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Photons passing individually through double slits produce an interference pattern. If behind the slits there are detectors that can determine which slit a photon passed through, the interference pattern vanishes. This occurs, even if the decision to turn on the detectors is not made until after the photon has passed through the slit. Is this result the same with electrons, and other massive particles?
There is a claim that the dual-slit effect has been demonstrated on molecules having over 800 atoms.