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Allegedly. I was disappointed to find out this is theoretical and they did not actually cut a photon in two.
So the mass of the universe would suddenly become infinite?
No, that infinite swarm is in a superposition, so each photon contributes only an infinitesimal amount of energy. The net effect from a distance acts exactly like the original photon.

Assuming it could be done at all, which it can't. The article says "If you could do an impossible thing you'd get a strange result", which, duh.