A stable long-distance quantum key distribution system

被引：15

作者：

Wu, G ^{[1
]}

Zhou, CY ^{[1
]}

Chen, XL ^{[1
]}

Han, XH ^{[1
]}

Zeng, HP ^{[1
]}

机构：

[1] E China Normal Univ, Dept Phys, Key Lab Opt & Magnet Resonance Spect Minist Educ, Shanghai 200062, Peoples R China

来源：

ACTA PHYSICA SINICA | 2005年 / 54卷 / 08期

关键词：

quantum cryptography; quantum key distribution; single-photon detection;

D O I：

10.7498/aps.54.3622

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A stable long-distance quantum key distribution system which has been just completed in our laboratory is demonstrated in this paper. The idea of "plug and play" was adopted to automatically compensate the polarization mode dispersion and phase shift. A symmetrical capacitance-balance technique and magic-T network were used in the single-photon detection module, wherein a detection efficiency of more than 5% and a dark count probability of lower than 2.9 x 10(-6)/pulse were achieved. As a result, we have realized stable (longer than 12 h) quantum key distribution experiment in 50.6 km single mode fiber with mean photon number of 0.07 and quantum bit error rate of 4%.

引用

页码：3622 / 3626

页数：5

共 15 条

[1]

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[2] QUANTUM CRYPTOGRAPHY USING ANY 2 NONORTHOGONAL STATES [J].