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Research on Margin Parameters Measurement System for Programmable Josephson Junction Arrays

In the programmable Josephson voltage standard (PJVS) system, fast and accurate measurement of the margin parameters of each sub-array is a prerequisite for achieving a reliable drive of the programmable Josephson junction arrays (PJJAs) to output a stable quantum voltage. This paper studied a margin parameters measurement system for PJJAs. It consists of LabVIEW-based measurement and control software (MCS), microwave drive source, multi-channel bias current source (MCBCS), and digital voltmeter (DVM). Among them, the self-developed MCBCS is based on the V-I conversion principle. With a designed resolution of less than 5 µA and a maximum output capacity of more than ±30 mA, it can meet the requirements for simultaneous measurement of up to 23 sub-arrays. In addition, this paper proposed a measurement and control strategy to quickly extract the characteristic points of the I-V characteristic curve for enhancing the efficiency of margin parameters measure-ment. The contrast experiment results showed that this system can effectively measure the margin parameters of the PJJAs.