Well, the big trick is that photons really are excitation of the electromagnetic field, just like in classical mechanics. But at low energies the field is quantized, just like a harmonic oscillator. And we associate these quantized chunks of electromagnetic energy with particles. But it turns out that you still have to ask the question “what does the electromagnetic field look like with two photons?” The electromagnetic field is more “real” than the photons.
Well, the big trick is that photons really are excitation of the electromagnetic field, just like in classical mechanics. But at low energies the field is quantized, just like a harmonic oscillator. And we associate these quantized chunks of electromagnetic energy with particles. But it turns out that you still have to ask the question “what does the electromagnetic field look like with two photons?” The electromagnetic field is more “real” than the photons.
Isn’t it always quantized?
Is the answer “the same as with one photon, except with six dimensions instead of three”?
I thought those were pretty much the same way of saying the two things.