I have a pretty solid understanding of ordinary quantum mechanics, but I’m hitting a conceptual block about quantum field theory. My understanding is that we are creating a wavefunction of possible field configurations. Therefore, I would guess that when we observe the field, we would collapse it to a particular field configuration. However, I don’t understand how particle positions emerge out of this. We aren’t creating a wavefunction of position, so why do excitations of the field have definite positions when we measure particle positions?
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