Effects of laser-annealing on fixed-frequency superconducting qubits

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  • Hyunseong Kim
    Department of Physics, University of California 1 , Berkeley, California 94720, USA
  • Christian Jünger
    Computational Research Division, Lawrence Berkeley National Laboratory 2 , Berkeley, California 94720, USA
  • Alexis Morvan
    Computational Research Division, Lawrence Berkeley National Laboratory 2 , Berkeley, California 94720, USA
  • Edward S. Barnard
    Molecular Foundry Division, Lawrence Berkeley National Laboratory 3 , Berkeley, California 94720, USA
  • William P. Livingston
    Department of Physics, University of California 1 , Berkeley, California 94720, USA
  • M. Virginia P. Altoé
    Molecular Foundry Division, Lawrence Berkeley National Laboratory 3 , Berkeley, California 94720, USA
  • Yosep Kim
    Computational Research Division, Lawrence Berkeley National Laboratory 2 , Berkeley, California 94720, USA
  • Chengyu Song
    Molecular Foundry Division, Lawrence Berkeley National Laboratory 3 , Berkeley, California 94720, USA
  • Larry Chen
    Department of Physics, University of California 1 , Berkeley, California 94720, USA
  • John Mark Kreikebaum
    Department of Physics, University of California 1 , Berkeley, California 94720, USA
  • D. Frank Ogletree
    Molecular Foundry Division, Lawrence Berkeley National Laboratory 3 , Berkeley, California 94720, USA
  • David I. Santiago
    Department of Physics, University of California 1 , Berkeley, California 94720, USA
  • Irfan Siddiqi
    Department of Physics, University of California 1 , Berkeley, California 94720, USA

Abstract

<jats:p>As superconducting quantum processors increase in complexity, techniques to overcome constraints on frequency crowding are needed. The recently developed method of laser-annealing provides an effective post-fabrication method to adjust the frequency of superconducting qubits. Here, we present an automated laser-annealing apparatus based on conventional microscopy components and demonstrate preservation of highly coherent transmons. In addition, we perform noise spectroscopy to investigate the change in defect features, in particular, two-level system defects, after laser-annealing. Finally, we present a local heating model as well as demonstrate aging stability for laser-annealing on the wafer scale. Our work constitutes an important step toward both understanding the underlying physical mechanism and scaling up laser-annealing of superconducting qubits.</jats:p>

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