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TitleProgress on Johnson noise thermometry using a quantum voltage noise source for calibration
Publication TypeJournal Article
Year of Publication2005
AuthorsNam, S.W., Benz S.P., Dresselhaus P.D., Jr. C.J. Burroughs, Tew W.L., White D.R., and Martinis J.M.
JournalIEEE Transactions on Instrumentation and Measurement
Pagination653 - 657
Date Published2005
ISSN00189456 (ISSN)
KeywordsAnalog to digital conversion, Calibration, Electric frequency control, Electric potential, Frequency synthesizers, Johnson noise thermometry, Josephson effect, Josephson junction arrays, Josephson junction devices, Microwave devices, Quantum voltage noise, Signal synthesis, Spurious signal noise, Standards, Superconducting devices, Superconducting microwave devices, Temperature measurement, Thermometers, Voltage control
AbstractWe describe our progress toward a high-precision measurement of temperature using Johnson noise. Using a quantized voltage noise source (QVNS) based on the Josephson effect as a calculable noise source, we have been able to measure the ratio of the gallium and water triple-point temperatures to within an accuracy better than 100 μK/K. We also describe the operation of our Johnson noise thermometry system that could be used as a primary thermometer and possible sources of error that limit our absolute temperature measurements to ∼ 150 μK/K. © 2005 IEEE.

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