Quantum Cryptography Weakness?

August 10th, 2008

Yet another twist in th unreality that it quantum physics, in this article we get the first hint that the collapse of the quantum state – is not absolute. Researchers confirmed a hypothesis that you could sort of measure the state of a particle and then stuff it back into the quantum state.
I wonder what this would imply for quantum cryptography. The theory relies upon the fact that you can’t measure the state of a particle without signaling that fact – you can tap the line but people are guaranteed to know. If the measurement distinction is not so black and white, does this theory still hold?

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