Refined security proof of the round-robin differential-phase-shift quantum key distribution and its improved performance in the finite-sized case
Refined security proof of the round-robin differential-phase-shift quantum key distribution and its improved performance in the finite-sized case
复制标题
DOI：
10.1103/physreva.99.042303
复制
发表时间：
2018-12
影响因子：
2.9
通讯作者：
Takaya Matsuura;Toshihiko Sasaki;M. Koashi
中科院分区：
文献类型：
--
作者：
Takaya Matsuura;Toshihiko Sasaki;M. Koashi
在众多量子密钥分发（QKD）协议中，轮询差分相移（RRDPS）协议的独特之处在于它可以在不监测信号干扰的情况下对信息泄漏量进行上界限制。然而，为了加快协议的实现，形成单个块的脉冲数量应该保持较小，这大大降低了原始安全证明中的密钥速率。本文在不改变原始实验设置的情况下，改进了有限规模RRDPS协议的安全性证明，实现了对信息泄漏的更严格估计。因此，我们在渐近和有限大小的情况下都获得了更好的密钥率，同时保留了协议的优选特征，例如省略了相位随机化。
Among many quantum key distribution (QKD) protocols, the round-robin differential phase shift (RRDPS) protocol is unique in that it can upper-bound the amount of the information leakage without monitoring the signal disturbance. To expedite implementation of the protocol, however, the number of pulses forming a single block should be kept small, which significantly decreases the key rates in the original security proof. In the present paper, we refine the security proof of the RRDPS protocol in the finite-sized regime and achieve a tighter estimation for the information leakage without changing the original experimental setups. As a consequence, we obtain better key rates in both asymptotic and finite-sized cases while keeping the preferable features of the protocol, such as omission of phase randomization.