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Nature 421, 224-225 (16 January 2003) | doi:10.1038/421224a
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Quantum cryptography: Code-breakers confounded
Mark Hillery
Abstract
Coherent-state quantum cryptography holds the promise of efficient, secure communication. An experimental demonstration shows that a secure key to the code can be exchanged, even if there is a large transmission loss.
Quantum cryptography makes use of the unusual properties of quantum mechanics to protect encoded information. In trying to listen in on a message sent through a properly designed quantum communication channel, an eavesdropper will inevitably disturb the signal and thereby reveal his or her presence.
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