Modeling Flux Noise in SQUIDs Due to Hyperfine Interactions

Abstract

Recent experiments implicate spins on the surface of metals as the source of flux noise in SQUIDs, and indicate that these spins are able to relax without conserving total magnetization. We present a model of $1/f$ flux noise in which electron spins on the surface of metals can relax via hyperfine interactions. Our results indicate that flux noise would be significantly reduced in superconducting materials where the most abundant isotopes do not have nuclear moments such as zinc and lead.

4+ pages, no figures

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Cited by in corpus (6)

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• Flux-vector model of spin noise in superconducting circuits: Electron versus nuclear spins and role of phase transition
• Hydrogen as a Source of Flux Noise in SQUIDs
• Protecting Superconducting Qubits with Universal Quantum Degeneracy Point