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大气导致的脉冲展宽对星载量子密钥分发的影响

Effect of the Pulse Broadening Caused by Atmosphere on Satellite Based Quantum Key Distribution

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摘要

分析比较了星地量子密钥分发系统中由于大气湍流和大气色散导致的脉冲展宽。分别推导了大气湍流和色散效应下脉冲展宽比。根据大气压强和温度与海拔间的实测数据,计算了到达脉宽与不同初始脉宽、工作波长、链路天顶角的关系。并根据到达脉宽计算了系统背景噪声量。数值模拟结果表明:当工作波长为1.06 μm,初始脉宽为15 fs时,到达脉宽有最小值。对于不同的链路天顶角,在无月晴朗的星空,探测器探测到的背景噪声约为1.9×10-10~2.7×10-10,而误码率约为0.5×10-5。

Abstract

The temporal pulse broadening of cohered laser pulse caused by atmospheric turbulent and dispersion is analyzed. The expression of turbulence-induced and dispersion-induced pulse broadening is given. Based on the measured data of atmospheric parameters and the fitting formula, the relations of pulse broadening to the zenith angle, original pulse and the wavelength of optical signal are obtained.The background noise in satellite-earth quantum key distribution is simulated. The simulation shows that when the wavelength is 1.06 μm and the original pulse is 15 fs, the final pulse has the minimum. For different zenith angle, the background noise is about 1.9×10-10~2.7×10-10, and the quantum error bit rate is about 0.5×10-5.

广告组4 - 量子光学(超导单光子,符合计数器)
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中图分类号:O431.2

DOI:10.3788/aos201232.1127001

所属栏目:量子光学

责任编辑:李文喆  信息反馈

收稿日期:2012-03-20

修改稿日期:2012-06-20

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作者单位    点击查看

赵顾颢:空军工程大学电讯工程学院, 陕西 西安 710077
赵尚弘:空军工程大学电讯工程学院, 陕西 西安 710077
幺周石:中国空间技术研究院西安分院, 陕西 西安 710000
蒙文:空军工程大学电讯工程学院, 陕西 西安 710077
王翔:空军工程大学电讯工程学院, 陕西 西安 710077
朱子行:空军工程大学电讯工程学院, 陕西 西安 710077
刘丰:中国空间技术研究院西安分院, 陕西 西安 710000

联系人作者:赵顾颢(zghlupin@163.com)

备注:赵顾颢(1986—),男,博士研究生,主要从事量子密钥技术和卫星光通信等方面的研究。

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