Key rate estimation of measurement-device-independent quantum key distribution protocol in satellite-earth and intersatellite links

摘要

In this work, an estimation of the key rate of measurement-device-independent quantum key distribution (MDI-QKD) protocol in free space was performed. The examined free space links included satellite-earth downlink, uplink and intersatellite link. Various attenuation erects were considered such as diffraction, atmosphere, turbulence and the effciency of the detection system. Two cases were tested: asymptotic case with in infinite number of decoy states and one-decoy state case. The estimated key rate showed the possibility of applying MDI-QKD in earth-satellite and intersatellite links, offering longer single link distance to be covered.