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Global Satellite Quantum Key Distribution via Molniya-Orbit Relays

A strategy for global-scale quantum key distribution that overcomes fiber-loss distance limits by relaying keys through satellites, with quantum relay satellites placed in highly eccentric Molniya orbits so that each lingers over a targeted hemisphere, maximizing line-of-sight link availability and coverage while reducing key-exchange latency, together with a framework for configuring the constellation.

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2501.00280

This paper proposes a scheme for extending quantum key distribution to global range using satellites. Because photons cannot be copied or amplified without destroying their quantum state (the no-clon…