Realisation of a quantum current standard at liquid helium temperature with sub-ppm reproducibility

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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2020-04
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Mcode
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Language
en
Pages
8
Series
Metrologia, Volume 57, issue 2
Abstract
A silicon electron pump operating at the temperature of liquid helium has demonstrated repeatable operation with sub-ppm accuracy. The pump current, approximately 168 pA, is measured by three laboratories, and the measurements agree with the expected current ef within the uncertainties which range from 0.2 ppm to 1.3 ppm. All the measurements are carried out in zero applied magnetic field, and the pump drive signal is a sine wave. The combination of simple operating conditions with high accuracy demonstrates the possibility that an electron pump can operate as a current standard in a National Measurement Institute. We also discuss other practical aspects of using the electron pump as a current standard, such as testing its robustness to changes in the control parameters, and using a rapid tuning procedure to locate the optimal operation point.
Description
Mate Jenein mukaan kyseessä on post-print. Kysytty erikseen.
Keywords
electron pump, quantised charge pumping, SI base units
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Citation
Giblin , S , Mykkanen , E , Kemppinen , A , Immonen , P , Manninen , A , Jenei , M , Mottonen , M , Yamahata , G , Fujiwara , A & Kataoka , M 2020 , ' Realisation of a quantum current standard at liquid helium temperature with sub-ppm reproducibility ' , Metrologia , vol. 57 , no. 2 , 025013 . https://doi.org/10.1088/1681-7575/ab72e0