A quantum key distribution system based on two polarization beam splitters
Ma Hai-Qiang, Yaling Li, Huan Zhao, Ling-An Wu, (1)中国科学院物理研究所光物理开放实验室, 北京 100080; (2)中国科学院物理研究所光物理开放实验室, 北京 100080;北京交通大学, 北京 100044; (3)中国科学院物理研究所光物理开放实验室, 北京 100080;东南大学, 南京 210096 · Acta Physica Sinica · 2005
We present a quantum key distribution system based on two polarization beam splitters, by means of which the phase modulator's polarization dependence is cancelled out. A high key generation rate has been obtained for the first time at 1310nm transmitted over a 25 km long fiber, with a fringe visibility of 99.4%. A sifted key rate of about 0.6 kbits/s and quantum bit error rate of about 0.5% are obtained.