Qubit-oscillator system under ultrastrong coupling and extreme driving
Qubit-oscillator system under ultrastrong coupling and extreme driving
We introduce an approach to studying a driven qubit-oscillator system in the ultrastrong coupling regime, where the ratio $g/\ensuremath{\Omega}$ between coupling strength and oscillator frequency approaches unity or goes beyond, and simultaneously for driving strengths much bigger than the qubit energy splitting (extreme driving). Both qubit-oscillator coupling and external driving …