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If we don't watch detector A and B .... When we open our "eyes"
I suggest placing an BBo crystal before the double slit to confirm every photon fired.
Now if a single photon really passes through both slits at the same time, what comes out of each slit must have about half the energy of the initial photon. So if we start with 2 eV (green) photons and put a high-pass (green) filter behind the slits, we won't get an interference pattern because all the half-energy (now infrared) photons will be absorbed by the filter. Has anyone tried this? I don't know of an actual published reference.
macroscopic version of the experiment is shown in quantum walker 3181.pdf