A highly stable differential phase shift key distribution QKD system

被引：10

作者：

Li Ming-Ming ^{[1
]}

Wang Fa-Qiang ^{[1
]}

Lu Yi-Qun ^{[1
]}

Zhao Feng ^{[1
]}

Chen Xia ^{[1
]}

Liang Rui-Sheng ^{[1
]}

Liu Song-Hao ^{[1
]}

机构：

[1] S China Normal Univ, Sch Informt & Optoelect Sci & Engn, Lab Photon Informat Technol, Guangzhou 510631, Peoples R China

来源：

ACTA PHYSICA SINICA | 2006年 / 55卷 / 09期

关键词：

quantum cryptography; quantum key distribution; differential phase shift;

D O I：

10.7498/aps.55.4642

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We propose and demonstrate an improved differential phase shift key distribution scheme. Alice uses a pulsed laser source and two cascaded fiber loops to get coherent pulses, then modulates them randomly under differential phase shift scheme, which compensates for the random polarization mode dispersion and phase shift. An interferometer made up of two Faraday mirrors is employed to detect single photon under gate mode. In one-way transmission, QKD is free from Trojan attack. Our experiment at setup can work stably for a long time (at least 24h) with an error ratio of 3%. The stable scheme is efficient, economical and favorable for practical application.

引用

页码：4642 / 4646

页数：5

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