2 GHz下电子泵的精确测量
Precision measurement of an electron pump at 2 GHz
AI总结：
在2 GHz下运行硅可调势垒电子泵，通过盲测协议精确测量320 pA泵电流，发现0.2 ppm的ef偏移，揭示了现有低温电流比较器方法在小电流缩放精度上的局限。
摘要：
使用定制驱动波形，在2 GHz频率下运行了特性良好的硅可调势垒电子泵样品，产生320 pA的泵电流。在为期7周的测量活动中，采用盲测协议，对电流作为泵控制参数的函数进行了精确测量。每10小时测量的综合标准不确定度为0.1 ppm。泵电流在出口栅极电压上表现出平台，平坦度约为0.1 ppm，但偏离ef 0.2 ppm。该偏移可能是电流溯源链中误差的迹象，表明基于低温电流比较器的现有方法在实现小电流缩放精度方面存在局限。
英文摘要：
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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