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Are there variations of double slit experiment with their results to look up? for example besided the two parallel slits, having two holes or two slits at 90 degree angles?

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The double slit experiment is a thought experiment, and it is not as important as people make it out to be. It is just a case where diffraction and quantum mechanics coincide, so it is useful for classical thinking people. Dirac uses polarizers, which is clearer because the Hilbert space is finite dimensional. – Ron Maimon Jun 23 '12 at 20:11

You might be interested in this paper Here, they perform an experimental test of Born's rule using not two, but three slits.

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Indeed that is type of thing that I am intrested, time to spice up the double slit experiment! – Arjang Jun 25 '12 at 4:39
Although this is strictly speaking a double-slit experiment, it is one of the great achievements of last year, so perhaps it sparks your curiosity as well: – Juan Miguel Arrazola Jun 25 '12 at 15:33

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