Title

The quantum Rabi model for two qubits

Author

BLAS MANUEL RODRIGUEZ LARA

Access level

Open Access

Summary or description

We study a system composed of two nonidentical qubits coupled to a single mode quantum field. We calculate the spectra of the system in the deepstrong-coupling regime via perturbation theory up to second order corrections, and show that it converges to two forced oscillator chains for cases well into that regime. Our predictions are confirmed by numerical calculation of the spectra using a parity decomposition of the corresponding Hilbert space. The numerical results point to two interesting behaviors in the ultra-strong-coupling regime: the rotating wave approximation is valid for some particular cases and there exist crossings in the spectra within each parity subspace. We also present the normal modes of the system and give an example of the time evolution of the mean photon number, population inversion, von Neuman entropy and Wootters concurrence in the ultra-strong- and deep-strongcoupling regimes.

Publisher

Journal of Physics A: Mathematical and Theoretical

Publish date

July 29, 2013

Publication type

Article

Publication version

Accepted Version

Format

application/pdf

Language

English

Audience

Students

Researchers

General public

Citation suggestion

Chilingaryan, S. A., and Rodríguez-Lara, B. M., (2013). The quantum Rabi model for two qubits, Journal of Physics A: Mathematical and Theoretical, Vol. 46(33):1-14

Source repository

Repositorio Institucional del INAOE

Downloads

21

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