应用光学, 2008, 29 (2): 0303, 网络出版: 2010-06-13   

基于拉盖尔-高斯光束的单光子捕获理论研究

Theoretical study of single-photon acquisiti on based on Laguerre-Gaussian beams
作者单位
哈尔滨工业大学 可调谐激光技术国家级重点实验室,黑龙江 哈尔滨 150001
摘要
基于TEM10模拉盖尔-高斯光束,推导自由空间量子密钥分配中单光子捕获概率表达式。针对低轨卫星-地面站间激光链路进行单光子捕获分析。结果表明:采用可高度衰减激光脉冲的TEM10模拉盖尔-高斯光束作为单光子源,单光子捕获采用前驱波参考脉冲设置时间窗口的方法,可使卫星上接收机以最大概率捕获光子。与基模高斯光束相比,采用TEM10模拉盖尔-高斯光束的优点是,不会由于卫星运动而增加单光子捕获概率的损耗。
Abstract
The expressions of single-photon acquisition probability in free-space quantum key distribution were deduced based on TEM10 mode Laguerre-Gaussian beams. The single-photon acquisition was analyzed for the laser link between a ground station and a satellite in a low earth orbit. The results show that single-photon can be acquired by the receiver in the satellite with 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 is used to set a short time window for the single-photon acquisition. Unlike the fundamental-mode Gaussian beam,the TEM10 mode Laguerre-Gaussian beam does not cause the single-photon acquisition probability losses due to the movement of satellites.

于思源, 刘剑峰, 张光宇, 马晶, 谭立英. 基于拉盖尔-高斯光束的单光子捕获理论研究[J]. 应用光学, 2008, 29(2): 0303. YU Si-yuan, LIU Jian-feng, ZHANG Guang-yu, MA Jing, TAN Li-ying. Theoretical study of single-photon acquisiti on based on Laguerre-Gaussian beams[J]. Journal of Applied Optics, 2008, 29(2): 0303.

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