Generalized rotating-wave approximation for the quantum Rabi model with optomechanical interaction

• URL: http://arxiv.org/abs/2303.16164v1
• Date: Tue, 28 Mar 2023 17:28:19 GMT
• Title: Generalized rotating-wave approximation for the quantum Rabi model with optomechanical interaction
• Authors: Wallace H. Monta\~no and Jes\'us A. Maytorena
• Abstract summary: We investigate the spectrum of energy and eigenstates of a hybrid cavity optomechanical system. The degree of polariton-phonon entanglement of the eigenstates presents a non-monotonic behavior.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We investigate the spectrum of energy and eigenstates of a hybrid cavity optomechanical system, where a cavity field mode interacts with a mechanical mode of a vibrating end mirror via radiation pressure and with a two level atom via electric dipole interaction. In the spirit of approximations developed for the quantum Rabi model beyond rotating-wave approximation (RWA), we implement the so-called generalized RWA (GRWA) to diagonalize the tripartite Hamiltonian for arbitrary large couplings. Notably, the GRWA approach still allows to rewrite the hybrid Hamiltonian in a bipartite form, like a Rabi model with dressed atom-field states (polaritons) coupled to mechanical modes through reparametrized coupling strenght and Rabi frequency. We found a more accurate energy spectrum for a wide range of values of the atom-photon and photon-phonon couplings, when compared to the RWA results. The fidelity between the numerical eigenstates and its approximated counterparts is also calculated. The degree of polariton-phonon entanglement of the eigenstates presents a non-monotonic behavior as the atom-photon coupling varies, in contrast to the characteristic monotonic increase in the RWA treatment.

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