Microscopic origin of low frequency flux noise in Josephson circuits

Details Microscopic origin of low frequency flux noise in Josephson circuits Microscopic origin of low frequency flux noise in Josephson circuits

2007-12-17

arxiv.org/abs/0712.2834v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, no figures

Scientific paper

10.1103/PhysRevLett.100.227005

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 the superconductor insulator boundary whose dynamics is due to RKKY interaction. We show that this mechanism explains size independence of the noise, different frequency dependences of the spectra reported in large and small SQUIDs and gives the correct intensity for realistic parameters.

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