Here, we choose the parameters λ c = 5.15 meV and γ c = 800 meV for the cavity loss bath, corresponding to a cavity loss rate τ -1 c = 8.83 meV (c.f. Eq. 29) or a quality factor of Q ≈ 266 (when ω c = 2 eV), which is a typical experimental loss rate in a distributed Bragg reflector (DBR) cavity. This loss spectral density J loss (ω) in Eq. 29 is included in the HEOM exact quantum dynamics simulations. Of course, cavity loss also significantly contributes to the population decay of the |+⟩ state, and one can estimate the decoherence rate as 1