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arXiv · 2301.04499

Precision measurement of an electron pump at 2 GHz

Stephen Giblin·Gento Yamahata·Akira Fujiwara·Masaya Kataoka
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Abstract

A well-characterised sample of silicon tunable-barrier electron pump has been operated at a frequency of 2 GHz using a custom drive waveform, generating a pump current of 320 pA. Precision measurements of the current were made as a function of pump control parameters, using a blind protocol, over a 7-week campaign. The combined standard uncertainty for each 10 hour measurement was 0.1 parts per million. The pump current exhibits a plateau along the exit gate voltage flat to approximately 0.1 parts per million, but offset from ef by 0.2 parts per million. This offset may be a sign of errors in the current traceability chain, indicating a limit to the accuracy of small current scaling using existing methods based on cryogenic current comparators.

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Stephen Giblin, Gento Yamahata, Akira Fujiwara, Masaya Kataoka. 2023-01-11. Precision measurement of an electron pump at 2 GHz. https://doi.org/10.1088/1681-7575/ace054

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