Study On The Performance Of Quantum Communication In The Atmosphere And The Ocean Environment

Quantum communication technology is mainly based on the basic theory of quantum mechanics.It makes full use of quantum coherence to explore the possibility of computing,encoding and transmission of information in a new way.It provides new ideas,new concepts and new ways to break through the limitations of classical communication and has the advantages of absolute confidentiality,fast speed,communication capacity.It is expected to solve the information security problems faced by everyone in the information age and it is one of the research hotspot in the present era.With the successful launch of the first global quantum communication satellite "Mo-tse",which is developed by our country and the important experiments of the high speed quantum key distribution and the wide area quantum communication network,our country has made a step towards the goal of building the global security communication network.Based on the theory of quantum communication,combined with the attenuation model of various interference factors in the atmosphere and ocean on quantum signal transmission,the influence of various interference factors on the performance of quantum communication is studied in detail,and the relationship between the influence factors and the channel parameters under different environment background is proposed,which provides a reference for the quantum communication,in order to increase the reliability of quantum communication.Firstly,the influence of different mixing ways of haze particle and water cloud particle on the communication performance of the quantum satellite is studied under the haze weather conditions.According to the spectral distribution function of haze particle and water cloud particle and the extinction coefficients under different mixing ways,the relationship between particle size ratio of mixed particles under different mixing ways and channel attenuation of the quantum satellite communication are proposed.For the amplitude damping channel,the influence of the mixture particle size ratio under different mixing ways on the channel capacity,the channel error rate and the channel average fidelity is analyzed and established.Then,according to the absorption and scattering model of three elements of water color in the sea water,the relationship between the chlorophyll concentration,the wavelength of the light quantum signal and the attenuation of underwater quantum link is analyzed.And then,for the depolarization channel,the influence of chlorophyll concentration and wavelength of the light quantum signal on channel capacity,channel average fidelity and channel error rate is analyzed.Finally,the influence of sea wave in the atmospheric-sea interface on the performance of satellite to submarine quantum communication is analyzed.According to the spectrum distribution function of sea wave and the simulation of the wave by linear superposition method,the relationship between the sea surface wind speed,the wavelength of sea water and the channel entanglement degree,the channel utilization rate of satellite to submarine quantum communication is proposed,and the performance simulation is carried out.At the same time,the research contents of this paper are summarized,and the future development of quantum communication is prospected.