1203.0423 (Ping Yang et al.)

Adiabatic approximation in the ultrastrong-coupling regime of a system
consisting of an oscillator and two qubits    [PDF]

Ping Yang, Zhi-Ming Zhang

We present a system composed of two flux qubits and a transmission-line resonator. Instead of using the rotating wave approximation (RWA), we analyse the system by the adiabatical approximation methods under two opposite extreme conditions. Basic properties of the system are calculated and compared under these two different conditions. Energy-level spectrum of the system in the adiabatical displaced oscillator basis is shown, and the theoretical result is compared with the numerical solution.

View original: http://arxiv.org/abs/1203.0423