Cavity Light-Matter Entanglement through Quantum Fluctuations

Photon condensation, Van Vleck paramagnetism, and chiral cavities

“…Mean-field theory and photon condensation criterion.-To the end of studying the possible emergence of photon condensation, we approximate the ground-state of Ĥ as a product state of the form |Ψ = |ψ |φ , where |ψ and |φ are the matter and light quantum states [44][45][46][47][48], respectively. In the thermodynamic limit, the photonic state can be considered a coherent state â |φ α = α √ N |φ α .…”