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.

*This material is based upon work supported by the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers, Superconducting Quantum Materials and System Center (SQMS) under contract number DE-AC02-07CH11359.

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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