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Quantum Communications Finds Many Paths to Commercialization

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Marie Freebody, Contributing Editor, [email protected]

From quantum repeaters and single-photon detectors to space satellites, photonics promises to bring quantum encryption to the mainstream. Quantum communications has already been proved possible over short distances. Via fiber optics, quantum key distribution (QKD) has been demonstrated over 250 km; for free-space transmission, the longest demonstrated distance has been more than 144 km. The problem is that experts don’t expect these distances to extend to more than a few hundred kilometers with current technologies. Essentially, the technology can go only so far before...Read full article

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