(2) The first two terms and the last two terms are associated with the molecule (H m ) and the cavity radiation mode (H c ), respectively. The mass-weighted momentum and coordinate of the molecular mode are denoted by p m and x m . The molecule is characterized by a symmetric double-well model with two local minima at x m = ±a separated by a barrier height of E b at the origin x m = 0. The cavity radiation mode is modeled as a harmonic oscillator with momentum p c , coordinate q c , and frequency ω c . The light-matter coupling induces an equilibrium displacement in the cavity coordinate by