Quantum Current Sensor Integrating Quantum Anomalous Hall and Josephson Effects

ORAL

Abstract

Following the International System of Units (SI) redefinition, the units volt and ohm are directly realized via quantum-based standards (the Programmable Josephson Voltage Standard (PJVS) and the Quantum Hall Resistance Standard (QHRS), respectively). Direct realization of the ampere is then achievable through application of Ohm’s Law. However, direct integration of the PJVS and QHRS is challenging due to their vastly different magnetic field requirements. By leveraging the zero-field quantization of a quantum anomalous Hall (QAH) resistor in conjunction with a PJVS, we have demonstrated a direct realization of the Ampere with a quantum current sensor (QCS) in a single cryostat, precisely determining current over the range (9.33–252) nA. QCS accuracy was assessed by comparison to an indirect Ohm’s law measurement of the same current source, using both the QAH resistor and a PJVS-calibrated digital multimeter. The closest agreement, (1.46 +/- 4.28) x 10-6 A/A, was found at 83.9 nA. In this talk, I will discuss the direct and indirect measurement results, as well as the integration of the QAH resistor and PJVS in a single cryostat.

*L.K.R., M.P.A. and D.G.-G. were supported by the Air Force Office of Scientific Research (AFOSR) Multidisciplinary Research Program of the University Research Initiative (MURI) under grant number FA9550-21-1-0429. Initially, L.K.R., M.P.A. and D.G.-G. were supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division,under Contract No. DE-AC02- 76SF00515 and the Gordon and Betty Moore Foundation through Grant No. GBMF9460. P.Z., L.T. and K.L.W. acknowledge support from the National Science Foundation (NSF) (DMR-1411085 and DMR-1810163) and the Army Research Office MURI under grant numbers W911NF16-1-0472 and W911NF-19-S-0008. Work presented herein was performed, for a subset of the authors, as part of their official duties for the United States government. Funding is hence appropriated by the United States Congress directly. Part of this work was performed at nano@stanford, supported by the National Science Foundation under award ECCS-2026822.

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Presenters

  • Zac S Barcikowski

    • University of Maryland, College Park
    • National Institute of Standards and Technology

Authors

  • Zac S Barcikowski

    • University of Maryland, College Park
    • National Institute of Standards and Technology

  • Linsey K Rodenbach

    • Stanford Univ
    • Stanford University
    • Department of Physics, Stanford University, Stanford, California

  • Ngoc Thanh Mai Tran

    • National Institute of Standards and Technology
    • Physical Measurement Laboratory, National Institute of Standards & Technology, Gaithersburg, Maryland. & Joint Quantum Institute, University of Maryland, College Park, MD
    • Physical Measurement Laboratory, NIST

  • Jason M Underwood

    • National Institute of Standards and Technology

  • Alireza R Panna

    • NIST
    • National Institute of Standards and Technology

  • Molly P Andersen

    • Stanford University
    • Department of Physics, Stanford University, Stanford, California

  • Shamith Payagala

    • NIST
    • National Institute of Standard and Technology

  • Peng Zhang

    • University of California, Los Angeles

  • Lixuan Tai

    • University of California, Los Angeles
    • Department of Electrical and Computer Engineering, University of California, Los Angeles

  • Kang-Lung Wang

    • University of California, Los Angeles
    • UCLA

  • Randolph E Elmquist

    • National Institute of Standards and Technology

  • Dean G Jarrett

    • NIST
    • National Institute of Standards and Technology

  • David B Newell

    • National Institute of Standards and Technology

  • Albert F Rigosi

    • National Institute of Standards and Technology

  • David Goldhaber-Gordon

    • Stanford University
    • Stanford Institute for Materials and Energy Sciences, Stanford University Physics Department
    • Department of Physics, Stanford University, Stanford, California
    • Stanford Institute for Materials & Energy Sciences, Stanford University