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Spectroscopy of a hidden two-level system environment using a fluxonium qubit with fast-flux tunability

ORAL

Abstract

Recent experiments on a granular aluminum (grAl) fluxonium qubit [1] have shown non-exponential relaxation dynamics spanning over tens of milliseconds,

when the qubit is stabilized in its excited / ground state via active feedback [2].

The observed behavior can be explained by the active heating / cooling of a hidden two-level system environment of unknown physical origin.

In order to mitigate this dominant relaxation channel for the qubit, it is essential to gain a better understanding of its origin.

Here we present a method to perform spectrocopy of this hidden environment using a similar grAl fluxonium qubit placed in a coplanar waveguide architecture with an integrated fast-flux coil.

[1] Grünhaupt and Spiecker et al., Nat. Mater. 18, 816–819 (2019)

[2] Spiecker et al., arXiv:2204.00499 (2022)

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Presenters

  • 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)

Authors

  • 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)

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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