Multilevel Effects in a Driven Generalized Rabi Model

Research output: Contribution to journalArticleScientificpeer-review


Research units

  • University of Oulu


We study numerically the onset of higher-level excitations and resonance frequency shifts in the generalized multilevel Rabi model with dispersive coupling under strong driving. The response to a weak probe is calculated using the Floquet method, which allows us to calculate the probe spectrum and extract the resonance frequency. We test our predictions using a superconducting circuit consisting of a transmon coupled capacitively to a coplanar waveguide resonator. This system is monitored by a weak probe field and at the same time driven at various powers by a stronger microwave tone. We show that the transition from the quantum to the classical regime is accompanied by a rapid increase of the transmon occupation and consequently that the qubit approximation is valid only in the extreme quantum limit.


Original languageEnglish
Pages (from-to)354–364
Number of pages11
JournalJournal of Low Temperature Physics
Issue number5-6
Publication statusPublished - Jun 2018
MoE publication typeA1 Journal article-refereed

    Research areas

  • Floquet method, Multilevel effects, Quantum Rabi model

ID: 17473329