The research of single photon acquisition probability based on the fundamental-mode Gaussian beam
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National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China;
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College of Applied Sciences, Harbin University of Science and Technology, Harbin 150080, China
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Corresponding author:
MA Jing, majing@hit.edu.cn
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Received Date:
2004-06-27
Accepted Date:
2004-08-09
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Abstract
Theoretical model of single photon acquisition probability is established for free-space quantum key distribution.The expression of single photon acquisition probability is deduced from the fundamental-mode Gaussian beam.The parameters that influence the single photon acquisition probability are the transmitter's tracking-pointing error,the far-field divergence angle,the link distance between transmitter and receiver and the receiver's antenna aperture.The single photon acquisition probability is analyzed in numerical simulation for the link between a ground station and a satellite in a low earth orbit and it is normally on the order of 10-3~10-5.
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