Real-time compensation of phase drift for phase-encoded quantum key distribution systems

被引：15

作者：

Zhang LiJun ^{[1
]}

Wang YongGang ^{[1
]}

Yin ZhenQiang ^{[2
]}

Chen Wei ^{[2
]}

Yang Yang ^{[1
]}

Zhang Tao ^{[1
]}

Huang DaJun ^{[1
]}

Wang Shuang ^{[2
]}

Li FangYi ^{[2
]}

Han ZhengFu ^{[2
]}

机构：

[1] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Peoples R China

[2] Univ Sci & Technol China, Key Lab Quantum Informat, Hefei 230026, Peoples R China

来源：

CHINESE SCIENCE BULLETIN | 2011年 / 56卷 / 22期

基金：

中国国家自然科学基金;

关键词：

quantum key distribution; phase-coding; phase drift; active phase compensation; four-phase scanning method; FPGA; CRYPTOGRAPHY; LONG;

D O I：

10.1007/s11434-011-4570-4

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Phase drift is an inherent problem in phase-encoded quantum key distribution (QKD) systems. The current active phase tracking and compensation solutions cannot satisfy the requirements of a system with nonlinearity in phase modulation. This paper presents a four-phase scanning method, which is based on the quantitative analysis of the quantum bit error rate (QBER) from phase drift and the performance requirements of phase compensation. By obtaining the four interference fringes and adjusting the coding matrix of the system, this method automatically calculates the accurate driving voltages for the phase modulator. The implementation and experimental tests show that the proposed method can compensate phase drift caused by environmental changes and the system's nonlinearity, and is applicable to large-scale QKD networks.

引用

页码：2305 / 2311

页数：7

共 20 条

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