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介绍了量子密钥分发(QKD)系统及该系统中的单光子探测器,说明了为降低单光子探测器的暗计数而开发的收发端的激光同步系统。该同步系统由同步激光发射与接收方的激光甄别器组成,详细讲述了其中的同步激光甄别器各部分的制作,包括光电转换器、前置放大器、电压甄别器、电平转换电路4个部分。给出了最终的测试情况,通过长时间的测试实验证实了其工作稳定可靠、甄别性能良好,未发现误触发和漏触发。目前,该同步信号甄别器已成功地应用于量子密钥分发系统中,很好地实现了收发双方的同步,保证了单光子探测器的低暗计数和成码率。
The Quantum Key Distribution (QKD) system and the single photon detector in this system are introduced, and the receiving and sending laser synchronization system developed to reduce the dark counting of single photon detectors is described. The synchronization system is composed of a laser discriminator of a synchronous laser transmitter and a receiver, and details the manufacture of each part of the synchronous laser discriminator, including four parts of a photoelectric converter, a preamplifier, a voltage discriminator and a level shift circuit . The final test case is given. Through a long time of test, it has been proved that its work is stable and reliable, the screening performance is good, no false triggering and missed triggering are found. At present, the synchronization signal discriminator has been successfully applied to the quantum key distribution system, and the synchronization between the sender and the receiver is well achieved, ensuring the low dark count and the coding rate of the single photon detector.