Experimental Passive Round-Robin Differential Phase-Shift Quantum Key Distribution
Experimental Passive Round-Robin Differential Phase-Shift Quantum Key Distribution
复制标题
实验被动循环差分相移量子密钥分配
DOI：
10.1103/physrevlett.114.180502
复制
发表时间：
2015-05-06
影响因子：
8.6
通讯作者：
Pan, Jian-Wei
中科院分区：
文献类型：
--
作者：
Guan, Jian-Yu;Cao, Zhu;Pan, Jian-Wei
在量子密钥分发（QKD）中，比特误码率被用来估计信息泄漏，从而确定隐私放大的量-通过缩短密钥使最终密钥成为私有的。通常，每个方案都存在一个错误率阈值，超过该阈值就不能生成安全密钥。该阈值对环境噪声施加限制。例如，广泛使用的QKD协议，Bennett-Bennett协议，不能容忍超过25%的错误率。一个新的协议，循环差分相移（RRDPS）量子密钥分配，基本上消除了这一限制，并在原则上可以容忍更多的环境干扰。在这里，我们提出并实验证明了被动RRDPS QKD方案。特别是，我们的500 MHz被动RRDPS QKD系统能够生成超过50公里的安全密钥，误码率高达29%。该方案应在噪声环境条件下找到其应用。
In quantum key distribution (QKD), the bit error rate is used to estimate the information leakage and hence determines the amount of privacy amplification-making the final key private by shortening the key. In general, there exists a threshold of the error rate for each scheme, above which no secure key can be generated. This threshold puts a restriction on the environment noises. For example, a widely used QKD protocol, the Bennett-Brassard protocol, cannot tolerate error rates beyond 25%. A new protocol, round-robin differential phase-shifted (RRDPS) QKD, essentially removes this restriction and can in principle tolerate more environment disturbance. Here, we propose and experimentally demonstrate a passive RRDPS QKD scheme. In particular, our 500 MHz passive RRDPS QKD system is able to generate a secure key over 50 km with a bit error rate as high as 29%. This scheme should find its applications in noisy environment conditions.