Limitation and Future Directions. Despite sev-eral initial successes of the FGR theory (Eq. 41) and the quantum dynamics simulations, obviously, there are several limitations in the current work. [1]. The current theory and simulation assume that a single molecule is coupled to the cavity. On the other hand, the VSC experiments operate under a collective coupling regime, such that an estimated N = 10 6 ∼ 10 10 molecules are collectively coupled to the FabryPérot cavity for each cavity mode. This means that the light-matter coupling strength η c is really weak between individual molecules and the cavity, and the experimentally observed Rabi splitting will be Ω R ∝ √ N η c . Further, under the collective coupling regime, it is expected that the molecular orientations are isotropically distributed. Note that by considering fully isotropically distributed dipoles, classical rate theory predicts that there are no VSC effects. The furture theoretical development is needed to understand the collective effect when considering the isotropic dipole distribution.