Single-cryostat integration of the quantum anomalous Hall and Josephson effects

Published

August 30, 2024

Author(s)

Jason Underwood, Linsey Rodenbach, Ngoc Thanh Mai Tran, Alireza Panna, Zachary Barcikowski, Molly Andersen, Peng Zhang, Lixuan Tai, Randolph Elmquist, Dean Jarrett, David Goldhaber-Gordon, David Newell, Albert Rigosi

Abstract

By directly integrating a quantum anomalous Hall resistor (QAHR) and a programmable Josephson voltage standard (PJVS) into a single cryostat, we have implemented a quantum electrical reference that provides a realization of the volt, ohm, and ampere in accordance with the revised International System of Units (SI). The quantum voltage output from this prototype ranged from 0.24mV to 6.5mV with uncertainties down to 3$\mathbf\mu}$V/V. The colocated QAHR provided a realization of the ohm at zero magnetic field with uncertainties near 1$\mu\mathbf\Ω}/\mathbf\Ω}$ at $R_yx} \approx $25.9k$\mathbf\Ω}$. For the ampere, a longitudinal current applied to the QAHR is converted to a quantized Hall voltage, which was directly compared to the Josephson voltage, providing measurements of the ampere that are directly traceable to the revised SI. We determined currents in the range (9.33--252)nA with a total combined relative uncertainty of (41--4.3)$\mu$A/A, respectively. Limitations and improvements are discussed to aid in reproduction of similar instruments at other national metrology institutes.

Proceedings Title

2024 Conference on Precision Electromagnetic Measurements (CPEM)

Conference Dates

July 8-12, 2024

Conference Location

Denver, CO, US

Pub Type

Conferences

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Keywords

Measurement, measurement uncertainty, International System of Units, quantum standards, measurement techniques, voltage, current, resistance

Citation

Underwood, J. , Rodenbach, L. , Tran, N. , Panna, A. , Barcikowski, Z. , Andersen, M. , Zhang, P. , Tai, L. , Elmquist, R. , Jarrett, D. , Goldhaber-Gordon, D. , Newell, D. and Rigosi, A. (2024), Single-cryostat integration of the quantum anomalous Hall and Josephson effects, 2024 Conference on Precision Electromagnetic Measurements (CPEM), Denver, CO, US, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=957470 (Accessed October 6, 2025)