We believe that this step has already beentaken, but not fully acknowledged, by a substantial part of the quantum-opticscommunity. For example, three review articles (2−4) on light squeezing makeextensive use of phase-space diagrams, and one of them(3) states explicitly thatthe photon description of the light field is not helpful in the understanding ofthe phenomenon

The quantum harmonic oscillator is the quantum analog of the classical harmonic oscillator and is one of the most important model systems in quantum mechanics. This is due in partially to the fact that an arbitrary potential curve V(x)V(x)V(x) can usually be approximated as a harmonic potential at the vicinity of a stable equilibrium point. Furthermore, it is one of the few quantum-mechanical systems for which an exact, analytical solution exists. Solving other potentials typically require either approximations or numerical approaches to identify the corresponding eigenstates and eigenvalues (i.e., wavefunctions and energies).

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