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Satellite-based quantum communication is an invaluable resource for therealization of a quantum network at the global scale. In this regard, the useof satellites well beyond the low Earth orbits gives the advantage of longcommunication time with a ground station. However, high-orbit satellites pose agreat technological challenge due to the high diffraction losses of the opticalchannel, and the experimental investigation of such quantum channels is stilllacking. Here, we report on the first experimental exchange of single photonsfrom Global Navigation Satellite System at a slant distance of 20000kilometers, by exploiting the retroreflector array mounted on GLONASSsatellites. We also observed the predicted temporal spread of the reflectedpulses due to the geometrical shape of array. Finally, we estimated therequirements needed for an active source on a satellite, aiming towards quantumcommunication from GNSS with state-of-the-art technology.

Towards Quantum Communication from Global Navigation Satellite System