Research On Quantum Channel Properties In Atmospheric Environment

In view of the changes of quantum communication performance parameters under the influence of atmospheric environment,atmospheric free space was taken as the channel transmission environment,fog,Marine aerosol and cirrus cloud were selected as the impact factors,and particle distribution model of each impact factor was established,and the scattering extinction characteristics of each impact factor were analyzed and calculated.In combination with quantum state changes in quantum communication,the influence of influence factors on the performance of communication is studied to provide theoretical reference for the smooth progress of quantum communication.Firstly,fog day is a common kind of weather,in the thick fog day communication will be more affected.In order to study the influence of fog on quantum communication in free space,the influences of fog visibility and transmission distance on link attenuation,quantum communication channel capacity,channel fidelity and channel error rate are studied according to the spectral distribution function of fog drops and extinction coefficient,and simulation experiments are conducted to analyze the experimental results.During the communication,the parameters of the communication system should be adjusted according to the visibility of the fog to ensure the smooth progress of communication.Secondly,marine aerosol is an important component of atmospheric aerosol,to study the effects of Marine aerosol of quantum communication,according to the spectral distribution of Marine aerosol particles and extinction coefficient,analyzes the Marine aerosol particle concentration,transmission distance and the quantitative relationship between link attenuation,particle concentration,transmission distance and channel capacity is studied,the relationship between the fidelity of the channel and channel bit error rate and simulated experiment,the analysis of experimental results.In the actual quantum communication,various performance parameters should be adjusted according to the concentration of Marine aerosol particles to ensure the normal communication.Thirdly,cirrus clouds of quantum communication optical signal transmission has a great impact,according to the volume qualities cirrus cloud ice particle distribution model,the study of extinction properties of cirrus clouds,and according to the scene shot features,analysis of the roll cloud water content,transmission distance and link extinction characteristics,channel capacity,channel attenuation of concurrence of quantitative relation,hidden under the influence of noise transmission is studied the change of fidelity,and simulated experiment,the analysis of experimental results.In the process of quantum communication,the influence of cirrus cloud should be considered,and parameters of various performance should be adjusted according to the change of cirrus cloud to ensure high-quality communication.