Research On Anti-Interference Of Quantum Encryption Satellite Communication Satellite-Ground Link

Quantum private communication,an interdisciplinary combination of the basic principles of quantum mechanics and information communication theory,has the advantages of quantum mechanics and information communication disciplines and has many advantages that classical communication cannot match.Because of the unique advantages of communication security,in recent years,the research progress of quantum private communication being broken continuously has triggered a new wave of technology in the field of communication and information technology.As an important part of quantum communication,quantum satellite communication has also developed healthy through the unremitting efforts of research teams from various countries,which has laid a solid foundation for the construction of a wide-area quantum satellite communication network.However,during quantum satellite communications performing,interfered by rainfall,snowfall,and atmospheric smoke,fog,dust and other particles,the quantum state will intensify attenuation of the quantum state.Those problems have brought severe challenges to the development of quantum satellite communications.Based on the core foundation of the basic theory of quantum private communication and based on the impact of particulate matter in the atmospheric environment on the performance of quantum satellite communications,this paper proposes a quantum entanglement feedback system model and a software-defined quantum secure communication system model,which has certain reference value for the further development of quantum satellite communications.The innovations of this paper are mainly reflected in:Firstly,according to the principle of Mie scattering,the extinction coefficient of smoke,fog,dust and other particulate matter in the atmosphere is obtained;the mathematical model of the concentration of particulate matter in the atmosphere,the optical quantum entanglement on the transmission distance and the quantum satellite link attenuation is established;The relationship of the natural environment visibility and quantum entanglement is proposed;the relationship between particle concentration,quantum signal transmission distance,bit error rate,and channel capacity is given,and simulations are performed.The results show that when performing quantum satellite communications,particulate matter in the atmosphere will cause the attenuation of the quantum satellite link,and will increase in the bit error rate of the quantum communication system,and will lead to decline in the quality of quantum satellite communications.Secondly,an optimization strategy based on quantum entanglement feedback control is proposed.The strategy is to measure the leaked photons in the optical cavity,use the information obtained by the measurement to estimate the state of the atom,and then adjust the controller to change the spin of the atom in the cavity.Then the relationship between different quantum noise channels and fidelity is established,and the security key generation rate of the system is analyzed.The simulation results show that in the amplitude damping channel,depolarization channel and phase damping channel,using this strategy,the fidelity of the quantum satellite communication system is significantly improved,and the security key generation rate of the system is effectively improved,and anti-jamming capability of quantum satellite communication satellite-ground link is enhanced.Thirdly,combining the design idea of software-defined network,a software-defined quantum private communication system model is proposed.The system monitors the free space quantum channel environment in real time,and feeds back the monitored information to the control layer.The control layer adjusts the parameters of the quantum communication system through data analysis to ensure that the performance parameters of quantum communication reach the best state.The simulation results show that the software-defined quantum private communication system can improve the entanglement and fidelity of quantum communication,reduce the error rate of quantum states,ensure the quality of quantum satellite communication,and improve the anti-interference ability of the system.