基于湍流球泡折射的空间量子密钥分发性能分析

发布时间：2018-01-22 11:32

  本文关键词： 自由空间量子密钥分发 湍流球泡模型 偏振态 误码率 诱骗态　出处：《光子学报》2017年07期 　论文类型：期刊论文

【摘要】：为了研究大气湍流对自由空间量子密钥分发的性能影响,将大气湍流建模为空间中随机分布的空气球泡,利用几何光学原理分析单光子在湍流球泡中的传播,定量计算了经过两次折射后由于偏振态变化造成的光子透射率比值k和误码率Ep的起伏,利用蒙特卡洛方法模拟了湍流折射率随机变化时二者的趋势;最后推导了经过湍流折射后的诱骗态空间量子密钥分发成码率公式并通过分析误码来源得到满足成码率需要的k值上限,建立偏振误码率与入射角和湍流折射率的关系并得到Ep的安全阈值.仿真结果表明当入射角在44.8°~76.5°,湍流折射率在1~1.33范围内可以满足误码率的上限约束.该研究为湍流条件下进行空间量子通信实验提供了理论参考.
[Abstract]:In order to study the effect of atmospheric turbulence on the performance of quantum key distribution in free space, atmospheric turbulence is modeled as a randomly distributed air bubble in space. The propagation of single photon in a turbulent sphere is analyzed by geometric optics principle. The fluctuation of the photonic transmittance ratio k and the bit error rate EP caused by the change of polarization state after twice refraction are calculated quantitatively. The Monte Carlo method is used to simulate the trend of the turbulent refractive index changing randomly. Finally, the formula of quantum key distribution in decoy state space after turbulent refraction is derived, and the upper limit of k value is obtained by analyzing the source of error code. The relationship between polarization bit error rate (PER) and incident angle and turbulent refractive index is established and the safe threshold of EP is obtained. The simulation results show that the incident angle is 44.8 掳/ 76.5 掳. The refractive index of turbulence can satisfy the upper bound of bit error rate in the range of 1 ~ 1.33. This study provides a theoretical reference for the experiment of quantum communication in space under turbulent conditions.
【作者单位】： 空军工程大学信息与导航学院;空军大连通信士官学校;
【基金】：国家自然科学基金(No.61168068)资助~~
【分类号】：O413;TN918.4
【正文快照】： (2空军大连通信士官学校,辽宁大连116600)1-50010700引言航空通信的可靠性和安全性一直以来是人们研究的重点,自由空间量子密钥分发可以实现随机密钥在地空双方之间绝对安全地共享,被认为是构建安全航空通信链路和全球保密通信网络的重要手段,自提出以来逐渐发展为量子通信领，

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