First, we need to recall the unperturbed Hamiltonian for the 1D harmonic oscillator:
$$
H_0 = \frac{p^2}{2m} + \frac{1}{2}m\omega^2 x^2
$$
where $m$ is the mass of the particle, $\omega$ is the angular frequency, and $x$ and $p$ are the position and momentum
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