| 摘要: |
| 高精度时间同步是量子密钥分发系统成码的关键，提高时间分辨精度能够降低系统误码率。根据同步光时延调节原理，提出了一种用于量子密钥分发系统的同步光时延调节方法，首先，进行单光子探测器的触发门控延时调节；其次，进行探测器输出数据时间与接收端处理程序接收数据时间对准调节。通过搭建量子密钥分发实物系统，进行了同步光路自身时间精度0.789 ns和量子通信系统时间精度131.99 ns的指标测试。进一步分析了系统时间精度对误码率的影响，并测试了系统误码率不高于1%，为后续成码率的提高奠定了基础。不仅有利于提高通信的安全性和效率，还可以为航空航天的关键任务提供坚实基础。随着技术的进一步发展，量子密钥分发系统在航天领域拥有广阔的应用前景。 |
| 关键词: 时延调节 时间精度 对准接收 误码率 |
| DOI： |
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| 基金项目:中国航天科技集团公司自主研发项目 |
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| Research of the Synchronous Optical Delay Regulation for Quantum Key Distribution System |
| LIU Shuang,SUN Xiaojie,CUI Dou,WANG Xuefeng,ZHU Ling |
| (1.Beijing Institute of Aerospace Control Devices, Beijing 100039，China;2.Quantum Engineering Research Center of CASC, Beijing 100094，China) |
| Abstract: |
| High precision time synchronization is the key to the coding of quantum key distribution system.Improving time resolution accuracy can reduce the quantum bit error rate of the system.According to the principle of synchronous optical delay regulation, a method of synchronous optical delay regulation for quantum key distribution system is proposed in this paper.Firstly, the trigger gate delay is adjusted for single photon detector, and then the detector output data time is adjusted for receiving data time by the receiver processor.By building the quantum key distribution system, the index test of the synchronization optical paths own accuracy of 0.789 ns and the quantum communication systems time accuracy of 131.99 ns is carried out.The influence of system time accuracy on bit error rate is further analyzed, and the quantum bit error rate of the system is tested to be less than 1%, which lays a foundation for the improvement of the subsequent code formation rate.It is not only conducive to improving the safety and efficiency of communications, but also provides a solid foundation for critical missions in aerospace.With the further development of technology, quantum key distribution system has a broad application prospect in the field of aerospace. |
| Key words: Delay regulation Time accuracy Alignment reception Quantum bit error rate |