激光与光电子学进展, 2017, 54 (12): 122901, 网络出版: 2017-12-11   

海面泡沫对偏振光子的散射影响 下载: 548次

Effect of Sea Foam on Polarized Photons Scattering
作者单位
海军工程大学电子工程学院, 湖北 武汉 430033
摘要
采用空心分层粒子模型, 并基于Mie散射理论分析了海面泡沫的各项相关参量对光子的偏振散射作用; 对量子误码率和光子偏振保真度公式进行了推导, 运用蒙特卡罗法模拟了光子穿越泡沫层的整个过程。讨论了量子误码率与泡沫散射系数、泡沫吸收系数、泡沫层厚度以及泡沫粒子尺度参数等参量的关系。结果表明:泡沫散射系数和泡沫层厚度的增大都会增加光子的散射次数, 从而加剧光子的退偏程度, 降低光子偏振保真度。当泡沫散射系数超过0.5 cm-1、泡沫层厚度超过6 cm时, 泡沫引起的量子误码率可达6.5%; 泡沫吸收增大了传输损耗, 降低了量子密钥生成率; 在泡沫尺度参数的经典取值范围内, 量子误码率会随着尺度参数的增大而减小。
Abstract
Based on the Mie scattering theory, the scattering effect of related parameters of sea foam on photon polarization scattering is analyzed with the hollow layered particle model. The equations of quantum bit error rate and photon-polarization fidelity are deduced. The whole process of photons passing through a foam layer is simulated with the Monte Carlo method. The relationships among the quantum bit error rate, foam scattering coefficient, foam absorption coefficient, thickness of foam layer and scale parameter of foam particles are discussed. The simulation results show that the increasing of the foam scattering coefficient and the thickness of foam layer may result in the increasing of the scattering times, which strengthens the depolarization degree of photons and reduces the photon-polarization fidelity. When scattering coefficient of foam is over 0.5 cm-1 and the thickness of the foam layer is over 6 cm, the quantum bit error rate caused by the foam reaches to 6.5%. The foam absorption increases the transmission loss and decreases the quantum key generation rate. Within the classical value range of the foam scale parameter, the quantum bit error rate decreases with the increase of the scale parameter.

徐华彬, 周媛媛, 周学军. 海面泡沫对偏振光子的散射影响[J]. 激光与光电子学进展, 2017, 54(12): 122901. Xu Huabin, Zhou Yuanyuan, Zhou Xuejun. Effect of Sea Foam on Polarized Photons Scattering[J]. Laser & Optoelectronics Progress, 2017, 54(12): 122901.

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