Noise properties of SQUIDs with step-edge Josephson junctions

Author

Glyantsev, V.N. ; Siegel, M. ; Schubert, J. ; Zander, W. ; Poppe, Ulrich ; Soltner, H. ; Braginski, A.I. ; Heiden, C.

Author_Institution

Inst. fur Schicht- und Ionentechnik, Forschungszentrum Julich, Germany

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

2472

Lastpage

2476

Abstract

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.<>

Keywords

Josephson effect; SQUIDs; electron device noise; DC type; RF type; SQUIDs; bias current; low-frequency noise; magnetic field; model; noise properties; step-edge Josephson junctions; superconducting quantum interference devices; telegraph-like character; temperature; two-level fluctuator; weak links; Josephson junctions; Low-frequency noise; Magnetic field measurement; Magnetic noise; Magnetic properties; Radio frequency; Radiofrequency interference; SQUIDs; Superconducting device noise; Superconducting devices;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233957

Filename

233957