Effects of Spread in Critical Currents for Series- and Parallel-Coupled Arrays of SQUIDs and Bi-SQUIDs

Abstract

High-temperature-superconductor (HTS) superconducting quantum interference devices (SQUIDs) have a much greater variance in the values of the critical currents than their low-temperature-superconductor counterparts. To explore the effects of this increased variance, we add a noise term into the critical current of each junction. We perform numerical simulations of previously derived phase equations from series- and parallel-coupled arrays of SQUIDs, and series-and parallel-coupled arrays of bi-SQUIDs. These results support ongoing work to design an electrically small magnetic field antenna and low-noise amplifier with high bandwidth using HTS SQUIDs.