Autocompensating quantum cryptography
Autocompensating quantum cryptography
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DOI：
10.1088/1367-2630/4/1/342
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发表时间：
2002-04
影响因子：
3.3
通讯作者：
D. Bethune;W. Risk
中科院分区：
文献类型：
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作者：
D. Bethune;W. Risk
量子加密密钥分发 (QKD) 使用极微弱的光脉冲在两方（Alice 和 Bob）之间携带量子信息，使他们能够生成共享的秘密加密密钥。自动补偿 QKD 系统通过将信息编码为通过光纤往返发送并在中途使用法拉第镜反射的光脉冲的正交偏振分量之间的差分相位，自动且被动地补偿光纤属性不受控制的时间相关变化。我们构建了一个基于标准电信技术的原型系统，可在 10 公里光纤链路上实现约 1000 位 s-1 的隐私放大比特生成率。量子密码学是一个应用示例，它通过使用单个粒子的量子态来表示信息，完成使用经典方法不可能完成的实际任务。
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 ~1000 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.