Регистрация однофотонного сигнала от низколетящих спутников для целей спутникового квантового распределения ключей

A ground-based receiving station for quantum key distribution with a satellite, capable of analyzing the quantum polarization states of photons, is demonstrated. In the experiment on tracking a low-Earth orbit satellite, the residual tracking error by the ground station does not exceed 10 μrad, which ensures stable reception of the optical signal in four channels of the polarization state decoder. An estimation of the efficiency of registration of an optical signal in the mode of tracking satellites is carried out.