Connect with us

uncertainty principle with measurement device recoil

Discussion in 'Electronic Design' started by Jamie M, Oct 5, 2012.

  1. Jamie M

    Jamie M Guest

    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:

    http://www.nature.com/nphys/journal/v8/n3/abs/nphys2194.html

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

    http://phys.org/news/2012-10-certainty-uncertainty-quantum-mechanical-role.html

    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
     
  2. Sylvia Else

    Sylvia Else Guest

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

    See

    http://www.scientificamerican.com/article.cfm?id=heisenbergs-uncertainty-principle-is-not-dead

    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.
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-