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Characterizing the reliability and coherence-time impact of laser annealing on transmon-qubit Josephson junctions.

ORAL

Abstract

Laser annealing is a demonstrated technique for tuning the normal-state resistance of Josephson junctions and thereby the operating frequency of superconducting qubits. However, before entrusting laser annealing as a viable post-fabrication trimming process for multi-qubit quantum processors, it is paramount to characterize its reliability and impact on qubit coherence times. We demonstrate a simple, fully automated, closed-loop, laser annealing implementation that iteratively and selectively increases junction resistances towards an arbitrary target up to 15% above the starting value. Our setup minimizes complexity, showcasing the simplicity with which reliable frequency targeting can be achieved. We investigate the reliability and coherence impact of laser annealing performed on 17-transmon quantum processors.

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Publication: -

Presenters

  • Sean van der Meer

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

Authors

  • Sean van der Meer

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

  • Nandini Muthusubramanian

    QuTech, Kavli Institute of Nanoscience, Delft University of Technology, Delft University of Technology

  • Matvey Finkel

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

  • Christos Zachariadis

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

  • Alessandro Bruno

    QuTech and Kavli Institute of Nanoscience, Delft University of Technology, The Netherlands, Delft University of Technology, QuTech, Kavli Institute of Nanoscience, Delft University of Technology, QuTech and Kavli Institute of Nanoscience, Delft University of Technology, and Quantware, B.V., The Netherlands

  • Leonardo DiCarlo

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