According to BBC, unbreakable encryption has been unvieled in Vienna where a network consisting of six locations across Vienna and in the nearby town of St Poelten, using 200 km of standard commercial fibre optic cables has been setup.
Quantum systems use the laws of quantum theory, which have been shown to be inherently unbreakable. "All quantum security schemes are based on the Heisenberg Uncertainty Principle, on the fact that you cannot measure quantum information without disturbing it," Gilles Brassard of Montreal University explained. "Because of that, one can have a communications channel between two users on which it's impossible to eavesdrop without creating a disturbance. An eavesdropper would create a mark on it. That was the key idea."
Albert Einstein, who discovered the quantum properties of photons of light - indeed, discovered the very concept of the photon - always resisted quantum theory's spooky behaviour, "God does not play dice", being among his oft-quoted objections. But experiments eventually proved that he apparently does, and also laid the technical foundations for today's quantum information revolution - cryptography, teleportation, and computation.
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