量子电子学报2024，Vol.41Issue(6)：933-941,9.DOI:10.3969/j.issn.1007-5461.2024.06.010
时频域结合的量子通信时间同步方法
Time synchronization method for quantum communication based on time-frequency domain
摘要
Abstract
Time synchronization is crucial for satellite-to-ground quantum key distribution(QKD).To overcome the noise interference and the loss of quantum light signal in satellite-to-ground QKD,previous schemes used global positioning system(GPS)equipment to assist synchronous light mapping.In order to reduce the complexity and cost of the system,a time synchronization method combining time domain and frequency domain is proposed in this paper.The method utilizes the spectral characteristics of quantum light and linear fitting method to achieve high precision time synchronization.The method is tested with the experimental data of satellite-to-ground QKD,a synchronization accuracy of 1.03 ns can be achieved,and a full width at half maximum of the histogram is 1.4 ns.The method does not require the use of GPS and synchronous light,and can be widely used in satellite-to-ground QKD.关键词
量子光学/时钟自恢复/线性拟合/量子密钥分发/时间同步Key words
quantum optics/clock self-recovery/linear fitting/quantum key distribution/time synchronization分类
数理科学引用本文复制引用
沈威,刘尉悦..时频域结合的量子通信时间同步方法[J].量子电子学报,2024,41(6):933-941,9.基金项目
浙江省自然科学基金(LY21F050003) （LY21F050003）
