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基于Fabry-Perot(FP)腔的量子密钥分配系统在相位编码的量子密钥分配应用方面具有优势,把FP腔锁定在携带密钥信息的单光子光学频率上决定着密钥的实用安全.提出利用单光子调制解调的方法锁定FP腔.使用工作于盖革模式的单光子探测器探测单光子(平均光子数为0.1),对离散的单光子响应脉冲累计锁定放大,获得的鉴频信号信噪比达112,锁定后FP腔透射光频率起伏为2 MHz.
The quantum key distribution system based on Fabry-Perot (FP) cavity has advantages in the application of quantum key distribution for phase encoding. Locking the FP cavity to the single-photon optical frequency with key information determines the practical security of the key. A single-photon detector working in Geiger mode is used to detect one-photon (the average number of photons is 0.1), and the discrete single-photon response pulse is locked and amplified. The obtained frequency discrimination Signal to noise ratio of 112, after locking FP cavity transmitted light frequency fluctuation of 2 MHz.