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We investigate the polarization state dynamics of single photon pulse foroptical fiber quantum communication channels. On the basis of a birefringencevector model in which amplitude and direction are both stochastic variables,Jones vector is obtained by solving the frequency domain wave equation. Thefidelity of output quantum state and degree of polarization of the pulse arealso obtained from the density operators. It is shown that the fidelity ofquantum state decreases quickly and tends to a stable value along opticalfiber, and increases for larger mean fluctuation magnitude of the stochasticfiber birefringence. Degree of polarization is nearly constant for small meanfluctuation magnitude of the birefringence. The fidelity and degree ofpolarization vary in the same way for Gaussian and rectangular frequencyspectrum envelope, while the value of Lorentzian spectrum is smaller.

Polarization State Dynamics of Single Photon Pulse Under Stochastic Polarization Mode Dispersion for Optical Fiber Quantum Channels