Quote Originally Posted by Renton View Post
can more than one photon comprise the same wave?
Yes, in that case each photon's wave would have a total probability of 1.

Hmmm.. as I type that I realize that there could be such a case that the two waves are indistinguishable, and only the combined wave packet will be measurable. I think the normalization step is still required, but we're talking quite generally.

In this case, the information of both would be contained in the packet, and the packet would be treated as a single pair... if that makes sense.

The number of photons is conserved in all reference frames. I believe this even comes up in Max Plank's original derivation of blackbody radiation.