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Fluxonium qubit limited by a collection of two-level systems

ORAL

Abstract

By running a quantum Szilard engine we actively heat or cool a two-level-system (TLS) environment [1]. The egnine consists of a granular aluminum fluxonium qubit [2] coupled on one side to the TLS environment and on the other side to a real-time measurement and control apparatus. We show that the TLSs and the qubit are each other's dominant loss mechanism, therefore their understanding and mitigation is not only crucial to improve qubit lifetimes but also to avoid non-Markovian qubit dynamics. We also show that a single pi-pulse on the qubit gives rise to measureable heating in the TLS environment, which complicates the task of superconducting qubit benchmarking.

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Publication: [1] Spiecker et al., arXiv:2204.00499 (2022)<br>[2] Grünhaupt and Spiecker et al., Nat. Mater. 18, 816–819 (2019)

Presenters

  • Martin Spiecker

    PHI, Karlsruhe Institute of Technology, Germany, IQMT and PHI, Karlsruhe Institute of Technology (KIT), Germany, Karlsruhe Institute of Technology (KIT), IQMT and PHI, Karlsruhe Institute of Technology (KIT), IQMT and PHI, Karlsruhe Institute of Technology

Authors

  • Martin Spiecker

    PHI, Karlsruhe Institute of Technology, Germany, IQMT and PHI, Karlsruhe Institute of Technology (KIT), Germany, Karlsruhe Institute of Technology (KIT), IQMT and PHI, Karlsruhe Institute of Technology (KIT), IQMT and PHI, Karlsruhe Institute of Technology

  • Patrick Paluch

    IQMT and PHI, Karlsruhe Institute of Technology, Germany, IQMT and PHI, Karlsruhe Institute of Technology (KIT), IQMT and PHI, Karlsruhe Institute of Technology (KIT), Germany, Karlsruhe Institute of Technology (KIT)

  • Niv Drucker

    Quantum Machines

  • Shlomi Matityahu

    Karlsruhe Institute of Technology (KIT)

  • Daria Gusenkova

    Karlsruhe Institute of Technology (KIT)

  • Francesco Valenti

    Karlsruhe Institute of Technology (KIT), IQMT and PHI, Karlsruhe Institute of Technology, Germany

  • Patrick Winkel

    PHI, Karlsruhe Institute of Technology, Germany, Karlsruhe Institute of Technology (KIT), Karlsruhe Institute of Technology

  • Dennis Rieger

    PHI, Karlsruhe Institute of Technology, Germany, IQMT and PHI, Karlsruhe Institute of Technology (KIT), Germany, Karlsruhe Institute of Technology (KIT), Karlsruhe Institute of Technology, PHI, Karlsruhe Institute of Technology

  • Nicolas Gosling

    IQMT, Karlsruhe Institute of Technology, Germany, IQMT and PHI, Karlsruhe Institute of Technology (KIT), Germany, Karlsruhe Institute of Technology (KIT), IQMT and PHI, Karlsruhe Institute of Technology, Germany

  • Simon Günzler

    PHI, Karlsruhe Institute of Technology, Germany, IQMT and PHI, Karlsruhe Institute of Technology (KIT), Germany, Karlsruhe Institute of Technology (KIT), IQMT and PHI, Karlsruhe Institute of Technology, Karlsruhe Institute of Technology

  • Ivan Takmakov

    Karlsruhe Institute of Technology (KIT), Karlsruhe Institute of Technology

  • Richard Gebauer

    Karlsruhe Institute of Technology (KIT), IPE, Karlsruhe Institute of Technology, Germany

  • Oliver Sander

    Karlsruhe Institute of Technology (KIT), IPE, Karlsruhe Institute of Technology, Germany

  • Gianluigi Catelani

    Forschungszentrum Jülich GmbH, Forschungszentrum Jülich

  • Alexander Shnirman

    Karlsruhe Institute of Technology (KIT)

  • Alexey V Ustinov

    Karlsruhe Institute of Technology, Karlsruhe Institute of Technology (KIT)

  • Wolfgang Wernsdorfer

    IQMT and PHI, Karlsruhe Institute of Technology, Germany, IQMT and PHI, Karlsruhe Institute of Technology (KIT), IQMT and PHI, Karlsruhe Institute of Technology (KIT), Germany, Karlsruhe Institute of Technology (KIT), IQMT and PHI, Karlsruhe Institute of Technology, Karlsruhe Institute of Technology

  • Yonatan Cohen

    Quantum Machines

  • Ioan M Pop

    IQMT and PHI, Karlsruhe Institute of Technology, Germany, IQMT and PHI, Karlsruhe Institute of Technology (KIT), IQMT and PHI, Karlsruhe Institute of Technology (KIT), Germany, Karlsruhe Institute of Technology (KIT), IQMT and PHI, Karlsruhe Institute of Technology, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany