It seems that - I am getting conflicting information from the forum posts about the above topic. Is there any difference in the properties (such as energy, intensity, spin, momentum etc): of a photon that emerges from a double slit without which-way Vs which-way? or in other words does a photon strike with a different energy on the screen when which-way known vs no-detector. or in other words does a self-interfered photon have properties that are different from a non-self-interfered photon?....other than the fact that a self-interfered photon will land up on fringes instead of the "two blobs" in front of the two slits. or in other words does superposition result in any change in the properties of a photon?