Generalized rotating-wave approximation to the two-qubit and cavity coupling system
Abstract
The generalized rotating-wave approximation (GRWA) is presented for the two-qubit and cavity coipling system . The analytical expressions in the zeroth order approximation recover the previous adiabatic ones. The counterrotating-wave terms can be eliminated by performing the first order corrections. An effective solvable Hamiltonian with the same form as the ordinary RWA one are then obtained, giving a significantly accurate eigenvalues and eigenstates. Energy levels in the present GRWA are in accordant with the numerical exact diagonalization ones in the a wide range of coupling strength. The atomic population inversion in the GRWA is in quantitative agreement with the numerical results for different detunings in the ultrastrong coupling regime.
Cite
@article{arxiv.1410.1965,
title = {Generalized rotating-wave approximation to the two-qubit and cavity coupling system},
author = {Yu-Yu Zhang and Qing-Hu Chen},
journal= {arXiv preprint arXiv:1410.1965},
year = {2015}
}
Comments
6 pages,2 figures