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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

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【作者】 于思源刘剑峰张光宇马晶谭立英

【Author】 YU Si-yuan,LIU Jian-feng,ZHANG Guang-yu,MA Jing,TAN Li-ying(National Key Laboratory of Tunable Laser Technology,Harbin Institute of Technology,Harbin 150001,China)

【机构】 哈尔滨工业大学可调谐激光技术国家级重点实验室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.

  • 【文献出处】 应用光学 ,Journal of Applied Optics , 编辑部邮箱 ,2008年02期
  • 【分类号】TN918
  • 【被引频次】3
  • 【下载频次】274
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