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I don't know if EM phase coherence is a question of quantum entanglement. I think it can be achieved regardless of it i.e. if a laser was made of unentangled ph

I don't know if EM phase coherence is a question of quantum entanglement. I think it can be achieved regardless of it i.e. if a laser was made of unentangled photons that just happened to be in phase, it'd still function as a laser. Imagine if all the photons in a laser are entangled: it'd mean any partial interference with the laser would interfere with the whole wave .. which, correct me if I'm wrong, but I don't think that happens. Like not all lasers are bose einstein condensates, though lasers can be made from the emissions of such a state. I could be entirely wrong about this. It's been a while since I went back to quantum physics.

PaulHoule 7y ago
See https://en.wikipedia.org/wiki/Bose%E2%80%93Einstein_statistics https://en.wikipedia.org/wiki/Bose%E2%80%93Einstein_statisti... "The aggregation of particles in the same state, which is a characteristic of particles obeying Bose–Einstein statistics, accounts for the cohesive streaming of laser light" Fermi statistics mean that you can't put two electrons in the same state, but photons want to dogpile into the same state, that's what stimulated emission is all about.