Title :
Reduction of telegraph noise in superconducting short weak links
Author :
Ohta, H. ; Matsui, T. ; Shinada, K. ; Yamada, Y. ; Munaka, T. ; Fujiyama, Y.
Author_Institution :
RIKEN, Inst. of Phys. & Chem. Res., Saitama, Japan
fDate :
6/1/1995 12:00:00 AM
Abstract :
It has been proved that, in the large channel number limit, the Josephson current of short weak links derived with a quantum mechanical scattering theory is analytically equal to the Josephson current derived with a classical transport equation in the dirty limit. It means that the former expression of the Josephson current can explain temperature dependence of the maximum critical current of short weak links in the dirty limit as well as in the clean and tunnel limits. The proved generality of the expression of the Josephson current helped us find a reproducible method to reduce telegraph noise in devices of short weak links and get a 130-channel dc-SQUID system.<>
Keywords :
SQUIDs; superconducting device noise; superconducting junction devices; Josephson current; classical transport equation; clean limit; critical current; dirty limit; multichannel DC-SQUID; quantum mechanical scattering; superconducting short weak links; telegraph noise; tunnel limit; Chemical analysis; Critical current; Equations; Josephson effect; Josephson junctions; Noise reduction; Superconducting device noise; Superconducting devices; Telegraphy; Temperature dependence;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
