Acta Photonica Sinica, Volume. 46, Issue 1, 101001(2017)
Study on Single-photon Acquisition Probability Based on Laguerre-Gaussian Beams
Highly attenuated laser pulses based on Gaussian beams are used as single-photon sources. It is assumed that this laser beam has an initial Gaussian temporal pulse shape and a TEM01 mode Laguerre-Gaussian spatial profile. Based on the Rytov approximation and the modified von Karman spectrum model of refractive-index fluctuations, the influence of atmospheric turbulence on a single-photon acquisition probability in satellite-ground quantum communications was studied. Theoretical models of the single-photon acquisition probability in an uplink channel and a downlink channel were established. The single-photon acquisition probability was analyzed for laser links between a ground station and a satellite in a low earth orbit. The results show that, the single-photon acquisition probability in the uplink channel depends strongly on the refractive-index structure parameter at the ground C2n(0) and decreases as C2n(0) increasing. However, in the downlink channel the single-photon acquisition probability does not depend on C2n(0), that is, atmospheric turbulence has little influence on it.
Get Citation
Copy Citation Text
ZHANG Guang-yu, LIU Lin-jing, ZHANG Cheng-long. Study on Single-photon Acquisition Probability Based on Laguerre-Gaussian Beams[J]. Acta Photonica Sinica, 2017, 46(1): 101001
Received: Sep. 2, 2016
Accepted: --
Published Online: Feb. 9, 2017
The Author Email: Guang-yu ZHANG (guangyuzhang@163.com)