Researchers demonstrated a quantum encryption system at a conference in Vienna. The system uses photons to encode data and relies on the Heisenberg Uncertainty Principle, which says that quantum information cannot be measured without disturbing it. As soon as the photons are observed by an eavesdropper they are scrambled, leaving the encryption unbroken and creating a trace of the eavesdropper.
See, "Researchers show off 'unbreakable' quantum encryption," ITPro, October 9, 2008, at http://www.itpro.co.uk/606984/researchers-show-off-unbreakable-quantum-encryption; "The solace of quantum key technology," The Guardian, October 9, 2008, at http://www.guardian.co.uk/technology/2008/oct/09/news.hitechcrime.
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