Peng Cheng-Zhi, Zhang Jun, Yang Dong, Gao Wei-Bo, Ma Huai-Xin, Yin Hao, Zeng He-Ping, Yang Tao, Wang Xiang-Bin, Pan Jian-Wei
Department of Physics, Tsinghua University, Beijing, China.
Phys Rev Lett. 2007 Jan 5;98(1):010505. doi: 10.1103/PhysRevLett.98.010505.
We demonstrate the decoy-state quantum key distribution (QKD) with one-way quantum communication in polarization space over 102 km. Further, we simplify the experimental setup and use only one detector to implement the one-way decoy-state QKD over 75 km, with the advantage to overcome the security loopholes due to the efficiency mismatch of detectors. Our experimental implementation can really offer the unconditionally secure final keys. We use 3 different intensities of 0, 0.2, and 0.6 for the light sources in our experiment. In order to eliminate the influences of polarization mode dispersion in the long-distance single-mode optical fiber, an automatic polarization compensation system is utilized to implement the active compensation.
我们展示了在偏振空间中通过单向量子通信实现的超过102公里的诱骗态量子密钥分发（QKD）。此外，我们简化了实验装置，仅使用一个探测器实现了超过75公里的单向诱骗态QKD，其优势在于克服了由于探测器效率不匹配导致的安全漏洞。我们的实验实现能够真正提供无条件安全的最终密钥。在我们的实验中，光源使用了0、0.2和0.6三种不同强度。为了消除长距离单模光纤中偏振模色散的影响，利用自动偏振补偿系统进行有源补偿。
