Local trimming of transmon qubit frequency by laser annealing of Josephson junctions

ORAL

Abstract

Limited control in the fabrication of Al-AlOx-Al Josephson junctions makes accurate targeting of the qubit transition frequency in superconducting quantum processors an outstanding challenge. We demonstrate a selective increase in junction resistance by localized thermal annealing using a focused diode laser source at room temperature. By tuning the irradiation time and incident laser power, we controllably increase junction resistance by up to 15%. We quantify the success of this targeting method by comparing transmon qubit transition frequencies and coherence before and after laser annealing.

*Research funded by Intel Corporation, QuTech-TNO SMO, IARPA (U.S. Army Research Office grant W911NF-16-1-0071) and the Swiss National Science Foundation (P2EZP2_165240).

–

Presenters

  • Nandini Muthusubramanian

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands
    • QuTech and Kavli Institute of Nanoscience Delft, Delft University of Technology

Authors

  • Nandini Muthusubramanian

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands
    • QuTech and Kavli Institute of Nanoscience Delft, Delft University of Technology

  • Alessandro Bruno

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience Delft, Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands

  • Brian M Tarasinski

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands
    • QuTech and Kavli Institute of Nanoscience Delft, Delft University of Technology

  • Andreas Fognini

    • Kavli Institute of Nanoscience Delft, Delft University of Technology

  • Ronald Hagen

    • Department of Optics, Netherlands Organization for Applied Scientific Research (TNO)

  • Leonardo DiCarlo

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands
    • QuTech and Kavli Institute of Nanoscience Delft, Delft University of Technology