It Quantum Cryptology Over? Heisenberg Uncertainity Principle

I don't know much about Quantum Crypto, except that is is a cool idea.  However, does this discovery in Physics make Quantum Crypto outdated?  

http://blogs.forbes.com/alexknapp/2011/03/23/scientists-beat-the-heisenberg-uncertainty-principle/
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TommySzalapskiCommented:
Not at all. They just found a way to measure that causes less error than the earlier ways. So they actually got a better measurement than the Heisenberg Principle says was possible. It admits in the article that uncertainty is still in place.
Quantum Crypto won't really be affected by this at all except that the tests to see if an attacker is trying to break the code might need to be adjusted.
From Wikipedia: http://en.wikipedia.org/wiki/Quantum_cryptography

"In particular, quantum mechanics guarantees that measuring quantum data disturbs that data; this can be used to detect an adversary's interference with a message."
So the adversary could use the method in the article you cite to try to avoid detection, but the measuring still interferes. Perhaps the thresholds just need to be adjusted.
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ozoCommented:
> does this discovery in Physics make Quantum Crypto outdated?  
I do not believe so.
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ozoCommented:
> they actually got a better measurement than the Heisenberg Principle says was possible
I don't think I would characterize it that way either.
They were using entangled particles, not independent particles.
Nor does it appear to affect  tests to see if an attacker is trying to interference with a message.
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TommySzalapskiCommented:
They were using entangled particles, not independent particles
Missed that part. It's still a cool result though.
Nor does it appear to affect  tests to see if an attacker is trying to interference with a message.
Right, but that appears to be the extent of what such research could do even if they were able to do it in the more general case..
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BigRatCommented:
Hmmm. It all sounds a bit hyped to me. The actual article states that the sensitivity is proportional to inverse square root of N, the number of particles, whereas with "entangled" particles it is inverse N. In actual fact the Heisenberg principle applies to ONE quantum entity, so it is just as applicable to an atom as to a mouse, and here we are in fact considering a Bose condensate of N particles are finding that, when not considered an one enitity, the relationship is not the same. As the article points out, the experiment confirms the theory so that yet again the original quantum theory is confirmed (alas)
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TommySzalapskiCommented:
People who write research papers and do big experiments always want to think their results are more important and cool then they really are (I'm speaking from personal experience here). When you are trying to publish a result, you basically are selling it to the reviewers so you need to make it look as impacting as you can. So I agree it's hyped. It's a consequence of the way we do research.
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NYGiantsFanAuthor Commented:
This has been an interesting discussion, however the Expert Exchange fascists have been deleteing questions I leave open, so I am closing this.

Thanks for your responses.
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