English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

A silicon electron pump operating at the temperature of liquid helium hasdemonstrated repeatable operation with sub-ppm accuracy. The pump current,approximately 168 pA, is measured by three laboratories, and the measurementsagree with the expected current ef within the uncertainties which range from0.2 ppm to 1.3 ppm. All the measurements are carried out in zero appliedmagnetic field, and the pump drive signal is a sine wave. The combination ofsimple operating conditions with high accuracy demonstrates the possibilitythat an electron pump can operate as a current standard in a NationalMeasurement Institute. We also discuss other practical aspects of using theelectron pump as a current standard, such as testing its robustness to changesin the control parameters, and using a rapid tuning procedure to locate theoptimal operation point..

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