2022/10/05 by Dong-Hun Chae, Mun-Seog Kim, Takehiko Oe +2 · 1 citation
Engineering · Physics and Astronomy · #Advanced Electrical Measurement Techniques #Mechanical and Optical Resonators #Quantum and electron transport phenomena
paper · doi:10.1088/1681-7575/ac97a0
openalex publication_date 2022/10/05 · crossref created 2022/10/05 · crossref issued 2022/11/14 · crossref published 2022/11/14 · crossref published-online 2022/11/14 · crossref published-print 2022/12/01 · openalex created_date 2025/10/10 · crossref deposited 2025/10/18 · crossref indexed 2026/07/30 · openalex updated_date 2026/08/01
Abstract An accurate current can be realized by a series connection of an invariant voltage and resistance with zero interconnection resistance in the framework of Ohm’s law. In practice, however, accurate current realization is limited by the temporal drift and instability of employed resistors, solid-state voltage sources and interconnection wires against environmental fluctuations, such as temperature or atmospheric pressure. Here, we generated a current of 1 μA, determined by the Josephson voltage and quantized Hall resistance array (QHRA). A programmable Josephson voltage standard (PJVS), 1 MΩ QHRA and ultrastable low noise current amplifier (ULCA) are connected in series to generate and measure a current of 1 μA. The expected current is calculated as the ratio of the Josephson voltage to the QHRA plus the output resistance of the PJVS. The relative difference between the current measured by the ULCA and the calculated current is as small as 40 nA A −1 with a combined measurement uncertainty ( k = 1) of 0.13 μA A −1 .