Josephson logic circuits based on nonlinear current injection in interferometer devices

Abstract

Nonlinear current‐injection switching of Josephson interferometer devices is achieved by current injection into an asymmetric feedpoint. This method of switching interferometers has two important features: higher gain than in previous approaches and a novel nonlinear threshold curve which is of practical interest. A new family of high‐performance logic gates based on nonlinear current injection is described. Logic circuits have been experimentally tested and preliminary results are presented.