An autocompensating fiber-optic quantum cryptography system based on polarization splitting of light
An autocompensating fiber-optic quantum cryptography system based on polarization splitting of light
复制标题
DOI：
10.1109/3.825881
复制
发表时间：
2000-03
影响因子：
2.5
通讯作者：
Donald S. Bethune;William P. Risk
中科院分区：
文献类型：
--
作者：
Donald S. Bethune;William P. Risk
我们已经开发了一种基于标准通信激光器、探测器和光纤的量子密钥分配（QKD）系统，该系统被动地补偿由于应力、温度变化或双折射而引起的光纤路径的时间相关变化。这种方法允许在施加在单光子级脉冲上的相移中编码的信息在经过许多公里的不受控制的光纤传输后被准确地读出。冷却InGaAs雪崩光电二极管，脉冲偏置使用一个特殊的噪声消除电路，用于检测单个1.31-/spl μ/m的红外光子，具有高效率，低暗计数率，和亚纳秒时间分辨率。单根光纤在两个终端站之间传输量子信息和精确的1.55 /spl mu/m定时脉冲。终端站活动的整体同步、基础选择的公开讨论、纠错和隐私放大都已通过局域网（LAN）实现。该系统目前在10公里单模光纤链路上分别以/spl sim/1000、600和200位/秒的速率生成原始、纠错和隐私放大的密钥数据。
We have developed a system for quantum key distribution (QKD), based on standard telecommunication lasers, detectors, and optical fiber, that passively compensates for time-dependent variations of the fiber-optic path due to stress, temperature changes, or birefringence. This approach allows information encoded in phase shifts imposed on single-photon-level pulses to be accurately read out after transmission over many kilometers of uncontrolled fiber. Cooled InGaAs avalanche photodiodes, pulse-biased using a special noise canceling circuit, are used to detect single 1.31-/spl mu/m infrared photons with a high efficiency, low dark-count rate, and subnanosecond time resolution. A single optical fiber carries both the quantum information and precise 1.55 /spl mu/m timing pulses between the two end stations. Overall synchronization of end-station activities, public discussion of basis choices, error correction, and privacy amplification have all been implemented over a local area network (LAN). The system at present generates raw, error-corrected, and privacy-amplified key data at rates of /spl sim/1000, 600, and 200 bits/s, respectively, over a 10-km single-mode fiber link.