Comment by emgee on Joint Configurations · 2011-01-10T20:52:37.510Z · LW · GW

It is not at all clear to me why a single half-mirror should result in two multiplications and not an addition in the case of there being more than one photon. After all they are added up when they strike the detector.

It is completely unmentioned why this would be the case, and would seem to bear explanation.