Even with the current simple model system, one can clearly understand the recently discovered polaron decoupling effect 6,7,9 when coupling the molecular system with the photonic DOF. For a monomer coupled to a single mode cavity, under the resonant condition, ε + ϵ m = ℏω c , the light-matter interaction term in Eq. 37 causes the light-matter hybridization between the |G⟩ ⊗ |1⟩ with |m⟩ ⊗ |0⟩, resulting in the following polariton states