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Theoretical analysis of single-photon acquisition in satellite-to-ground quantum key distribution

Liying Tan

Published Jan 1, 2006• 0 citations

Abstract

The expressions of single-photon acquisition probability are deduced from TEM10 mode Laguerre-Gaussian beams. Single-photon acquisition is analyzed for the links between a ground station and a satellite in a low earth orbit. The results show that single-photon can be acquired by the receiver on the satellite at the maximum probability if highly attenuated laser pulses based on TEM10 mode Laguerre-Gaussian beams are used as single-photon sources and a bright precursor reference pulse can be used to set a short time window. Single-photon acquisition probability is normal on the order of 10-1~10-3. In comparison with the fundamental-mode Gaussian beam, the TEM10 mode Laguerre- Gaussian beams have an advantage because the losses of single-photon acquisition probability can not be caused by the satellite movement. Atmospheric turbulence is considered and the expressions of single- photon acquisition probability are modified.

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