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自由空间量子密钥分布系统是全球性量子保密通信的关键组成部分之一。因此研究湍流大气信道对量子密钥分布系统性能的影响就非常重要。使用光束近场传播和统计分析的方法定量分析了湍流大气信道对基于BB84协议的自由空间量子密钥分布系统的误码率的影响。数值计算结果表明,大气衰减系数超过-3dB/km时,大气衰减对量子密钥分布系统的误码率影响很大;在大气传输因子小于0.5的区域,系统误码率比无湍流影响时的系统误码率高出一个数量级。
The free-space quantum key distribution system is one of the key components of global quantum secure communications. Therefore, it is very important to study the influence of turbulent atmospheric channel on the performance of quantum key distribution system. The effects of turbulent atmospheric channels on the bit error rate of the free-space quantum key distribution system based on the BB84 protocol were quantitatively analyzed using the method of beam near-field propagation and statistical analysis. The numerical results show that the atmospheric attenuation coefficient has a great influence on the error rate of the quantum key distribution system when the atmospheric attenuation coefficient exceeds -3dB / km. In the area where the atmospheric transmission factor is less than 0.5, the system error rate is higher than that of the system without turbulence System error rate is an order of magnitude higher.