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..
@article{arxiv.1912.02042,
title = {Realisation of a quantum current standard at liquid helium temperature with sub-ppm reproducibility},
author = {Stephen Giblin and Emma Mykkänen and Antti Kemppinen and Pekka Immonen and Antti Manninen and Máté Jenei and Mikko Möttönen and Gento Yamahata and Akira Fujiwara and Masaya Kataoka},
journal= {arXiv preprint arXiv:1912.02042},
year = {2020}
}
Comments
7 pages, 5 figures plus an additional 6 pages with 6 figures of supplementary information