Superconducting high kinetic inductance resonators made from granular aluminum

ORAL

Abstract

We present experimental results on superconducting thin film resonators fabricated from granular aluminum. By employing an electron beam evaporation process that allows an in-situ integration with Josephson junctions, we fabricated high kinetic inductance resonators with the goal of measuring their internal dissipation and non-linearity. Our results are in agreement with a theoretically predicted kinetic inductance in the range of $1\,\rm{nH}$ per square. Measurements in the single photon regime show internal quality factors in excess of $10^5$ and self-Kerr coefficients in the range of $10 - 100\,\rm{Hz}$ per photon. \\ The obtained results are promising for applications in high characteristic impedance superconducting circuits for quantum information processing as well as for kinetic inductance detectors.

*We acknowledge support from the Alexander von Humboldt foundation

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Authors

  • L. Gruenhaupt

    • Physikalisches Institut, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany

  • S. T. Skacel

    • Physikalisches Institut, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany

  • N. Maleeva

    • Physikalisches Institut, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany

  • Z. Wang

    • Physikalisches Institut, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany

  • Alexey V. Ustinov

    • Physikalisches Institut, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
    • Karlsruhe Institute of Technology

  • Hannes Rotzinger

    • Physikalisches Institut, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
    • Karlsruhe Institute of Technology

  • I.M. Pop

    • Physikalisches Institut, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
    • Department of Applied Physics, Yale University, and Physikalisches Institut, Karlsruhe Institute of Technology