Polarization compensation implementation method for use in quantum key distribution

The invention discloses a polarization compensation implementation method for use in quantum key distribution. The power value of polarized light detected by a polarization detector is detected in real time, and is fed back to a control unit. A control unit is used for controlling a motor to drive a wave plate to rotate by calculating the required rotation angle value of the wave plate in order to realize automatic control. The method is easy to operate and high in efficiency, and polarization compensation can be performed in real time. The calculation of the required rotation angle value of the wave plate is independent of the detection efficiency of the polarization detector and a parameter value provided by the wave plate, so that the method has very high self-adaptive capability in a complex control environment. The performance of next correction is determined by calculating a polarization compensation performance index after every correction. The polarization compensation performance index can reach an ideal value through repeated correction, so that high correction accuracy is achieved.