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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• Nonequilibrium Quantum Phase Transitions in the Dicke Model
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• Analytical solutions for the Rabi model
• Characteristic spectra of circuit quantum electrodynamics systems from the ultrastrong- to the deep-strong-coupling regime
• Symmetric Rotating Wave Approximation for the Generalized Single-Mode Spin-Boson System
• Observation of the Bloch-Siegert shift in a driven quantum-to-classical transition
• Single-photon scattering on a strongly dressed atom
• Quantum thermometry using the ac Stark shift within the Rabi model
• Metastability in the driven-dissipative Rabi model
• The reaction coordinate mapping in quantum thermodynamics
• Dissipation and detection of polaritons in ultrastrong coupling regime
• Large-Scale Schrödinger-Cat States and Majorana Bound States in Coupled Circuit-QED Systems
• Dissipative dynamics in a tunable Rabi dimer with periodic harmonic driving
• Non-perturbative interpretation of the Bloch vector's path beyond rotating wave approximation
• Transmission spectra of the driven, dissipative Rabi model in the USC regime
• Superharmonic Resonances in a Strongly Coupled Cavity-Atom System
• Driving-induced resonance narrowing in a strongly coupled cavity-qubit system
• Detecting ground state qubit self-excitations in circuit QED: slow quantum anti-Zeno effect
• Solvable model of dissipative dynamics in the deep strong coupling regime
• Bipartite entanglement of localized separated systems