Quantum Cryptography Conquers Noise Problem

It’s hard to stand out from the crowd -- particularly if you are a single photon in a sea of millions in an optical fiber. Because of that, ultra-secure quantum-encryption systems that encode signals into a series of single photons have so far been unable to piggyback on existing telecommunications lines. But now, physicists using a technique for detecting dim light signals have transmitted a quantum key along 90 kilometers of noisy optical fiber . The feat could see quantum cryptography finally enter the mainstream. [More]

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