Allan: In Figure 3, is the total number of hits registered in the detectors equal to the total number of hits registered in Figure 2? Or is it half that number, because (intuitively and probably wrongly?) half the photons are hitting the wall?
Half the number. Because amplitude flows to a configuration where the photon hits the wall, and way up at the level of observation, that means we sometimes see no photon in any detector.
Allan: Is this sentence correct?
No. Ouch. Fixed.
Allan: In Figure 3, is the total number of hits registered in the detectors equal to the total number of hits registered in Figure 2? Or is it half that number, because (intuitively and probably wrongly?) half the photons are hitting the wall?
Half the number. Because amplitude flows to a configuration where the photon hits the wall, and way up at the level of observation, that means we sometimes see no photon in any detector.