Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

EPR experiment with twin photons then interference experiment

  1. Jun 27, 2013 #1
    If we have twin photons moving in the opposite direction.

    For the first photon we can pass it through a polarizer that will either output a photon with vertical polarization or a photon with horizontal polarization.

    after this experiment we now know what will the other unobserved photon polarization will be if it passes through this polarizer (EPR paradox)

    My question is .. what will be the results if we used the unobserved photon in an interference experiment. will it produce an interference pattern ?
     
  2. jcsd
  3. Jun 27, 2013 #2

    Nugatory

    User Avatar

    Staff: Mentor

    You'll have to tell us a lot more about what you mean by an "interference experiment", starting with what the particle will be interfering with.
     
  4. Jun 27, 2013 #3
    I am asking if it will interfere with it self. this single unobserved photon that we knew it's polarization by observing the polarization of it's twin. but the photon it self is unobserved.

    If we did this experiment multiple times. will there be an interference pattern ?
     
  5. Jun 27, 2013 #4

    DrChinese

    User Avatar
    Science Advisor
    Gold Member

    As it happens, the answer is NO. In the general case, entangled photons do not produce interference because they are not sufficiently coherent.

    See Zeilinger, page 290, figure 2, there is no direct interference pattern for entangled photons:

    Experiment and the foundations of quantum physics (1999)[/QUOTE]
     
  6. Jun 27, 2013 #5
    [/QUOTE]

    Thanks for the answer and the interesting link
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: EPR experiment with twin photons then interference experiment
  1. EPR thought experiment (Replies: 17)

  2. EPR Experiment in QFT? (Replies: 6)

  3. EPR thought experiment. (Replies: 13)

Loading...