Encoded Photons Using Quantum Cryptography Sent a Record Distance


Quantum encryption systems, which encode signals into a series of single photons, have had trouble sending them along optical fibers. Until now, it has been unfeasible to piggyback these photons onto existing telecommunications lines. Now using a technique for detecting dim light signals, physicists have enabled the transmission of a quantum key along 90 km of noisy optical fiber.

Read more @ SciTechDaily

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