PHASE MODULATION-BASED QKD POLARIZATION STATE PREPARATION APPARATUS AND METHOD

摘要

The present application provides a phase modulation-based QKD polarization state preparation apparatus and method. The apparatus comprises an interferometer having equal arms, thereby avoiding the problem of upper limit of the system frequency, and the phase modulation-based QKD polarization state preparation apparatus has the characteristics of high speed. A photoelectric detection module and a phase adjustment module are additionally provided at the Alice's side, the photoelectric detection module detects an interference signal of the interferometer and sends it to the phase adjustment module, and the phase adjustment module adjusts the phase of the interferometer according to the interference signal to modulate the QKD polarization state; thus, the phase for preparation of the QKD polarization state is compensated for and fed back in real time, thereby reducing or even eliminating the phase deviation and drift during preparation of the QKD polarization state.