目前罗兰C台链中所有台站受到原子钟积累误差和无线电信号测量精度限制,并没有实现高精度时间同步。基于连续变量纠缠交换方式和位于主副台的延迟装置,可以高精度检测纠缠光场正交分量的相位差信息,从而得到主台和多个副台的同步时差信息。经过理论推导和仿真分析可知,利用所提方案能使多台站同步精度达到皮秒级别。通过分析台间同步量子信道的安全性可知,任何外界窃听行为都将导致主副台误码率提高。

At present, all stations in the Loran C chain are limited by the accumulation errors of atomic clock and the measurement accuracy of radio signal, and there has not been achieved high-precision time synchronization so far. Based on the continuous variable entanglement swapping method and the delay device located at the main and auxiliary stations, the phase difference information of the orthogonal components of the entangled light field can be detected with high precision to obtain synchronization time difference information of the main station and the multiple of secondary stations. Through theoretical derivation and simulation analysis, it is concluded that the synchronization accuracy of multiple stations can reach the picosecond level. By analyzing the security of the inter-station synchronous quantum channel, it is concluded that any external eavesdropping behavior will lead to the raise of bit error rate of the main and auxiliary stations.