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Nb surface encapsulation to improve resonators quality factor

ORAL

Abstract

Nb qubits relaxation time are limited by the Nb2O5 layer at the metal air interface. This study is aimed to limit the formation of the oxide layer, encapsulating the Nb surface with other superconducting materials such as Ta, TiN and Re or with dielectric materials. To better understand the results, we are realizing these studies on coplanar waveguide resonators where the relation between surface losses and quality factor is clear.

In this work we present the results obtained on resonators encapsulated with different superconducting materials and the improvement we obtained on the quality factor.

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Presenters

  • Francesco Crisa

    Illinois Institute of Technology

Authors

  • Francesco Crisa

    Illinois Institute of Technology

  • Mustafa Bal

    Fermilab

  • Shaojiang Zhu

    Fermilab

  • Akshay A Murthy

    Fermilab, Fermi National Accelerator Laboratory

  • ZuHawn Sung

    Fermilab

  • Jaeyel Lee

    Fermilab

  • Daniel Bafia

    Fermilab, Fermi National Accelerator Laboratory

  • David van Zanten

    Fermilab, FermiLab, SQMS - Fermilab

  • Grigory Eremeev

    Fermilab

  • Ivan Nekrashevich

    Fermi National Accelerator Laboratory, Fermilab, Fermi National Accelerator Laboratory, Batavia, IL 60510, USA

  • Roman Pilipenko

    National Accelerator Laboratory, Fermilab, Fermi National Accelerator Laboratory

  • Anna Grassellino

    Fermilab

  • Alexander Romanenko

    Fermilab

  • Florent Q Lecocq

    National Institute of Standards and Technology, Boulder, National Institute of Standards and Technology, National Institute of Science and Technology

  • Michael R Vissers

    NIST Boulder, National Institute of Standards and Technology, Boulder, NIST, National Institute of Standards and Technology, National Institute of Standards and Technology Boulder

  • Joel N Ullom

    National Institute of Standards and Technology Boulder, National Institute of Standards and Technology

  • José Aumentado

    National Institute of Standards and Technology Boulder

  • Peter Hopkins

    National Institute of Standards and Technology Boulder, National Institute of Standards and Technology, National Institute of Science and Technology

  • Anthony Q McFadden

    University of California, Santa Barbara, NIST, National Institute of Standards and Tech, National Institute of Standards and Technology

  • Corey Rae McRae

    NIST

  • David Olaya

    NIST, National Institute of Science and Technology, National Institute of Standards and Technology Boulder and University of Colorado-Boulder, National Institute of Standards and Technology Boulder, National Institute of Standards and Technology