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The Micius satellite is the pioneering initiative to demonstrate quantumteleportation, entanglement distribution, quantum key distribution (QKD), andquantum-secured communications experiments at the global scale. In this work,we report on the results of the 600-mm-aperture ground station design which hasenabled the establishment of a quantum-secured link between the Zvenigorod andNanshan ground stations using the Micius satellite. As a result of a quantumcommunications session, an overall sifted key of 2.5 Mbits and a total finalkey length of 310 kbits have been obtained. We present an extension of thesecurity analysis of the realization of satellite-based QKD decoy-stateprotocol by taking into account the effect of the detection-efficiency mismatchfor four detectors. We also simulate the QKD protocol for the satellite passageand by that validate our semi-empirical model for a realistic receiver, whichis in good agreement with the experimental data. Our results pave the way tothe considerations of realistic imperfection of the QKD systems, which areimportant in the context of their practical security.

Eurasian-Scale Experimental Satellite-based Quantum Key Distribution with Detector Efficiency Mismatch Analysis