In comparison to the above, the polariton weights for the zero photon case are shown in Fig. (b) for the same three initial states at ω c = ω 10 . Note that in Fig. , quantum mechanically the scaled isomerization probabilities for all three states exhibit suppression at this cavity frequency. Clearly, the states k = 1, 2 from the X 0 manifold are contributing predominantly in this case. However, note that the extent of contribution from the k = 3, 4, 5, and 6 polariton states belonging to the X 1 manifold varies and correlates with the extent of suppression observed in Fig. . Moreover, the vibropolaritonic eigenspectrum shown in Fig. ) exhibits an avoided crossing at ω c = ω 10 involving the four X 1 states, and hence a strong mixing of matter-photon character. As argued before, the extent of suppression of the scaled ⟨P iso ⟩ shown in Fig. (b) in the three cases again involves a combination of the modulation of the tunneling contribution and the extent to which photon like polariton states contribute to the dynamics (see Supplementary Fig. ). Thus, the initial state with q i = -0.439 au exhibits a more complicated dynamics when compared to the other two initial states. It is interesting to note that in this fairly simple model we are able to see a sub- stantial cavity-mediated modulation of the isomerization dynamics for ω c ≈ ω 10 in a "dark" cavity.