Wang Qin, Chen Wei, Xavier Guilherme, Swillo Marcin, Zhang Tao, Sauge Sebastien, Tengner Maria, Han Zheng-Fu, Guo Guang-Can, Karlsson Anders
Department of Physics, Key Laboratory of Quantum Information, CAS, USTC, 230026, Hefei, China.
Phys Rev Lett. 2008 Mar 7;100(9):090501. doi: 10.1103/PhysRevLett.100.090501. Epub 2008 Mar 5.
We have experimentally demonstrated a decoy-state quantum key distribution scheme (QKD) with a heralded single-photon source based on parametric down-conversion. We used a one-way Bennett-Brassard 1984 protocol with a four states and one-detector phase-coding scheme, which is immune to recently proposed time-shift attacks, photon-number splitting attacks, and can also be proven to be secure against Trojan horse attacks and any other standard individual or coherent attacks. In principle, the setup can tolerate the highest losses or it can give the highest secure key generation rate under fixed losses compared with other practical schemes. This makes it a quite promising candidate for future quantum key distribution systems.
我们通过实验证明了一种基于参量下转换的带 heralded 单光子源的诱骗态量子密钥分发方案（QKD）。我们使用了具有四态和单探测器相位编码方案的单向 Bennett-Brassard 1984 协议，该协议对最近提出的时间偏移攻击、光子数分裂攻击具有免疫能力，并且还可以证明对特洛伊木马攻击和任何其他标准的个体或相干攻击是安全的。原则上，与其他实际方案相比，该装置能够容忍最高的损耗，或者在固定损耗下能够给出最高的安全密钥生成率。这使其成为未来量子密钥分发系统的一个非常有前途的候选方案。
