A step toward practical quantum encryption over free-space networks

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Researchers have sent a quantum-secured message containing more than one bit of information per photon through the air above a city. The demonstration showed that it could one day be practical to use high-capacity, free-space quantum communication to create a highly secure link between ground-based networks and satellites, a requirement for creating a global quantum encryption network. Quantum encryption uses photons to encode information in the form of quantum bits. In its simplest form, known … More
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