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Publication Citation: Development of a Quantum-Voltage-Calibrated Noise Thermometer at NIM

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Author(s): Jifeng Qu; Samuel P. Benz; Jianqiang Zhang; Horst Rogalla; Yang Fu; Alessio Pollarolo; Jintao Zhang;
Title: Development of a Quantum-Voltage-Calibrated Noise Thermometer at NIM
Published: September 11, 2013
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.
Conference: 9th International Temperature Symposium (ITS9)
Proceedings: Temperature: Its Measurement and Control in Science and Industry, Vol. 8
Volume: 8
Pages: pp. 29 - 33
Location: Anaheim, CA
Dates: March 19-23, 2012
Keywords: Boltzmann constant, Correlation, Josephson junction arrays, Noise, Quantization, Thermometry
Research Areas: Quantum Electrical Measurements, Johnson Noise Thermometry, Quantum Devices
DOI:  (Note: May link to a non-U.S. Government webpage)
PDF version: PDF Document Click here to retrieve PDF version of paper (515KB)