Tight security bounds for decoy-state quantum key distribution

• URL: http://arxiv.org/abs/2002.06530v1
• Date: Sun, 16 Feb 2020 07:48:25 GMT
• Title: Tight security bounds for decoy-state quantum key distribution
• Authors: Hua-Lei Yin, Min-Gang Zhou, Jie Gu, Yuan-Mei Xie, Yu-Shuo Lu, Zeng-Bing Chen
• Abstract summary: The BB84 quantum key distribution (QKD) combined with decoy-state method is currently the most practical protocol. Here, we provide the rigorous and optimal analytic formula to solve the above tasks. Our results can be widely applied to deal with statistical fluctuation in quantum cryptography protocols.
• Score: 1.1563829079760959
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The BB84 quantum key distribution (QKD) combined with decoy-state method is currently the most practical protocol, which has been proved secure against general attacks in the finite-key regime. Thereinto, statistical fluctuation analysis methods are very important in dealing with finite-key effects, which directly affect secret key rate, secure transmission distance and even the most important security. There are two tasks of statistical fluctuation in decoy-state BB84 QKD. One is the deviation between expected value and observed value for a given expected value or observed value. The other is the deviation between phase error rate of computational basis and bit error rate of dual basis. Here, we provide the rigorous and optimal analytic formula to solve the above tasks, resulting higher secret key rate and longer secure transmission distance. Our results can be widely applied to deal with statistical fluctuation in quantum cryptography protocols.

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