A two-level atom coupled to a single quantized cavity mode exchanges photons coherently. With n photons in the cavity, the Rabi frequency is Ω_n = g√(n+1) — even the vacuum (n=0) drives oscillations.
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Jaynes-Cummings Hamiltonian: H = ℏΔσ_z/2 + ℏg(a†σ₋ + aσ₊). On resonance: |e,n⟩ ↔ |g,n+1⟩ with frequency g√(n+1). Collapse and revivals occur for coherent state input.