SQUID read-out over a Josephson junction array

Nadav Shaibe, Brad R. Trees

Marian Darula, P. Seidel, F. H. Busse +1 more

The dynamic properties of a superconducting quantum interference device (SQUID) containing arrays of Josephson junctions in a superconducting loop, and in particular the case of a four-junction SQUID, is analyzed theoretically via computer simulations. It is shown that phase locking of Josephson junctions determines the dynamic behavior of the SQUID. In the case of a stable phase-lock state hysteretic I-V curves as well as unusual voltage-flux dependencies appear. The influence of a small spread in the Josephson junction parameters upon the stability of the phase-lock state is investigated in parameter space.

Heinz Jäckel

Hideaki Takayanagi, Hirotaka Tanaka, Shiro Saito +1 more

M. P. Chetaev, V. I. Shnyrkov

Differential resistance oscillations in a voltage-biased chain of Josephson junctions, as a result of microwave signals, indicate possible use of such a chain as a radiation detector. The properties and possible use in a squid of a three-dimensional array of Josephson junctions, with suitable parameters, are studied in the present work.

Ralf Wunderlich, J. Langer, B. Meyer +1 more