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I'm studying quantization of electromagnetic field (to see photon!) and on the way to reach harmonic oscillator Hamiltonian as a final stage, sudden transition that the Fourier components of vector potentialbecome quantum operators is observed. (See https://en.wikipedia.org/wiki/Quantization_of_the_electromagnetic_field)A

I guess Wikipedia doesn't describes much of the reason for this jump. It only states that the operator is for boson. I know photon is boson but how it can explain Fourier components ofshould become quantum operators? And besides, I originally expected to see the prove that photon is boson in this study.A

Could anybody help me to understand this?

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# How Fourier components of vector potential becomes operators

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