  We study quantum state transfer between two qubits coupled to a common
quantum bus that is constituted by an ultrastrong coupled light-matter system.
By tuning both qubit frequencies on resonance with a forbidden transition in
the mediating system, we demonstrate a high-fidelity swap operation even though
the quantum bus is thermally populated. This proposal may have applications on
hot quantum information processing within the context of ultrastrong coupling
regime of light-matter interaction.
