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Quantum Cryptography Stretches 100 Kilometres
Quantum cryptography guarantees secure communications by harnessing the quantum quirks of photons sent between users. Any attempt to intercept the photons will disturb their quantum state and, because this quantum quality is an integral part of key generation, the disturbance with immediately raise the alarm.
But reducing the amount of random noise picked up by a detector at either end of a fibre link is crucial. If the noise level is too high, the key generation process will fail too many times to be practical. Until now, no device has been able to make it work across such a long optical link.
The link for this article located at NewScientist is no longer available.