Experimental long-distance decoy-state quantum key distribution based on polarization encoding.
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.
Peng
Cheng-Zhi
CZ
Department of Physics, Tsinghua University, Beijing, China.
Zhang
Jun
J
Yang
Dong
D
Gao
Wei-Bo
WB
Ma
Huai-Xin
HX
Yin
Hao
H
Zeng
He-Ping
HP
Yang
Tao
T
Wang
Xiang-Bin
XB
Pan
Jian-Wei
JW