【摘 要】
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In order to study the relationship between the non-spherical atmospheric charged particles and satellite-ground quantum links attenuation.The relationship among the particle concentration,equivalent radius,charge density of the charged particle,the attenu
【机 构】
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School of Communication and Information Engineering, Xi’an University of Posts and Telecommunication
论文部分内容阅读
In order to study the relationship between the non-spherical atmospheric charged particles and satellite-ground quantum links attenuation.The relationship among the particle concentration,equivalent radius,charge density of the charged particle,the attenuation coefficient and entanglement of the satellite-ground quantum link can be established first according to the extinction cross section and spectral distribution function of the non-spherical atmospheric charged particles.The quantitative relationship between atmospheric visibility and communication fidelity of satellite-ground quantum link were analyzed then.Simulation results show that the ellipsoid,Chebyshev atmospheric charged particle influences on attenuation of the satellite-ground quantum link increase progressively.When the equivalent particle radius is 0.2 μm and the particle concentration is 50 μg/m3,the attenuation coefficient and entanglement of the satellite-ground quantum link is 9.21 dB/km,11.46 dB/km and 0.453,0.421 respectively;When the atmospheric visibility reduces from 8 km to 2 km,the communication fidelity of satellite-ground quantum link decreases from 0.52 to 0.08.It is shown that the non-spherical atmospheric charged particles and atmospheric visibility influence greatly on the performance of the satellite-ground quantum link communication system.Therefore,it is necessary to adjust the parameters of the quantum-satellite communication system according to the visibility values of the atmosphere and the shapes of the charged particles in the atmosphere to improve reliability of the satellite-ground quantum link.
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