Low-frequency noise in low 1/f noise dc SQUID’s

Foglietti, V.; Gallagher, W. J.; Ketchen, M. B.; Kleinsasser, A. W.; Koch, R. H.; Raider, S. I.; Sandstrom, R. L.
November 1986
Applied Physics Letters;11/17/1986, Vol. 49 Issue 20, p1393
Academic Journal
We demonstrate that the low-frequency noise in our edge junction dc superconducting quantum interference devices, with a basic 1/f flux noise of 2×10-12 [uppercase_phi_synonym]20/Hz at 1 Hz, can all be accounted for in terms of junction critical current fluctuations. A novel modulation readout scheme is able to cancel the effect of junction critical current fluctuations and reduce our total noise to 1×10-12 [uppercase_phi_synonym]20/Hz at 0.1 Hz, a level that is three times lower than the lowest flux noise ever previously reported at this frequency.


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