Based on the popular encryption technology in the BB84, E91, B92 quantum protocol for a brief introduction, and simulation analysis that 500 randomly generated keys mean and variance and use these points for software distribution Mapping. Fully proved the feasibility of the dresses 1std above agreement, and finally the expected results. According to the probability annotation of quantum mechanics, the theoretical model of the single-photon acquisition probability is analyzed and perfected based on Maxwell equation. Based on the TEM01 Laguerre-Gausssian beams and TEM20 Hermite-Gaussian beams, The theoretical model of single-photon acquisition is analyzed. The single-photon cheap nike shoes acquisition is analyzed for the laser links between a ground station and a satellite in a low earth orbit. To acquire the single-photon, a bright precursor reference pulse which online shoes store carries no wedding dresses 2nd key information can be used to set a short time window within which to look for the single-photon. The single-photon can be acquired by the receiver at the maximum probability when the Hermite-Gaussian beams and the Laguerre-Gaussian beams are used. The single-photon capture probabilities are in general order of hot women's dresses magnitude at 10-2～10-4 of two Gaussian beams. Based on the BB84 protocol, set up low-orbit shop 4u blog for shirtssatellite-ground station between the quantum communication system model. Through the capture of single-photon probability, quantum bit-rate and quantum bit error rate's numerically calculating and analyzing. we can know that the communication is feasible between the low-orbit satellites and ground stations.The research work in this paper is the key technology for the realization of satellite quantum communication, provides a theoretical and experimental foundation for the actual satellite quantum communication system design.
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