Radiative Losses in Superconducting Coplanar Resonators

ORAL

Abstract

Radiation is a potential loss mechanism in superconducting qubits. Radiation loss was studied in superconducting coplanar resonators, which are important both in coupling superconducting qubits and because they provide a simple system to quantitatively measure the resulting effects. We fabricated various designs of 8 GHz resonators and measured the resulting reduction of the high-power $Q$ due to radiation. We found that the radiation loss was suppressed by a factor of 15 as compared to a simple theoretical model. We attribute this to the effects of the device mount on the radiation pattern, and we conclude that radiation is an unlikely decoherence mechanism for the present generation of qubits and resonators.

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Authors

  • James Wenner

    • University of California, Santa Barbara

  • Radoslaw Bialczak

    • University of California, Santa Barbara

  • Michael Lenander

    • University of California, Santa Barbara

  • Erik Lucero

    • University of California, Santa Barbara

  • Matteo Mariantoni

    • University of California, Santa Barbara

  • Matthew Neeley

    • University of California, Santa Barbara

  • Aaron O'Connell

    • University of California, Santa Barbara

  • Daniel Sank

    • University of California, Santa Barbara

  • Haohua Wang

    • University of California, Santa Barbara

  • Martin Weides

    • University of California, Santa Barbara

  • Tsuyoshi Yamamoto

    • University of California, Santa Barbara

  • Yi Yin

    • University of California, Santa Barbara

  • Andrew Cleland

    • University of California, Santa Barbara
    • University of California at Santa Barbara
    • UC Santa Barbara

  • John Martinis

    • Department of Physics, University of California, Santa Barbara, California 93106, USA
    • University of California, Santa Barbara