Experimental passive decoy-state quantum key distribution
Experimental passive decoy-state quantum key distribution
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DOI：
10.1088/1612-2011/11/8/085202
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发表时间：
2014-05
影响因子：
1.7
通讯作者：
Qi-Chao Sun;Weilong Wang;Yang Liu;Fei Zhou;J. Pelc;M. Fejer;Cheng-Zhi Peng;Xianfeng Chen;Xiongfeng Ma;Qiang Zhang;Jian-Wei Pan
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文献类型：
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作者：
Qi-Chao Sun;Weilong Wang;Yang Liu;Fei Zhou;J. Pelc;M. Fejer;Cheng-Zhi Peng;Xianfeng Chen;Xiongfeng Ma;Qiang Zhang;Jian-Wei Pan
在实际的量子密钥分配系统中，诱饵态方法被广泛地用于用实际的不同强度的光源代替理想的单光子源。被动诱饵态方法在参量下转换光子源中采用内建诱饵态代替主动调制，减少了诱饵态制备过程中的边信道信息泄漏，提高了安全性。通过使用低暗计数上转换单光子探测器，我们在50 km长的光纤上实验演示了被动诱饵态方法，并获得了约100 bit s-1的密钥速率。我们的结果表明，被动诱饵态源是未来量子通信实现的一个实际候选者。
The decoy-state method is widely used in practical quantum key distribution systems to replace ideal single photon sources with realistic light sources of varying intensities. Instead of active modulation, the passive decoy-state method employs built-in decoy states in a parametric down-conversion photon source, which can decrease the side channel information leakage in decoy-state preparation and hence increase the security. By employing low dark count up-conversion single photon detectors, we experimentally demonstrate the passive decoy-state method over a 50 km long optical fiber and obtain a key rate of about 100 bit s−1. Our result suggests that the passive decoy-state source is a practical candidate for future quantum communication implementation.