在量子保密通信蓬勃发展的今天,基于自由空间的量子密钥分发是一个重要的研究方向。 它将在未来全球量子通信网络中扮演重要的角色。介绍了自由空间量子密钥分发控制系统中的电子学设计, 选用Xilinx公司的VirtexII-Pro系列芯片,使用内部的PowerPC405嵌入式硬核加上功能逻辑模块 实现最终量子密钥的提取和外围电路的控制,提高了全系统的集成度和可靠性。该设计成功应用 于白天1 km量子密钥分发实验,成码率大于1.5 kbps。

With the booming development of quantum cryptography, the free-space quantum key distribution is an important research branch. It will play a critical role in the future global quantum communication. The electronic design of quantum key distribution (QKD) control system based was presented on a Xilinx’s VirtexII-Pro series chip. Extracting final quantum key and controlling peripheral circuit were implemented with the combination of the embedded hard core PowerPC405 in FPGA and the logic module designed by very-high-speed integrated circuits hardware description language (VHDL). The design was applied in the 1 km QKD distribution experiment during daytime, and its final key rate was greater than 1.5 kbps.