GreenD
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Heisenberg Uncertainty principle
I read this article with equal interest and confusion;
Apparently (and it doesn't quite explain sufficiently why) we do not disturb what we observe! A very important, perhaps paradigm shifting discovery
http://www.scientificamerican.com/article.cfm?id=heisenbergs...
Yet, the heisenberg uncertainty principle of dpdx > h/4pi is still, of course, valid.
Can someone clear up what is going on here?
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neptunium
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it looks to me that they verified the law by experimentation i dont see a contradiction in the article..
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GreenD
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From what I read all I can tell is that their observation of particles did not "collapse" the wave function - the particles were in fact in both
states at once while being observed.
Which - is a violation of what heisenberg's conjecture was.
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phlogiston
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Wavefunction collapse is an old-fashioned view anyway. I think the concept quantum decoherence more closely describes what happens.
The wiki page is quite informative, but this guy's page greatly helps to grasp the concept on a more intuitive level.
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"If a rocket goes up, who cares where it comes down, that's not my concern said Wernher von Braun" - Tom Lehrer |
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GreenD
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Quote: Originally posted by phlogiston  | Wavefunction collapse is an old-fashioned view anyway. I think the concept quantum decoherence more closely describes what happens.
The wiki page is quite informative, but this guy's page greatly helps to grasp the concept on a more intuitive level. |
Reading it now - but from my original post - are they saying that they observed "shrodingers cat" dead and alive at the same time?
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kavu
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Such groundbreaking new information on quantum mechanics, especially the experimental sort, is much more complex than Schrödingers cat or a
wavefunction collapsing. I have not yet taken QM 1 and 2 and only know some of the outmost basic stuff. All I can say is that providing a
non-mathematical form of the new discovery is very very difficult even for the people working in the business.
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watson.fawkes
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The preprint of the original article is available at arxiv.org: Experimental demonstration of a universally valid error-disturbance uncertainty relation in spin-measurements.
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