I don’t think it’s wrong, just simplified. You don’t really have to touch the photon, just affect the wave function, the statistical description of the photon’s movement through space and time. Detectors and polarizers, anything that can be used to tell exactly which path the photon took through the slits will do this. Quantum eraser experiments just show that you can “undo the damage” to the wave function, so to speak. You can get the wave function back into an unaltered state but by doing so you lose the which-way information.
I don’t think it’s wrong, just simplified. You don’t really have to touch the photon, just affect the wave function, the statistical description of the photon’s movement through space and time. Detectors and polarizers, anything that can be used to tell exactly which path the photon took through the slits will do this. Quantum eraser experiments just show that you can “undo the damage” to the wave function, so to speak. You can get the wave function back into an unaltered state but by doing so you lose the which-way information.