A quantum key distribution system based on two polarization beam splitters

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Abstract
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.

Keywords:
quantum key distribution /

polarization beam splitter /

single photon interference
Authors and contacts
Ma Hai-Qiang¹,

Li Ya-Ling²,

Zhao Huan³,

Wu Ling-An¹

(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
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