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

Leppäkangas, J., Brehm, J. D., Yang, P., Guo, L., Marthaler, M., Ustinov, A. V. and Weides, M. (2019) Resonance inversion in a superconducting cavity coupled to artificial atoms and a microwave background. Physical Review A: Atomic, Molecular and Optical Physics, 99(6), 063804. (doi: 10.1103/PhysRevA.99.063804)

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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.

Item Type:Articles
Additional Information:This work was supported by the European Research Council (ERC) under the Grant Agreement 648011, Deutsche Forschungsgemeinschaft (DFG) within Project No. WE4359/7-1, the Initiative and Networking Fund of the Helmholtz Association, the China Scholarship Council (CSC), and Studienstiftung des deutschen Volkes. We also acknowledge support provided by the Initiative and Networking Fund of the Helmholtz Association, within the Helmholtz Future Project Scalable solid state quantum computing. This work was also partially supported by the Ministry of Education and Science of the Russian Federation in the framework of the Program to Increase Competitiveness of the NUST MISIS, contract no. K2-2017-081.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Weides, Professor Martin
Authors: Leppäkangas, J., Brehm, J. D., Yang, P., Guo, L., Marthaler, M., Ustinov, A. V., and Weides, M.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Physical Review A: Atomic, Molecular and Optical Physics
Publisher:American Physical Society
ISSN:2469-9926
ISSN (Online):2469-9934
Published Online:04 June 2019
Copyright Holders:Copyright © 2019 American Physical Society
First Published:First published in Physical Review A 99(6): 063804
Publisher Policy:Reproduced in accordance with the publisher copyright policy
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