Qubit-oscillator system under ultrastrong coupling and extreme driving

Details Qubit-oscillator system under ultrastrong coupling and extreme driving Qubit-oscillator system under ultrastrong coupling and extreme driving

2010-09-08

arxiv.org/abs/1009.1485v2

Phys. Rev. A 83, 030301(R) (2011)

Physics

Quantum Physics

4+ pages, 5 figures (published version)

Scientific paper

10.1103/PhysRevA.83.030301

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.

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