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We precisely evaluated a single-chip 10-V programmable Josephson voltage standard (PJVS) system based on a closed-cycle refrigerator by directly comparing it with a conventional Josephson voltage standard system. The PJVS chip fabricated using NbN/TiNx/NbN junction technology was used. The result of the measurement showed a good agreement with a combined standard uncertainty of 3.1 parts in 1010 at...
We tried a direct comparison between a 1-V NbN-based programmable superconductor-normal metal-superconductor (SNS) Josephson array and a conventional superconductor-insulator-superconductor (SIS) Josephson array. In preliminary experiment the voltage difference of the two arrays was -4.3 times 10-9 V in average of 10 measurement sets. The deviation is resulted from the fluctuations of the background...
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