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A New Approach to Johnson Noise Thermometry Using a Josephson Quantized Voltage Source for Calibration

Published

Author(s)

Samuel Benz, John M. Martinis, Sae Woo Nam, Weston L. Tew, Douglas R. White

Abstract

We describe a new approach to Johnson Noise Thermometry (JNT) that addresses certain limitations found in the conventional approach. The concept takes advantage of recent advances in digital synthesis and signal processing techniques together with advances in Josephson voltage standards. By using the perfect quantization fo voltages from the Josephson effect, a synthesized broadband waveform can be used as a calculable noise source for calibrations. A collaboration between NIST and the MSI explores this approach with the initial goal of creating a JNT measurement system capable of achieving relative accuracies of 0.001% in the range of temperatures between 84K and 430K. In this paper, we discuss the use of a broadband Josephson waveform generator to produce a calculable reference noise source, the related metrological challenges, the technical advantages conveyed by this approach, and the commensurate opportunities to advance the state of the field.
Proceedings Title
International Symposium on Temperature and Thermal Measurement in Industry and Science: TEMPMEKO | 8th | | VDE - Verlag GmbH
Volume
1
Conference Dates
June 19-21, 2001
Conference Location
Berlin, 1, GE
Conference Title
TEMPMEKO

Keywords

correlation, Johnson noise, Josephson junction, Nyquist, temperature, thermometry, voltage standard, waveform snythesis

Citation

Benz, S. , Martinis, J. , Nam, S. , Tew, W. and White, D. (2002), A New Approach to Johnson Noise Thermometry Using a Josephson Quantized Voltage Source for Calibration, International Symposium on Temperature and Thermal Measurement in Industry and Science: TEMPMEKO | 8th | | VDE - Verlag GmbH, Berlin, 1, GE, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=830743 (Accessed May 31, 2023)
Created March 31, 2002, Updated October 12, 2021