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I Criss-cross multiple double slit experiment paths?

  1. Dec 26, 2016 #1
    Has someone attempted to criss-cross multiple double slit experiment paths? The purpose would be to mix paths of observed and free particles. I want to know if clumps and fringes appear everywhere or we would get something new.
    Last edited by a moderator: Dec 26, 2016
  2. jcsd
  3. Dec 26, 2016 #2


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    Cross-cross multiple double slits? Mix paths of observed and free particles?

    What are these?

    If you want interference patterns from multiple slits, what is wrong with the current multi-slit experiments that we already have? Diffraction grating experiments are almost standard intro physics lab exercise.

  4. Dec 26, 2016 #3
    Nothing interesting would happen. A particle's wavefunction interferes only with itself, not with another's, even of the same type. So the only effect would be that two particles from the two "criss-crossed emitters" (so to speak) might collide, or influence each other's path by electromagnetic repulsion if they had a charge. That would simply cause them not to hit the detector (probably) and, if they did, probably destroy the interference pattern. Of course with photons there would be effect at all.

    PS @ZapperZ, he means to put two emitter / detectors at right angles to each other so the paths cross. if you want to be a teacher you have to learn to speak studentese.
  5. Dec 26, 2016 #4


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    You cannot distinguish identical particles.
    You can have interference between two laser beams if their phases are coupled, or if the coherence length is long enough. You can even go further and reduce the laser intensities so much that detecting two photons at the same time is unlikely. Pfleegor and Mandel, 1967.

    You can have the same effect, but easier to produce, with radio waves.
  6. Dec 26, 2016 #5
    Of course, we all know that. I didn't feel any need to go into those exceptional cases, and OP's response shows I was right not to bother.
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