Rabi model beyond the rotating wave approximation: generation of photons from vacuum through decoherence

Understand

We study numerically the dynamics of the Rabi Hamiltonian, describing the interaction of a single cavity mode and a two-level atom without the rotating wave approximation, subjected to damping and dephasing reservoirs included via usual Lindblad superoperators in the master equation.

• We show that the combination of the antirotating term and the atomic dephasing leads to linear asymptotic photons generation from vacuum.
• We reveal the origins of the phenomenon and estimate its importance in realistic situations.