Abstract

The Tavis-Cummings model for more than one qubit interacting with a common oscillator mode is extended beyond the rotating wave approximation (RWA). We explore the parameter regime in which the frequencies of the qubits are much smaller than the oscillator frequency and the coupling strength is allowed to be ultrastrong. The application of the adiabatic approximation introduced by Irish et al. [Phys. Rev. B 72, 195410 (2005)PRBMDO1098-012110.1103/PhysRevB.72.195410] for a single-qubit system is extended to the multiqubit case. For a two-qubit system, we identify three-state manifolds of close-lying dressed energy levels and obtain results for the dynamics of intramanifold transitions that are incompatible with results from the familiar regime of the RWA. We exhibit features of two-qubit dynamics that are different from the single-qubit case, including calculations of qubit-qubit entanglement. Both number …

Date

2012

Authors

S Agarwal, SM Hashemi Rafsanjani, JH Eberly

Journal

Physical Review A—Atomic, Molecular, and Optical Physics

Volume

85

Issue

4

Pages

043815

Publisher

American Physical Society