Microscopic Origin of Low-Frequency Flux Noise in Josephson Circuits

Lara Faoro and Lev B. Ioffe
Phys. Rev. Lett. 100, 227005 – Published 5 June 2008

Abstract

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 noise, different frequency dependences of the spectra reported in large and small SQUIDs, and gives the correct intensity for realistic parameters.

  • Received 17 December 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.227005

©2008 American Physical Society

Authors & Affiliations

Lara Faoro and Lev B. Ioffe

  • Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway 08854, New Jersey, USA

See Also

Magnetism in SQUIDs at Millikelvin Temperatures

S. Sendelbach, D. Hover, A. Kittel, M. Mück, John M. Martinis, and R. McDermott
Phys. Rev. Lett. 100, 227006 (2008)

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Issue

Vol. 100, Iss. 22 — 6 June 2008

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