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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|
|Pages:||pp. 29 - 33|
|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:||http://dx.doi.org/10.1063/1.4821369 (Note: May link to a non-U.S. Government webpage)|
|PDF version:||Click here to retrieve PDF version of paper (515KB)|