冰水混合云对量子卫星通信性能的影响  

Influences of the Ice-water Mixed Clouds on the Performance of Quantum Satellite Communication

作　　者：聂敏[1] 任家明[1] 杨光[1,2] 张美玲[1] 裴昌幸[3] 

机构地区：[1]西安邮电大学通信与信息工程学院,西安710121 [2]西北工业大学电子信息学院,西安710072 [3]西安电子科技大学综合业务网国家重点实验室,西安710071

出　　处：《光子学报》2016年第9期52-58,共7页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.61172071;61201194);陕西省自然科学基础研究计划(No.2014JQ8318);陕西省国际科技合作与交流计划项目(No.2015KW-013)资助~~

摘　　要：根据冰-水混合云中冰晶和水滴粒子的谱分布函数及消光因子,得到冰-水混合云的冰水含量比例与量子卫星通信信道之间的衰减关系;针对比特翻转信道和退极化信道,分别建立冰水含量比例与信道容量、信道保真度之间的方程;分析了冰水含量比例对信道建立速率的影响.仿真结果表明:当冰水含量比例分别为1∶2和1∶9时,比特翻转信道、退极化信道的容量分别为0.65和0.92、0.59和0.95;当信源字符的概率为0.9时,比特翻转信道、退极化信道的保真度分别为0.60和0.83、0.89和0.95;当传输距离为2km,纠缠粒子对保真度为0.8时,信道建立速率分别为7.40 Hz和15.57 Hz.因此,当量子卫星信号出现较大衰减时,应根据冰-水混合云的冰水含量比例,自适应调整量子卫星通信系统的各项参量,以提高量子卫星通信的可靠性.According to the spectral distribution function and the extinction factor of the ice crystal and the water droplet in the ice-water mixed clouds,the attenuation relationships between the ratio of ice and water and the channel of the quantum satellite communication were attained.For the bit flipping channels and the depolarizing channels,the equations between the ratio of ice and water and the channel capacity,and the channel average fidelity were established respectively.The effect of the ratio of ice and water in the ice-water mixed clouds on the quantum channel establishing rate was analyzed.The simulation results show that,when the ratio of ice and water in the ice-water mixed clouds is 1∶2and 1∶9,for the bit flipping channel,the channel capacity is 0.65 and 0.92,and for the depolarizing channel that is 0.59and0.95 respectively.When the probability of the source character is 0.9,for the bit flipping channel,the channel average fidelity is 0.60 and 0.83,and for the depolarizing channel that is 0.89 and 0.95 respectively.When the transmission distance is 2km,the fidelity of the entangled particle pair is 0.8,the quantum channel establishing rate is 7.40 Hz and 15.57 Hz respectively.Therefore,when the quantum satellite signs are appearing agreater attenuation,in order to improve the reliability of thequantum satellite communication,the parameters should be adjusted adaptively in light of the ratio of ice and water in the ice-water mixed clouds.

关 键 词：量子卫星通信 冰-水混合云 谱分布函数 比特翻转信道 退极化信道 

分 类 号：O413.1[理学—理论物理] P426.51[理学—物理]