Practical decoy state for quantum key distribution
Practical decoy state for quantum key distribution
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DOI：
10.1103/physreva.72.012326
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发表时间：
2005-07-01
影响因子：
2.9
通讯作者：
Lo, HK
中科院分区：
文献类型：
--
作者：
Ma, XF;Qi, B;Lo, HK
最近，诱饵态被提出作为一种有效的方法来大幅提高量子密钥分发（QKD）的性能。在这里，我们提出了一种仅基于两种诱饵状态和一种信号状态的诱饵状态协议的一般理论。我们对两个诱饵状态和信号状态的强度选择进行优化。我们的结果表明，仅具有两种类型的诱饵状态（真空和弱诱饵状态）的诱饵状态协议渐近地接近最一般类型的诱饵状态协议（具有无限数量的诱饵状态）的理论极限。我们还提出了一种单诱饵状态协议。此外，我们还对统计波动的影响进行了估计，并表明，即使对于长距离（大于 100 公里）QKD，我们的两诱饵状态协议也只需几个小时的实验数据即可实现。综上所述，诱饵态量子密钥分发具有很强的实用性。
Decoy states have recently been proposed as a useful method for substantially improving the performance of quantum key distribution (QKD). Here, we present a general theory of the decoy state protocol based on only two decoy states and one signal state. We perform optimization on the choice of intensities of the two decoy states and the signal state. Our result shows that a decoy state protocol with only two types of decoy states-the vacuum and a weak decoy state-asymptotically approaches the theoretical limit of the most general type of decoy state protocol (with an infinite number of decoy states). We also present a one-decoy-state protocol. Moreover, we provide estimations on the effects of statistical fluctuations and suggest that, even for long-distance (larger than 100 km) QKD, our two-decoy-state protocol can be implemented with only a few hours of experimental data. In conclusion, decoy state quantum key distribution is highly practical.