Research On Quantum Channel Properties In Different Particle And Ocean Environments

Quantum satellite communication technology,as the most promising secure and confidential communication technology,has been widely concerned.Quantum communication transmits information based on quantum state superposition and quantum entanglement in quantum mechanics.It is an interdisciplinary subject combining quantum mechanics and communication theory,and it is a new communication mode facing the future.Quantum communication carries information through photons and other elementary particles,which has the advantages of high efficiency,absolute secrecy and large communication capacity,and is of great significance to the transmission of national information and military information in China.However,when quantum optical signals are transmitted in free space and underwater,the transmission performance will inevitably be affected by environmental factors.Therefore,by establishing the attenuation model of noise factors of various environmental factors,the relationship between environmental noise factors and performance parameters of quantum communication in different channel environments such as amplitude damping channel and depolarization channel is discussed,which provides a theoretical reference for future research on quantum communication in different environments.This article does the following work:1.In order to study the influence of soot condensed particles on the communication performance of quantum satellites,the extinction characteristics of particles are analyzed according to the equivalent model of soot condensed particles,and the relationships between transmission distance,particle number concentration and link attenuation,amplitude damping channel capacity,entanglement fidelity and channel bit error rate are established by combining with the conversion formula of particle mass concentration.The effects of different particle number concentration on channel parameters such as link attenuation and channel capacity are analyzed by simulation.2.According to the relationship between ocean turbulence parameters and light wave structure function,the relationship between ocean turbulence intensity and ocean turbulence parameters is obtained.The relationship between ocean turbulence parameters and channel entanglement,bit flipping channel capacity and channel bit error rate is established and simulated.The influence of Ocean Turbulence on channel entanglement,channel capacity and channel bit error rate is analyzed.3.In order to study the influence of marine mineral particles on the performance of underwater quantum communication channel,the relationship model of marine mineral particle group density,transmission distance and link attenuation is established and simulated.For depolarized channel,the relationship between mineral particle density,transmission distance,channel capacity and channel bit error rate is established and simulated.