Experimental quantum key distribution with decoy states
Experimental quantum key distribution with decoy states
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DOI：
10.1103/physrevlett.96.070502
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发表时间：
2006-02-24
影响因子：
8.6
通讯作者：
Qian, L
中科院分区：
文献类型：
--
作者：
Zhao, Y;Qi, B;Qian, L
为了大幅度提高量子密钥分发（QKD）的传输距离和密钥生成速率，人们提出了利用不同强度的信号作为量子诱饵的思想。在这里，我们提出了诱饵态QKD的第一个实验实现。通过对一个商用量子密钥分发系统进行简单的修改，我们证明了在15 km的通信光纤上可以获得165 bit/s的安全密钥生成速率，这是理论极限的1/4。我们还表明，在相同的实验参数，甚至没有一个安全的密钥位可以提取与非诱饵状态协议。与单光子源相比，诱饵态量子密钥分发是一种简单的方法，可以提高无条件安全量子密钥分发的距离和密钥生成速率。
To increase dramatically the distance and the secure key generation rate of quantum key distribution (QKD), the idea of quantum decoys-signals of different intensities-has recently been proposed. Here, we present the first experimental implementation of decoy state QKD. By making simple modifications to a commercial quantum key distribution system, we show that a secure key generation rate of 165 bit/s, which is 1/4 of the theoretical limit, can be obtained over 15 km of a telecommunication fiber. We also show that with the same experimental parameters, not even a single bit of secure key can be extracted with a non-decoy-state protocol. Compared to building single photon sources, decoy state QKD is a much simpler method for increasing the distance and key generation rate of unconditionally secure QKD.