论文标题
双场量子键分布，具有被动式态度
Twin-field quantum key distribution with passive-decoy state
论文作者
论文摘要
双场量子键分布（TF-QKD）及其变体，例如相匹配的QKD，发送或不介绍QKD和没有相选的阶段TFQKD承诺长时间高键率，以超过速率距离，而无需中继器。这些协议的安全证明基于诱饵态方法，通常通过在实际实验中通过主动调节可变的光衰减器以及随机数生成器来执行，但是，这样的主动驱动方案可能会导致侧通道并可以打开安全性漏洞。为了提高TF-QKD的源安全性，在本文中，我们提出了基于被动decoy的TF-QKD，其中我们将TF-QKD与被动decoy方法相结合。我们提出了一个模拟，将关键生成率与现役率相比，结果表明我们的方案的性能与主动诱饵TF-QKD一样好，我们的方案只需几个光子探测器即可达到令人满意的秘密密钥速率。这表明我们的工作在实践中是有意义的。
Twin-Field quantum key distribution (TF-QKD) and its variants, e.g. Phase-Matching QKD, Sending-or-not-sending QKD, and No Phase Post-Selection TFQKD promise high key rates at long distance to beat the rate distance limit without a repeater. The security proof of these protocols are based on decoy-state method, which is usually performed by actively modulating a variable optical attenuator together with a random number generator in practical experiments, however, active-decoy schemes like this may lead to side channel and could open a security loophole. To enhance the source security of TF-QKD, in this paper, we propose passive-decoy based TF-QKD, in which we combine TF-QKD with the passive-decoy method. And we present a simulation comparing the key generation rate with that in active-decoy, the result shows our scheme performs as good as active decoy TF-QKD, and our scheme could reach satisfactory secret key rates with just a few photon detectors. This shows our work is meaningful in practice.
