Noise properties of SQUIDs with step-edge Josephson junctions

The authors investigated low-frequency noise in RF and DC superconducting quantum interference devices (SQUIDs) with step-edge Josephson junctions (SEJs). The noise properties have been measured as a function of frequency, temperature, bias current, and magnetic field. The low-frequency noise has a...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 1993-03, Vol.3 (1), p.2472-2476
Main Authors: Glyantsev, V.N., Siegel, M., Schubert, J., Zander, W., Poppe, U., Soltner, H., Braginski, A.I., Heiden, C.
Format: Article
Language:English
Subjects:
Applied sciences
Electronics
Exact sciences and technology
Josephson junctions
Low-frequency noise
Magnetic field measurement
Magnetic noise
Magnetic properties
Radio frequency
Radiofrequency interference
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
SQUIDs
Superconducting device noise
Superconducting devices
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Summary:The authors investigated low-frequency noise in RF and DC superconducting quantum interference devices (SQUIDs) with step-edge Josephson junctions (SEJs). The noise properties have been measured as a function of frequency, temperature, bias current, and magnetic field. The low-frequency noise has a telegraph-like character in certain conditions and depends quasi-periodically on flux and temperature. This telegraph noise was also observed in single step-edge junctions. The experimental results were explained by a model of such a junction in which an array of parallel and series connected weak links acts like a two-level fluctuator. This fluctuator arises from the quantum states of a multijunction SQUID with spatially inhomogeneous SEJs resembling a multijunction array.< >
ISSN:1051-8223
1558-2515
DOI:10.1109/77.233957