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quote:What happens when the red laser light is slowed to one photon at a time (no, this can’t be done in your dining room)? That is, when only one photon is fired through each of the four slits, the same pattern appears. Could it be that, when the photon passes through the slits, they change course and recombine? Nope. When detectors are placed at each of the four slits, and one photon again is passed through them, only one of the detectors goes off, meaning that the photon hasn’t split.