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Experimental Long-Distance Decoy-State Quantum Key Distribution Based on Polarization Encoding

2007; American Physical Society; Volume: 98; Issue: 1 Linguagem: Inglês

10.1103/physrevlett.98.010505

1092-0145

Cheng-Zhi Peng, Jun Zhang, Dong Yang, Weibo Gao, Huai-Xin Ma, Hao Yin, Heping Zeng, Tao Yang, Xiang‐Bin Wang, Jian-Wei Pan,

Quantum optics and atomic interactions

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.