Quantum key distribution over 122 km of standard telecom fiber

被引：541

作者：

Gobby, C

Yuan, ZL

Shields, AJ

机构：

[1] Toshiba Res Europe Ltd, Cambridge Res Lab, Cambridge CB4 0WE, England

[2] Univ Cambridge, Cavendish Lab, Dept Phys, Cambridge CB3 0HE, England

来源：

APPLIED PHYSICS LETTERS | 2004年 / 84卷 / 19期

关键词：

D O I：

10.1063/1.1738173

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report a demonstration of quantum key distribution over a standard telecom fiber exceeding 100 km in length. Through careful optimization of the interferometer and single photon detector, we achieve a quantum bit error ratio of 8.9% for a 122 km link, allowing a secure shared key to be formed after error correction and privacy amplification. Key formation rates of up to 1.9 kbit/s are achieved depending upon fiber length. We discuss the factors limiting the maximum fiber length in quantum cryptography. (C) 2004 American Institute of Physics.

引用

页码：3762 / 3764

页数：3

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