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, and the latest example of that is a new study calculating the feasibility of sending quantum signals from Earth to a satellite – with the potential to enable larger, more powerful quantum communication networks.
, but the idea of being able to transfer photons in the other direction – from Earth up to space – had been considered impossible, due to difficulties keeping the signal stable. This latest study, from a team at the University of Technology Sydney in Australia, suggests it could be done. It's based on a detailed model that deploys"The idea is to fire two single particles of light from separate ground stations to a satellite orbiting 500 kilometers above Earth, traveling at about 20,000 kilometers per hour, so that they meet so perfectly as to undergo quantum interference, "Surprisingly, our modeling showed that an uplink is feasible. We included real-world effects such as background light from the Earth and sunlight reflections fromThe team modeled a possible uplink setup consisting of two ground stations sending entangled photons to space. Detecting them would require their near-simultaneous arrival at the satellite. , it could only function at night, away from the interference of sunlight – and even then only with careful calibration. But it's something to build on., but now we know that two-way systems are at least theoretically possible. Future real-world tests could be carried out using receivers on drones or balloons, the researchers suggest. "It's generated and transmitted in a way that is often invisible to the user – we just plug in our appliances and use it."
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