phase-shift quantum key distribution
• Non-deterministic Two-Way Quantum Key Distribution using Coherent States
• Security proof for Round Robin Differential Phase Shift QKD