脉冲驱动型交流约瑟夫森电压标准通过高速脉冲序列驱动约瑟夫森结阵,具有频谱纯净、频带宽等优点.可编程约瑟夫森电压标准通过偏置电流驱动约瑟夫森结阵,输出幅值大,但合成频率低且含有高次谐波分量.文章基于差分采样技术开展了两套交流量子电压系统的比对验证.实验验证了频率为50 Hz、62.5 Hz、100 Hz,有效值为0.75 V的交流量子电压一致性,并评估了采样器增益、采样器频率响应、传输线修正以及感应电压与串扰对差分采样结果的影响.比对结果表明两套量子电压系统在频率50 Hz、62.5 Hz、100 Hz,有效值0.75 V 条件下的一致性分别为(0.025±0.320)μV/V、(0.005±0.124)μV/V、(0.150±0.215)μV/V.文章的研究工作可以为国际计量局建议的BIPM.EM-K10比对提供技术基础.
Direct comparison of pulse-driven and programmable AC Josephson voltage standards
The pulse-driven AC Josephson voltage standard(ACJVS)uses high-speed pulse sequences to drive a Jo-sephson junction array,offering advantages such as spectral purity and wide bandwidth.The programmable Josephson voltage standard(PJVS),driven by a bias current,provides higher output amplitude but lower synthesis frequencies and higher-order harmonics.This paper presents a comparison of two AC quantum voltage systems using differential sampling techniques.The experiment verifies the consistency of AC quantum voltages at 50 Hz,62.5 Hz,and 100 Hz under 0.75 V,and assesses the impact of sampler gain,frequency response,transmission line corrections,induced voltage,and crosstalk on the results.Comparison results indicate that the consistency between the two quantum voltage systems under the conditions of 50 Hz,62.5 Hz,and 100 Hz frequencies with RMS amplitude of 0.75 V are(0.025±0.320)μV/V,(0.005±0.124)μV/V,and(0.150±0.215)μV/V,respectively.The research provide a technical foundation for the BIPM.EM-K10 comparison recommended by the International Bureau of Weights and Measures(BIPM).
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