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Thread: Question about the double-slit experiment

  1. #1

    Question about the double-slit experiment

    I wonder if anybody can steer me in the right direction; I'm having no luck with google-fu. I remember reading somewhere that it was demonstrated that you could set up the double-slit experiment so that single photons going through slits would create an interference wave even if they were no in the detector at the same time. In other words, that they interfere even when they are separated in time. I would guess the experimental setup would be something like opening slit A and letting a photon go through, then closing it and opening slit B, and letting a photon go through. I remember vaguely that it was done by somebody with a name that started in A, like Ansari or something like that, but I could be totally wrong about the name.

    Anybody have any idea what I'm talking about?
    As above, so below

  2. #2
    Join Date
    May 2005
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    5,406
    No, both slits have to be open, otherwise no interference. The photon (or electron!) interferes with itself.

    See Variations at the double slit wiki:
    en.m.wikipedia.org/wiki/Double-slit_experiment

  3. #3
    Join Date
    Feb 2008
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    113
    Is this the experiement you were talking about? (I have no idea, personally.)

    http://phys.org/news/2011-06-quantum...ferometer.html

  4. #4
    Join Date
    Jun 2009
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    The version you're thinking of is the electron version. Hitachi even has it on their website, under Research. If it has been done with single photons, i'd imagine PMTs were involved.

    http://www.hitachi.com/rd/research/em/doubleslit.html

  5. #5
    I managed to figure out the experiment that I was thinking of, called the Afshar experiment. But unfortunately, my recollection seems to have been wrong, in that it wasn't demonstrating what I thought it was. I guess I was thinking about the Hitachi experiment, and got the two mixed up.

    There's a thread about the Afshar experiment from 2007, and I may be remembering it from that.
    As above, so below

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