TDC-GPX-based synchronization scheme for QKD system  

作　　者：Lian-Jun Jiang Shi-Biao Tang Ze-Jie Yin 

机构地区：[1]State Key Laboratory of Particle Detection and Electronics,University of Science and Technology of China [2]Department of Modern Physics, University of Science and Technology of China

出　　处：《Nuclear Science and Techniques》2016年第1期88-92,共5页核技术（英文）

基　　金：supported by National Natural Science Foundation of China (Nos. 11375195, 11375263 and 11105143);National Magnetic Confinement Fusion Energy Development Research (No. 2013GB104003)

摘　　要：To meet the needs of signal alignment between the transmitter and receiver in a quantum key distribution(QKD) system, we put forward a TDC-GPX-based synchronization scheme, which is based on high-precision time measurement. We send a low-frequency repeat optical pulse synchronized with associated quantum signals on the receiver's side by using a time-to-digital converter(TDC)module, the time intervals between quantum signals, and synchronization signals measured and converted to corresponding temporal orders to complete the synchronization.We state the principle of the synchronization scheme in detail and then verify it in an actual QKD test bed. The test results show that our TDC-GPX-based synchronization can obtain a time resolution better than 100 ps, and the proposed scheme shows full feasibility for an actual QKD system.To meet the needs of signal alignment between the transmitter and receiver in a quantum key distribution （QKD） system, we put forward a TDC-GPX-based syn- chronization scheme, which is based on high-precision time measurement. We send a low-frequency repeat optical pulse synchronized with associated quantum signals on the receiver＇s side by using a time-to-digital converter （TDC） module, the time intervals between quantum signals, and synchronization signals measured and converted to corre- sponding temporal orders to complete the synchronization. We state the principle of the synchronization scheme in detail and then verify it in an actual QKD test bed. The test results show that our TDC-GPX-based synchronization can obtain a time resolution better than 100 ps, and the pro- posed scheme shows full feasibility for an actual QKD system.

关 键 词：TDC QKD GPX 同步 系统 量子密钥分配 时间数字转换器 信号调整 

分 类 号：O413[理学—理论物理] TN918.4[理学—物理]