In the text Gerry Knight "Introduction to Quantum Optics" they start with electric and magnetic fields Ex(z,t)=(2ω2Vϵ0)q(t)sin(kz) and By(z,t)=(μ0ϵ0k)(2ω2Vϵ0)12˙q(t)cos(kz).
What I don't understand is how they simply identify q and ˙q with the position and momentum operators simply because the Hamiltonain is the same form as that of the Harmonic oscillator: H=12∫dV[ϵ0E2x(z,t)+1μ0B2y(z,t)]=12(˙q2+ω2q2). Whereas in the equations of electric and magnetic field, q and ˙q are not even functions of position or momentum. Also, do we then simply assume that they obey the commutation relation [ˆq,ˆp]=iℏ since we have identified them with the position and momentum operators which obey this commutation relation?
Thanks for any assistance.
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