Resonance inversion in a superconducting cavity coupled to artificial atoms and a microwave background

Abstract

We demonstrate how heating of an environment can invert the line shape of a driven cavity. We consider a superconducting coplanar cavity coupled to multiple artificial atoms. The measured cavity transmission is characterized by Fano-type resonances with a shape that is continuously tunable by bias current through nearby (magnetic flux) control lines. In particular, the same dispersive shift of the microwave cavity can be observed as a peak or a dip. We find that this Fano-peak inversion is possible due to a tunable interference between a microwave transmission through a background, with reactive and dissipative properties, and through the cavity, affected by bias-current induced heating. The background transmission occurs due to crosstalk between the control and transmission lines. We show how such background can be accounted for by Jaynes-Cummings type models via modified boundary conditions between the cavity and transmission lines. We find generally that whereas resonance positions determine system energy levels, resonance shapes give information on system fluctuations and dissipation.

arXiv comment22 pages, 15 figures

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Cited by in corpus (4)

• Probing two driven double quantum dots strongly coupled to a cavity
• Coupling of hole double quantum dot in planar germanium to a microwave cavity
• The scattering coefficients of superconducting microwave resonators: II. System-bath approach
• Probing the Tavis-Cummings level splitting with intermediate-scale superconducting circuits