Let us say I have a classical field theory, with a field ϕ(→r,t) which satisfies the relevant Euler-Lagrange equation for the Lagrangian L. Is the general procedure (i.e. one that will work for any L) for going from this classical field to the quantum field operators in QFT?
I know that one can look at commutators, but is this really enough to uniquely specify the field operators?
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