随机偏振模色散下Optical Fiber量子信道单光子脉冲偏振态动力学
Polarization State Dynamics of Single Photon Pulse Under Stochastic Polarization Mode Dispersion for Optical Fiber Quantum Channels
摘要：
研究了光纤量子通信信道中单光子脉冲的偏振态动力学。在双折射矢量模型的基础上，通过求解频域波动方程，得到了双折射的琼斯矢量。利用密度算符计算了输出量子态的保真度和脉冲的偏振度。结果表明，量子态的保真度沿光纤方向迅速下降并趋于稳定值，随随机光纤双折射的平均涨落幅度增大而增大。当双折射的平均波动幅度很小时，偏振度几乎不变。对于高斯和矩形频谱包络，保真度和偏振度的变化规律相同，而洛伦兹频谱的值较小。
英文摘要：
We investigate the polarization state dynamics of single photon pulse for optical fiber quantum communication channels. On the basis of a birefringence vector model in which amplitude and direction are both stochastic variables, Jones vector is obtained by solving the frequency domain wave equation. The fidelity of output quantum state and degree of polarization of the pulse are also obtained from the density operators. It is shown that the fidelity of quantum state decreases quickly and tends to a stable value along optical fiber, and increases for larger mean fluctuation magnitude of the stochastic fiber birefringence. Degree of polarization is nearly constant for small mean fluctuation magnitude of the birefringence. The fidelity and degree of polarization vary in the same way for Gaussian and rectangular frequency spectrum envelope, while the value of Lorentzian spectrum is smaller.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
