SINGLE FLUX QUANTUM STORAGE DEVICES AND SENSING MEANS THEREFOR

摘要

An information storage device which stores a single flux quantum without bias is disclosed. The device includes a single Josephson tunneling device made from two superconductive materials spaced apart by an insulator wherein a Josephson current density profile J1(x) defined by + INFINITY J1(x) =J1(x,y)dy - INFINITY IS CHARACTERIZED SUCH THAT THE PROFILE HAS A LARGER MAGNITUDE AT THE BOUNDARY PORTIONS OF SAID DEVICE THAN AT THE CENTER. The current density profile is controlled by adjusting either the oxide thicknesses, the work function of the superconductors or by changing the shape of the junction from its usual rectangular cross-section.