What is the minimum distance between photons?
YYY : Nothing. Photons are bosons, they can at least overlap with each other.
zzz: The photons do not have such “hate” for each other — they do not have the principle of Paulie’s prohibition, so there are no limitations in this regard. Well, unless you can pump so many photons into a very small area that a black hole is formed). But this is clearly beyond our capabilities.
XXX: How much do I need to pump?
You promise that you will not.