论文部分内容阅读
为了研究暴风雪对自由空间量子通信信道的影响,根据暴风雪的物理性质,将暴风雪的强度分为4个等级,首先提出了暴风雪天气等级与自由空间量子信道衰减的关系;针对退极化信道和相位衰减信道,分别建立了不同等级的暴风雪天气与信道纠缠度、信道保真度的模式方程;最后,分析了不同等级暴风雪对量子信道可用时间利用率的影响。数值分析及仿真结果表明,当暴风雪天气等级由1增加到4时,自由空间量子通信信道衰减由0.9增加到13;信道纠缠度由0.93减小到0.25,保真度由0.97衰减至0.85;信道的可用时间利用率由0.88降低到0.37。因此,为了提高自由空间量子通信的可靠性,应根据暴风雪天气灾害程度,自适应调整系统的各项参数。
In order to study the influence of blizzard on free space quantum communication channel, according to the physical properties of blizzard, the intensity of blizzard is divided into four levels. Firstly, the relationship between the blizzard weather level and quantum channel attenuation in free space is proposed. For the depolarization channel and phase Attenuation of the channel, different levels of snow storm weather and channel entanglement, channel fidelity model equations were established. Finally, the impact of different levels of snowstorms on the available time utilization of the quantum channel was analyzed. Numerical analysis and simulation results show that when the snowstorm level increases from 1 to 4, the decay of free space quantum communication channel increases from 0.9 to 13, the channel entanglement decreases from 0.93 to 0.25 and the fidelity decays from 0.97 to 0.85. The channel The available time utilization decreased from 0.88 to 0.37. Therefore, in order to improve the reliability of quantum communication in free space, the parameters of the system should be adaptively adjusted according to the degree of snowstorm disasters.