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This paper proposes the design of a global-scale free-space optics/quantum key distribution (FSO/QKD) network based on a geosynchronous (GEO) satellite as the secret key source and low-Earth orbit (LEO) satellites as relay nodes for multiple legitimate users on the ground. The continuous variable QKD (CV-QKD) protocol with dual-threshold/direct det...
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... are seven orbital planes of the Starlink satellite constellation from northwest to southwest of Japan, as shown in Fig. 7. Each plane composes of a group of LEO satellites that fly across Japan alternately. For the sake of clarity, each group is numbered by the orbital plane order at the time of observation. To realize the proposed system, it is required that there exist two LEO satellites that are simultaneously within the required elevation angle with ...
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