Multilevel Effects in a Driven Generalized Rabi Model

Quantum Physics ta114 Floquet method Condensed Matter - Mesoscale and Nanoscale Physics Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 8. Economic growth 0103 physical sciences Multilevel effects FOS: Physical sciences Quantum Physics (quant-ph) 01 natural sciences Quantum Rabi model 3. Good health
DOI: 10.1007/s10909-018-1857-8 Publication Date: 2018-01-30T12:51:37Z
ABSTRACT
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 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.<br/>12 pages, 4 figures<br/>
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