论文标题
双场量子键分布，带有离散相关的来源
Twin-field quantum key distribution with discrete-phase-randomized sources
论文作者
论文摘要
得益于第三个不受信任的一方的单光子干扰，双场量子键分布（TF-QKD）协议及其变体可以击败而没有量子repeacer的众所周知的损失限制，并且最近实施了相关的实验。通常，应将这些方案中的量子状态随机切换在代码模式和测试模式之间。为了采用标准的诱饵态方法，假定在测试模式下相干状态源的阶段是连续随机的。但是，在实验实现中，这种关键的假设不能很好地满足。在本文中，为了弥合理论与实践之间的差距，我们提出了一个在代码模式和测试模式下具有离散相关源的TF-QKD变体，并证明了其针对集体攻击的安全性。我们的仿真结果表明，只有少数离散阶段，离散阶段的源的性能可以克服速率损失的结合，并接近连续相融合的来源的速率。
Thanks to the single-photon interference at a third untrusted party, the twin-field quantun key distribution (TF-QKD) protocol and its variants can beat the well-known rate-loss bound without quantum repeaters, and related experiments have been implemented recently. Generally, quantum states in these schemes should be randomly switched between the code mode and test mode. To adopt the standard decoy-state method, phases of coherent state sources in the test mode are assumed to be continuously randomized. However, such a crucial assumption cannot be well satisfied in experimental implementations. In this paper, to bridge the gap between theory and practice, we propose a TF-QKD variant with discrete-phase-randomized sources both in the code mode and test mode, and prove its security against collective attacks. Our simulation results indicate that, with only a small number of discrete phases, the performance of discrete-phase-randomized sources can overcome the rate-loss bound and approach that of continuous-phase-randomized sources.
