Model for l/f Flux Noise in SQUIDs and Qubits

Abstract

We propose a model for 1/f flux noise in superconducting devices (f is frequency). The noise is generated by the magnetic moments of electrons in defect states which they occupy for a wide distribution of times before escaping. A trapped electron occupies one of the two Kramers-degenerate ground states, between which the transition rate is negligible at low temperature. As a result, the magnetic moment orientation is locked. Simulations of the noise produced by randomly oriented defects with a density of 5*10^17 m^-2 yield 1/f noise magnitudes in good agreement with experiments.

arXiv comment16 pages, 4 figures; v2: Various minor changes. Physical Review Letters, in press

References in corpus (2)

• Decoherence in Josephson Qubits from Dielectric Loss
• Decoherence of flux qubits due to 1/f flux noise

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