To gain an intuitive understanding of this entropic reordering of polaritons, 427 consider the single excited subspace spanning the N excitonic states {|E n , 0⟩} of the molecular subsystems that is coupling to a cavity excitation |G, 1⟩ (one photon in the cavity). As explained before, such as in Fig. and in Sec. 1.2, each of the |E n , 0⟩ states are coupled to the |G, 1⟩ state through the light-matter coupling, g c , and this leads to the formation of a lower polariton, upper polariton, and N -1 dark-states. In reality, these polaritonic states also interact with their environment. For example, the molecular excitation {|E n , 0⟩} at site n is also interacting with some local dissipative environment, which will cause static disorder of the excitonic energies {E J }. To account for the interaction with the local environment, the authors 427,429 sample {E J } from a random Gaussian distribution. For each realization of {E J }, the corresponding polaritonic eigenstate |Ψ a ⟩ can be computed as |Ψ a ⟩ = j c a j |Φ j ⟩, where |Φ j ⟩ ∈ {|E J , 0⟩, |G, 1⟩} and c a j = ⟨Ψ a |Φ j ⟩, with the corresponding density matrix