Liu Hang, Yin Zhen-Qiang, Wang Rong, Lu Feng-Yu, Wang Shuang, Chen Wei, Huang Wei, Xu Bing-Jie, Guo Guang-Can, Han Zheng-Fu
Opt Express. 2020 May 11;28(10):15416-15423. doi: 10.1364/OE.391924.
Since the round-robin-differential-phase-shift (RRDPS) quantum key distribution (QKD) protocol was proposed, it has attracted much attention due to its unique characteristic i.e., it can bind the amount of information leakage without monitoring signal disturbance. Recently, Yin et al. have developed a novel theory to estimate its information leakage tightly. However, the finite-sized key effects are not taken into account. Here, we fill this gap and extend the security proof of the RRDPS protocol to the finite-sized regime using post-selection technique. As a consequence, it's predicted that the key rate of RRDPS in a finite-sized key scenario can be comparable to the asymptotic one, which is meaningful for the real-life applications.
自从提出循环差分相移（RRDPS）量子密钥分发（QKD）协议以来，它因其独特的特性，即无需监测信号干扰就能限制信息泄露量，而备受关注。最近，尹等人提出了一种新理论来精确估计其信息泄露量。然而，该理论没有考虑有限尺寸密钥效应。在此，我们填补了这一空白，并使用后选择技术将RRDPS协议的安全性证明扩展到有限尺寸范围。结果表明，在有限尺寸密钥场景下，RRDPS的密钥生成率可以与渐近密钥生成率相当，这对于实际应用具有重要意义。
