Dissipative dynamics of circuit-QED in the mesoscopic regime

Valentin Bonzom (1) , Hichem Bouzidi (1) , Pascal Degiovanni (1, 2)

1 Phys-ENS - Laboratoire de Physique de l'ENS Lyon
2 Department of Physics [Boston]

We investigate the behavior of a circuit QED device when the resonator is initially populated with a mesoscopic coherent field. The strong coupling between the cavity and the qubit produces an entangled state involving mesoscopic quasi-pointer states with respect to cavity dissipation. The overlap of the associated field components results in collapse and revivals for the Rabi oscillation. Although qubit relaxation and dephasing do not preserve these states, a simple analytical description of the dissipative dynamics of the circuit QED device including cavity relaxation as well as qubit dissipation is obtained from the Monte-Carlo approach. Explicit predictions for the spontaneous and induced Rabi oscillation signals are derived and sucessfully compared with exact calculations. We show that these interesting effects could be observed with a 10 photon field in forthcoming circuit QED experiments.

Mots clés: cavity QED; circuit QED; decoherence; entanglement; complementarity; Josephson qubits

Domaines: Physique Quantique [quant-ph]; Systèmes mésoscopiques et effet Hall quantique [cond-mat.mes-hall]

Valentin Bonzom, Hichem Bouzidi, Pascal Degiovanni. Dissipative dynamics of circuit-QED in the mesoscopic regime. The European Physical Journal D : Atomic, molecular, optical and plasma physics, 2008, 47 (1), pp.133. ⟨10.1140/epjd/e2008-00039-9⟩. ⟨ensl-00143274⟩