Coherent characteristics of superconducting closed loop composed of Josephson junctions
Tadayuki Kobayashi, Nobuyoshi Kondo, Katsuyoshi Hamasaki +1 more
Abstract When the impedance of a Josephson junction is too low, the elements are connected in series. We connected two arrays with N series elements of Josephson junctions each (denoted 2N‐JJ loop) and tried to find conditions for it to operate coherently by investigating voltage‐current curves. the computer simulation showed that coherent operation is easier with this circuit than with a series connection of the elements when the elements have different junction parameters. Pb‐alloy tunnel‐type junctions were produced which have N = 2 and 3, and we found that voltage steps generated by application of rf current with frequency F have a voltige interval corresponding to NF. This agrees with the simulation results and indicates coherent operation.
Electronics and Communications in Japan (Part I Communications)•Jan 1, 1983•1 citation