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

机译:具有亚ppm再现性液氦温度下量子电流标准的实现

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摘要

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.
机译:在液氦温度下操作的硅电子泵已经表现出具有亚ppm精度的可重复运行。 泵电流约为168Pa,由三个实验室测量,测量结果与不确定性内的预期电流EF一致,其范围为0.2ppm至1.3 ppm。 所有测量都在零施加的磁场中进行,泵驱动信号是正弦波。 简单操作条件具有高精度的组合表明电子泵可以作为国家测量研究所的当前标准操作的可能性。 我们还讨论使用电子泵作为当前标准的其他实际方面,例如测试其鲁棒性以对控制参数的变化,以及使用快速调整过程来定位最佳操作点。

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