REDUCTION OF TELEGRAPH NOISE IN SUPERCONDUCTING SHORT WEAK LINKS

It has been proved that, in the large channel number limit, the Joseph son current of short weak links derived with a quantum mechanical scat tering theory is analytically equal to the Josephson current derived w ith a classical transport equation in the dirty limit. It means that t he 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 gene rality of the expression of the Josephson current helped us find a rep roducible method to reduce telegraph noise in devices of short weak li nks and get a 130-channel dc-SQUID system.