基于传送带量子纠缠光的卫星钟差测量

Satellite Clock Offset Measurement Based on Conveyor Belt Quantum Entangled Light

卫星钟差确定受限于经典测量的散粒噪声极限,钟差测量精度仅为ns量级。基于军民领域对高精度时间基准的迫切需求,提出了一种基于双路六延迟传送带量子纠缠光的卫星钟差测量方案,并且该方案以传送带协议为基础。首先,通过自发参量下转换制备了频率纠缠光信号。然后,利用HOM(Hong-Ou-Mandel)干涉仪对频率纠缠光信号进行了二阶关联检测解算,进而得到了钟差信息。最后,仿真分析了相关参数对钟差测量的影响。所提方案无需进行到达时间测量,不受色散效应及星地距离的影响,在理论上可以实现ps量级的卫星钟差测量。

The determination of satellite clock offset is limited by the shot noise limit of classical measurement,and the accuracy of clock offset measurement is only on the order of ns.Based on the urgent demand for high-precision time reference in the military and civilian fields,a satellite clock offset measurement scheme based on dual-channel six-delay conveyor belt quantum entangled light is proposed,and the proposed scheme is based on the conveyor belt protocol.First,the frequency entangled optical signal is prepared by spontaneous parameter down-conversion.Then,the second-order correlation detection solution of the frequency entangled optical signal is carried out by using the HOM(Hong-Ou-Mandel)interferometer to obtain the clock offset information.Finally,the influence of related parameters on the clock offset measurement is simulated and analyzed.The proposed scheme does not need to measure the arrival time,is not affected by the dispersion effect and the distance between the satellite and the ground,and can theoretically realize satellite offset error measurement of the order of ps.