uncertainty principle with measurement device recoil

Oct 05, 2012 1 Replies
J

Hi,



I read about a modification to the uncertainty principle that takes into account "recoil" in the measurement device, so that more information about the system is actually available than the uncertainty principle would predict:



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Here is another article that verified the measurement device recoil impact on measurement uncertainty from above:



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So if the measurement device inertia is very small then it will have more recoil so more information can be extracted? Also doesn't this imply that entanglement is incorrect?



cheers, Jamie



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S

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These experiments relate to error-disturbance relations, rather than the fundamental uncertainty relation.

See

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This is heavy-duty stuff, but my best take on it is that there is the underlying uncertainty relation on the one hand, and on the other hand, another relation that represents a theoretical limit on how close one can get to the underlying relation experimentally. It is this latter relation that is under test experimentally, and the experiments show that the originally supposed limit was too severe, and falsified, and that a more recent formulation of the limit remains a candidate for being the actual limit.

But the uncertainty principle remains intact, and phase entanglement is untouched.

Sylvia.

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