Quantum satellites are best known for sending entangled particles of light from orbit down to ground stations, a method used to create extremely secure communication links. New research now shows that the process can also work in reverse, with quantum signals sent from Earth up to a satellite, an approach long considered impractical.
This finding removes several major limitations facing today's quantum satellite systems. Equipment on the ground can draw on far more power, is simpler to service, and can produce much stronger signals. These advantages could be critical for building future networks that link quantum computers through satellites acting as relays.
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