论文标题
双场量子键分布，具有完全离散的相随机化
Twin-field quantum key distribution with fully discrete phase randomization
论文作者
论文摘要
双场（TF）量子密钥分布（QKD）可以在点对点QKD链路上克服基本的秘密键率界限，从而使我们达到的距离比以往任何时候都更长。自引入以来，已经提出了几种TF-QKD变体，其中一些已通过实验实施。他们中的大多数人认为用户可以以连续的随机阶段发出弱相干脉冲。实际上，这个假设通常不满足，这可能会在其实施中打开安全漏洞。为了关闭此漏洞，我们提出并证明了仅依赖离散相随机化的TF-QKD变体的安全性。值得注意的是，我们的结果表明，它还可以提供比依赖连续相随机化的对应方案更高的秘密率。
Twin-field (TF) quantum key distribution (QKD) can overcome fundamental secret-key-rate bounds on point-to-point QKD links, allowing us to reach longer distances than ever before. Since its introduction, several TF-QKD variants have been proposed, and some of them have already been implemented experimentally. Most of them assume that the users can emit weak coherent pulses with a continuous random phase. In practice, this assumption is often not satisfied, which could open up security loopholes in their implementations. To close this loophole, we propose and prove the security of a TF-QKD variant that relies exclusively on discrete phase randomisation. Remarkably, our results show that it can also provide higher secret-key rates than counterpart protocols that rely on continuous phase randomisation.
