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In the double-slit experiment, the "observer" is the one actually firing one photon. How does the observer fire one photon? Does not one have to "observe and "measure out" a single photon? How does one isolate one photon without collapsing it to begin with?

David R. Schools
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You reduce the intensity of the source of photons until it is statistically sufficiently likely that there is only one photon in the experiment at a time.