Model for 1/f Flux noise in SQUIDs and Qubits.
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 5x10(17) m(-2) yield 1/f noise magnitudes in good agreement with experiments.
IBM Research Division, Thomas J. Watson Research Center, Yorktown Heights, New York 10598, USA.
Roger H
RH
Koch
David P
DP
Divincenzo
John
J
Clarke