Research On The Characteristics Of Quantum Channels In Atmospheric Aerosol And Marine Environment

Based on the theory of quantum mechanics,quantum communication technology has the advantages of high confidentiality,fast transmission speed,and strong concealment.It is currently a research hotspot in the field of information science and communication technology.However,when optical quantum signals are transmitted in the atmosphere and the ocean,they will be interfered by various environmental factors,resulting in reduced communication quality.Therefore,three influence factors,black carbon aerosol,black carbon and non-absorbent mixed aerosol,and sea ice,are selected to analyze the relationship between different environmental noise factors and quantum communication channel performance parameters,based on the extinction characteristics,by establishing a quantum signal attenuation model under the influence of various environmental factors,and studying the external environmental impact on quantum communication in a specific environment,provide theoretical reference for further promoting the research of quantum communication in the atmosphere and ocean.The main research contents and innovations are as follows:1.In order to study the influence of black carbon aerosol on the performance of quantum communication channel,based on the black carbon aerosol particle equivalent model and Michaelis scattering theory,the quantitative relationship between the black carbon aerosol particle number concentration and link attenuation,bit error rate is established;For amplitude damped channels and depolarized channels,the relationships between the concentration of black carbon aerosol particles and channel capacity,channel survival function were analyzed and numerical simulations were performed.The simulation results show that with the increase of black carbon aerosol particle concentration,the link attenuation and bit error rate increase exponentially,while the channel capacity and channel survival function decrease in varying degrees,and the attenuation of amplitude damping channel performance parameters is more severe.2.In order to study the influence of black carbon and non-absorbable mixed aerosol on the performance of quantum communication channel,according to the extinction coefficient of black carbon and non-absorbable aerosol in the Core-shell and Maxwell-Garnett internal mixing models,combined with the particle equivalent radius,the effects of mixed aerosol particles in different mixing modes on the link attenuation,the fidelity of channel teleportation and the quantum security key generation rate were compared and analyzed,and numerical simulation was carried out.The simulation results show that in the two mixed states,with the increase of the equivalent radius of aerosol particles,the link attenuation is gradually increasing,while the quantum security key generation rate and the channel teleportation fidelity decrease with the increase of the equivalent radius,and the impact of mixed aerosol particles in the Maxwell Garnett model on quantum channel performance is more significant.3.In order to study the influence of sea ice on the performance of underwater quantum communication channel,the data models of sea ice density,salinity and extinction coefficient are established according to the absorption and scattering characteristics of sea ice components,and the relationship between sea ice parameters and link attenuation and channel utilization is studied;For underwater quantum key distribution system,the influence of sea ice on channel error rate and bit formation rate is analyzed and numerical simulation is carried out.The simulation results show that with the increase of sea ice density and salinity,the link attenuation and bit error rate will also increase,and the channel utilization rate and the underwater quantum key distribution system coding rate will gradually decrease,and the increase in sea ice salinity has a more significant impact on the performance of quantum channels.