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Microscopic Origin of Low-Frequency Flux Noise in Josephson Circuits

Microscopic Origin of Low-Frequency Flux Noise in Josephson Circuits

We analyze the data and discuss their implications for the microscopic origin of the low-frequency flux noise in superconducting circuits. We argue that this noise is produced by spins at superconductor insulator boundary whose dynamics is due to RKKY interaction. We show that this mechanism explains size independence of the …