Highly Uniform Submicron Junction Arrays for Quantum Information Processing

ORAL

Abstract

Josephson junctions are an ubiquitous circuit element in cQED experiments. In complex devices with many such junctions, precise control over each junction’s critical current is often required, and thus variations of the junction area and tunnel barrier thickness must be sufficiently minimized. Analyzing junction array resistance distributions from many wafers, we have identified several key processing variables to improve uniformity. Nevertheless, the uniformity of as-fabricated junctions leaves much to be desired as quantum processors or single microwave photon detectors requiring 100’s or 1000’s of junctions begin to be realized. Therefore, we also present progress in implementing laser annealing techniques to fine tune junction resistances post-fabrication.

*This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division under Contract No. DE-AC02-05-CH11231 within the QISLBNL program.

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Presenters

  • John Mark Kreikebaum

    • Lawrence Berkeley National Laboratory
    • University of California, Berkeley
    • Univ of California – Berkeley
    • Physics, University of California, Berkeley

Authors

  • John Mark Kreikebaum

    • Lawrence Berkeley National Laboratory
    • University of California, Berkeley
    • Univ of California – Berkeley
    • Physics, University of California, Berkeley

  • Larry Chen

    • University of California, Berkeley
    • Physics, University of California, Berkeley
    • Univ of California – Berkeley

  • Alexis Morvan

    • University of California, Berkeley
    • Lawrence Berkeley National Laboratory
    • Laboratoire de Physique des Solides, CNRS - Université Paris Saclay

  • Jean-Loup Ville

    • University of California, Berkeley
    • University of California - Berkeley

  • Kevin O'Brien

    • Massachusetts Institute of Technology MIT
    • Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology
    • Univ of California – Berkeley
    • Massachusetts Institute of Technology

  • Irfan Siddiqi

    • Lawrence Berkeley National Laboratory
    • University of California, Berkeley
    • Univ of California - Berkeley
    • Univ of California – Berkeley
    • Quantum Nanoelectronics Lab, UC Berkeley
    • Physics, University of California, Berkeley
    • Quantum Nanoelectronics Laboratory, Dept. of Physics, University of California, Berkeley