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

Juha Leppäkangas, Jan David Brehm, Ping Yang, Lingzhen Guo, Michael Marthaler, Alexey V. Ustinov, and Martin Weides
Phys. Rev. A 99, 063804 – Published 4 June 2019

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.

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  • Received 19 March 2019

DOI:https://doi.org/10.1103/PhysRevA.99.063804

©2019 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalQuantum Information, Science & TechnologyStatistical Physics & Thermodynamics

Authors & Affiliations

Juha Leppäkangas1,2, Jan David Brehm1, Ping Yang1, Lingzhen Guo3, Michael Marthaler2,4,5, Alexey V. Ustinov1,6, and Martin Weides1,7

  • 1Physikalisches Institut, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
  • 2HQS Quantum Simulations GmbH, 76131 Karlsruhe, Germany
  • 3Max Planck Institute for the Science of Light, 91058 Erlangen, Germany
  • 4Institut für Theorie der Kondensierten Materie, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
  • 5Theoretische Physik, Universität des Saarlandes, 66123 Saarbrücken, Germany
  • 6Russian Quantum Center, National University of Science and Technology MISIS, 119049 Moscow, Russia
  • 7School of Engineering University of Glasgow, Glasgow G12 8QQ, United Kingdom

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Issue

Vol. 99, Iss. 6 — June 2019

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