Security of counterfactual quantum cryptography
Security of counterfactual quantum cryptography
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DOI：
10.1103/physreva.82.042335
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发表时间：
2010-10-27
影响因子：
2.9
通讯作者：
Guo, Guang-Can
中科院分区：
文献类型：
--
作者：
Yin, Zhen-Qiang;Li, Hong-Wei;Guo, Guang-Can
最近，T. G. Noh [Phys. Rev. Lett. 103，230501（2009）]。在该方案中，即使信息载体不在量子信道中传输，两个合法的远端节点也可以共享密钥。我们发现，该协议是等价的纠缠蒸馏协议。根据这个等价性，当采用理想单光子源时，得到了严格的安全性证明和渐近密钥比特率，并且可以检测到特洛伊木马攻击。我们还发现该方案的安全性不仅与误码率有关，而且与光子产额有关。我们的安全证明可能会对其他双向协议的安全性有所启发。
Recently, a "counterfactual" quantum-key-distribution scheme was proposed by T.-G. Noh [Phys. Rev. Lett. 103, 230501 (2009)]. In this scheme, two legitimate distant peers may share secret keys even when the information carriers are not traveled in the quantum channel. We find that this protocol is equivalent to an entanglement distillation protocol. According to this equivalence, a strict security proof and the asymptotic key bit rate are both obtained when a perfect single-photon source is applied and a Trojan horse attack can be detected. We also find that the security of this scheme is strongly related to not only the bit error rate but also the yields of photons. And our security proof may shed light on the security of other two-way protocols.