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针对卫星量子通信中的偏振保持问题,研究了大气散射、大气湍流以及卫星与地面站间相对运动对量子偏振态的影响。提出了一种采用量子同步修正比特存储信道偏振影响,而后对数据比特进行修正变换的偏振补偿算法。仿真对比了补偿前后系统量子误码率(QBER),补偿后系统量子QBER可低至0.7%,表明本文方案具有较好的偏振补偿效果,可实现安全有效的卫星量子通信,且无需对系统增加任何附加设备。
Aiming at the problem of polarization preservation in satellite quantum communication, the influence of atmospheric scattering, atmospheric turbulence and the relative motion between satellite and ground station on the state of polarization of quantum are studied. A polarization compensation algorithm using quantum synchronization to correct the influence of bit storage channel polarization and then to modify the data bits is proposed. The QBER of the system before and after compensation is compared by simulation. After the compensation, the QBER of the system can be as low as 0.7%. It shows that the proposed scheme has good polarization compensation effect and can achieve safe and effective satellite quantum communication without the need of system increase Any additional equipment.