Generalized rotating-wave approximation to the two-qubit and cavity coupling system
- Resource Type
- Working Paper
- Authors
- Zhang, Yu-Yu; Chen, Qing-Hu
- Source
- Phys. Rev. A 91, 013814 (2015)
- Subject
- Quantum Physics
- Language
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.
Comment: 6 pages,2 figures