摘要
量子卫星通信是全球化量子保密通信网的重要组成部分。为了研究降雪对量子卫星通信性能的影响,首先基于雪粒子的Gamma谱分布函数及Mie散射理论,建立了降雪环境下光量子的能量衰减模型;然后分别研究了降雪强度等参数与星地链路的保真度、信道建立速率和信道纠缠度之间的关系,并进行了数值仿真;最后为准确模拟降雪干扰对星地链路通信性能的影响,引入了加权噪声信道模型,分析了降雪对加权噪声信道容量的影响。结果表明,降雪强度对光量子能量及保真度都有显著的影响:当传输距离为4.1 km、降雪强度由2.82 mm/d增加到8.71 mm/d时,纠缠度由0.738衰减到0.206;当降雪强度由3.75 mm/d增加至8.25 mm/d时,信道建立速率由16.84 pair/s减小至7.76 pair/s;当传输距离为2.5 km、降雪强度从4.0 mm/d增大到8.5 mm/d时,加权噪声信道容量由0.6207减小至0.3547。因此,降雪对量子卫星通信系统的影响不容忽视,需要根据降雪等级情况,采取相应调整策略保证通信的可靠性和有效性。
Quantum satellite communication is an important part of global quantum secure communication network.In order to study the effect of snowfall on quantum satellite communication performance,first,based on the Gamma spectrum distribution function of snow particles and Mie scattering theory,the energy attenuation model of light quantum in snowfall environment is established.Then the relationship between the parameters such as snowfall intensity and the fidelity of the satellite-ground link,the channel establishment rate and the channel entanglement is studied,and the numerical simulation is carried out.Finally,in order to accurately simulate the impact of snow interference on the communication performance of satellite-ground links,a weighted noise channel model is introduced,and the impact of snow on the weighted noise channel capacity is analyzed.The results show that the snowfall intensity has a significant effect on the quantum energy and fidelity of light.When the transmission distance is 4.1 km and the snowfall intensity increases from 2.82 mm/d to 8.71 mm/d,the entanglement decreases from 0.738 to 0.206.When the snowfall intensity increases from 3.75 mm/d to 8.25 mm/d,the channel establishment rate decreases from 16.84 pair/s to 7.76 pair/s.When the transmission distance is 2.5 km and the snowfall intensity increases from 4.0 mm/d to 8.5 mm/d,the weighted noise channel capacity decreases from 0.6207 to 0.3547.Therefore,the impact of snowfall on quantum satellite communication system cannot be ignored,and corresponding adjustment strategies should be taken to ensure the reliability and effectiveness of communication according to the snowfall level.
作者
薛长春
聂敏
杨光
张美玲
孙爱晶
裴昌幸
Xue Changchun;Nie Min;Yang Guang;Zhang Meiling;Sun Aijing;Pei Changxing(School of Communications and Information Engineering&School of Artificial Intelligence,Xi’an University of Posts&Telecommunications,Xi’an 710121,Shaanxi,China;State Key Laboratory of Air-Earth Integrated Service Network,Xidian University,Xi’an 710071,Shaanxi,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2023年第23期280-287,共8页
Laser & Optoelectronics Progress
基金
国家自然科学基金(61971348,61201194)
陕西省国际科技合作与交流计划项目(2015KW-013)
陕西省自然科学基础研究计划(2021JM-464)。
关键词
量子光学
降雪
纠缠度
信道建立速率
保真度
加权噪声信道
quantum optics
snowfall
entanglement
channel establishment rate
fidelity
weighted noise channel
