2 GHz clock quantum key distribution over 260 km of standard telecom fiber

被引：222

作者：

Wang, Shuang ^{[1
]}

Chen, Wei ^{[1
]}

Guo, Jun-Fu ^{[2
]}

Yin, Zhen-Qiang ^{[1
]}

Li, Hong-Wei ^{[1
]}

Zhou, Zheng ^{[1
]}

Guo, Guang-Can ^{[1
]}

Han, Zheng-Fu ^{[1
]}

机构：

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

[2] Anhui Asky Quantum Technol Co Ltd, Wuhu 241002, Peoples R China

来源：

OPTICS LETTERS | 2012年 / 37卷 / 06期

基金：

国家高技术研究发展计划(863计划); 中国国家自然科学基金;

关键词：

CRYPTOGRAPHY; DETECTORS;

D O I：

10.1364/OL.37.001008

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report a demonstration of quantum key distribution (QKD) over a standard telecom fiber exceeding 50 dB in loss and 250 km in length. The differential phase shift QKD protocol was chosen and implemented with a 2 GHz system clock rate. By careful optimization of the 1 bit delayed Faraday-Michelson interferometer and the use of the superconducting single photon detector (SSPD), we achieved a quantum bit error rate below 2% when the fiber length was no more than 205 km, and of 3.45% for a 260 km fiber with 52.9 dB loss. We also improved the quantum efficiency of SSPD to obtain a high key rate for 50 km length. (C) 2012 Optical Society of America

引用

页码：1008 / 1010

页数：3

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