Leakage Current Pathways in Josephson Arbitrary Waveform Synthesizer Standards

Published

February 26, 2025

Author(s)

Raegan Johnson, Jesus Mejia, Alain Rufenacht, Anna Fox, Nathan Flowers-Jacobs, Frederic Overney, Paul Dresselhaus, Samuel Benz

Abstract

The voltage errors related to ac leakage currents in Josephson arbitrary waveform synthesizer (JAWS) systems are significant contributors to the overall system accuracy. These ac leakage currents flow through paths (typically to ground) that are not part of the intended measurement circuit. This article examines output voltage discrepancies between two different but nominally identical circuit halves on a single JAWS circuit and shows that this discrepancy is dominated by ac leakage currents through the stray capacitance in the compensation leads. Methods to minimize these voltage errors will be discussed along with their associated limitations.

Citation

IEEE Transactions on Instrumentation and Measurement

Volume

74

Pub Type

Journals

Download Paper

https://doi.org/10.1109/TIM.2025.3545508

Local Download

Keywords

Leakage currents, Measurement uncertainty, Josephson junctions, Standards, Superconducting integrated circuits, Voltage measurement.

Citation

Johnson, R. , Mejia, J. , Rufenacht, A. , Fox, A. , Flowers-Jacobs, N. , Overney, F. , Dresselhaus, P. and Benz, S. (2025), Leakage Current Pathways in Josephson Arbitrary Waveform Synthesizer Standards, IEEE Transactions on Instrumentation and Measurement, [online], https://doi.org/10.1109/TIM.2025.3545508, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=958973 (Accessed June 28, 2025)