Autocompensating quantum cryptography

被引：52

作者：

Bethune, DS ^{[1
]}

Risk, WP ^{[1
]}

机构：

[1] IBM Corp, Almaden Res Ctr, San Jose, CA 95120 USA

来源：

NEW JOURNAL OF PHYSICS | 2002年 / 4卷

关键词：

D O I：

10.1088/1367-2630/4/1/342

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Quantum cryptographic key distribution (QKD) uses extremely faint light pulses to carry quantum information between two parties (Alice and Bob), allowing them to generate a shared, secret cryptographic key. Autocompensating QKD systems automatically and passively compensate for uncontrolled time-dependent variations of the optical fibre properties by coding the information as a differential phase between orthogonally polarized components of a light pulse sent on a round trip through the fibre, reflected at mid-course using a Faraday mirror. We have built a prototype system based on standard telecom technology that achieves a privacy-amplified bit generation rate of similar to1000 bits s(-1) over a 10 km optical fibre link. Quantum cryptography is an example of an application that, by using quantum states of individual particles to represent information, accomplishes a practical task that is impossible using classical means.

引用

页码：42.1 / 42.15

页数：15

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