空间尘埃等离子体对量子卫星通信性能的影响

为了研究尘埃等离子体中带电尘埃的粒子半径、粒子浓度和带电荷数对量子通信性能的影响,首先根据Mie散射理论得到单个带电尘埃粒子的光散射截面;然后通过粒子浓度求出总的消光截面,得出链路衰减的数学模型,提出了带电粒子特性与量子纠缠度的关系;针对退极化信道,当单个尘埃粒子所吸附带电粒子的个数为50时,给出了尘埃粒子半径、粒子浓度与信道容量和量子误码率的定量关系.仿真结果表明,当量子信号的传输距离为10km时,尘埃粒子浓度从1×10~(10) m~(-3)增加到10×10~(10) m~(-3),信道容量从0.6726降低到0.1075;尘埃粒子半径从0.1μm增加到10μm时,量子误码率由1.334×10~(-3)增加到5.309×10~(-3).由此可见,尘埃等离子体中带电尘埃粒子的半径和浓度对量子卫星通信性能有显著的影响.因此,为确保量子通信的可靠性,应根据所探测到的等离子体环境的状况,调整卫星通信系统的各项指标参数.

Influence of Space Dusty Plasmas on the Performance of Quantum Satellite Communication

In order to study the effect of particle radius、particle concentration and charge number of charged dust in dusty plasmas on the performance of quantum communication,according to the Mie scattering theory,the light scattering cross section of single charged dust particle was obtained.Based on particle concentration,the extinction cross section of particles was calculated,the mathematical model of the link attenuation was established,and the relationship between the characteristics of charged particles and quantum entanglement was proposed.Aimed at the depolarization channel,when the number of charged particles adsorbed by a dust particle is 50,the quantitative relation among the dust particle radius and the particle concentration,the channel capacity and the quantum bit error rate was given.The simulation results show that when the transmission distance of quantum signal is 10km,particle concentration increases from 1× 1010 m-3 to 10 × 1010 m-3,the channel capacity decreases from 0.672 6 to 0.107 5;the dust particle radius increases from 0.1 μm to 10μm,the quantum bit error rate increases from 1.334 × 10-3 to 5.309 × 10-3.It can be seen that the radius and concentration of charged dust particles in the plasmas have a significant influence on the performance of free space quantum communication.Therefore,in order to ensure the reliability of quantum communication,the various parameters of the communication system should be adjusted according to the conditions of the detected plasmas environment.