  We analyze the dynamics of the quantum Rabi model for two qubits interacting
through a common bosonic field mode (resonator), focusing on the generation and
detection of maximally entangled Bell states. We obtain analytical results for
the unitary dynamics of this system in the slow-qubit (or degenerate) regime,
considering ultra-strong coupling between qubits and resonator mode, for which
the rotating wave approximation is no longer applicable. We also numerically
investigate the dynamics beyond the slow-qubit condition in order to study the
validity of the model in the presence of less strict conditions.
