Quantum cryptography conquers noise problem - Nature

It’s hard to stand out from the crowd — particularly if you are a single photon in a sea of millions in an optical fibre. 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 quant

[skam666]

“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 90km of noisy optical fibre.”