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Young experiment in gravity field

  1. Apr 23, 2010 #1
    The current Young optical experiment induces interference between 2 waves when the two intermediary holes are opened and interference dissapears as soon as an active detection system is used to know by which hole the particle flied thru.
    Surprisingly, even when particles are sent one to one the interference is maintained since it is not a statistical effect but the interference of the "quantic evolution wave" with itself.

    But what if a not-active detection system were used ?
    Typically considering that the two holes of the screen are not at the same height in a gravitational filed . The effect is light but the mossbauer shift of frequency related to relativist effect changes slighlty the frequency of the light and the influence of the hole number by which the particle fly thru could be detected.
    What is your viewpoint about this possibilty ?
  2. jcsd
  3. Apr 27, 2010 #2
    You detect the particle in specific points, where the frequency from both paths will be the same again.
  4. May 7, 2010 #3
    Interesting. But It would mean that particles will be detected even if you don t have any active interaction with the beam. If you have a free interference the fringe would be modify by the shift frequency depending from the height in the gravitational pit.
    To detect the particle in specific points, where the frequency from both paths will be the same again would mean that we would not have any detection since the frequency are shift from one way to another.
    But beyond the exchange do you know if the experiment was made ?
  5. May 10, 2010 #4
    How so?
    I don't understand this sentence, and believe it is wrong.

    I don't know.
  6. May 10, 2010 #5


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    It is a reasonable idea. Here is a practical issue: you can make "weak" measurements on particles in such a way that interference is only slightly degraded. If you then turn up the intensity of the measurement, the interference falls off accordingly. So a weak field like gravity likely wouldn't produce enough effect to do much.
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