Qubit-oscillator system under ultrastrong coupling and extreme driving

Abstract

We introduce an approach to studying a driven qubit-oscillator system in the ultrastrong coupling regime, where the ratio $g/\Omega$ 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 lead to a dressing of the qubit tunneling matrix element of different nature: the former can be used to suppress selectively certain oscillator modes in the spectrum, while the latter can bring the qubit's dynamics to a standstill at short times (coherent destruction of tunneling) even in the case of ultrastrong coupling.

4+ pages, 5 figures (published version)

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Cited by in corpus (1)

• Detecting ground state qubit self-excitations in circuit QED: slow quantum anti-Zeno effect