Development of a Quantum-Voltage-Calibrated Noise Thermometer at NIM

Published

September 11, 2013

Author(s)

Jifeng Qu, Samuel Benz, Jianqiang Zhang, Horst Rogalla, Yang Fu, Alessio Pollarolo, Jintao Zhang

Abstract

A quantum-voltage-calibrated Johnson-noise thermometer was developed at NIM, which measures the Boltzmann constant k through comparing the thermal noise across a 100  sense resistor at the temperature of the triple point water to the comb-like voltage waveform synthesized with a bipolar-pulse-driven quantum-voltage-noise source. A measurement with integration period of 10 hours and bandwidth of 640 kHz results in a relative offset of 0.5x10^-6 from the current CODATA value of k, and a type A relative standard uncertainty of 23x10^-6. Benefiting from closely matched noise power and transmission line impedances, small nonlinearities in the cross-correlation electronics, and some other possible reasons, the derived k shows self-consistent values and standard uncertainties for different measurement bandwidths.

Proceedings Title

Temperature: Its Measurement and Control in Science and Industry, Vol. 8

Volume

8

Conference Dates

March 19-23, 2012

Conference Location

Anaheim, CA, US

Conference Title

9th International Temperature Symposium (ITS9)

Pub Type

Conferences

Download Paper

https://doi.org/10.1063/1.4821369

Local Download

Keywords

Boltzmann constant, Correlation, Josephson junction arrays, Noise, Quantization, Thermometry

Citation

Qu, J. , Benz, S. , Zhang, J. , Rogalla, H. , Fu, Y. , Pollarolo, A. and Zhang, J. (2013), Development of a Quantum-Voltage-Calibrated Noise Thermometer at NIM, Temperature: Its Measurement and Control in Science and Industry, Vol. 8, Anaheim, CA, US, [online], https://doi.org/10.1063/1.4821369, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=910779 (Accessed October 16, 2025)