Security of round-robin differential-phase-shift quantum-key-distribution protocol with correlated light sources
Security of round-robin differential-phase-shift quantum-key-distribution protocol with correlated light sources
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DOI：
10.1103/physreva.104.062611
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发表时间：
2021-07
影响因子：
2.9
通讯作者：
Akihiro Mizutani;G. Kato
中科院分区：
文献类型：
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作者：
Akihiro Mizutani;G. Kato
在众多的量子密钥分发协议中，循环差分相移（RRDPS）协议具有一个独特的特点，即它的安全性是在不监视任何统计信息的情况下得到保证的。此外，该协议具有一个显着的属性是强大的源缺陷假设发射的脉冲是独立的。不幸的是，一些实验证实了由于脉冲相关性而违反了独立性，因此缺乏不考虑这种影响的安全性证明是安全性的障碍。在本文中，我们证明了RRDPS协议是安全的，对任何来源的缺陷，建立一个证明与脉冲相关性。我们的证明是简单的，因为我们只对源做了三个实验上简单的假设。在此基础上进行的数值模拟表明，长距离脉冲相关性对密钥速率没有显著影响，这揭示了RRDPS协议的另一个显著特点。因此，我们的安全证明是有效的，适用于广泛的实际来源，并铺平了道路，实现真正安全的QKD在高速系统。
Among various quantum key distribution (QKD) protocols, the round-robin differential-phase-shift (RRDPS) protocol has a unique feature that its security is guaranteed without monitoring any statistics. Moreover, this protocol has a remarkable property of being robust against source imperfections assuming that the emitted pulses are independent. Unfortunately, some experiments confirmed the violation of the independence due to pulse correlations, and therefore the lack of a security proof without taking into account this effect is an obstacle for the security. In this paper, we prove that the RRDPS protocol is secure against any source imperfections by establishing a proof with the pulse correlations. Our proof is simple in the sense that we make only three experimentally simple assumptions for the source. Our numerical simulation based on the proof shows that the long-range pulse correlation does not cause a significant impact on the key rate, which reveals another striking feature of the RRDPS protocol. Our security proof is thus effective and applicable to wide range of practical sources and paves the way to realize truly secure QKD in high-speed systems.