An experimental memory cell using edge-junction gates

We have fabricated and successfully operated NDRO memory cells designed with Nb edge-junction interferometers. To our knowledge this represents the first experimental circuits operated with edge-junction devices. The design was mapped from a design for lead-alloy devices. The cell occupies an area of 60μm ×60μm. In conjunction with the memory cell investigation we designed and tested several individual edge-junction gates. These included several geometries of write gates and sense gates (undamped), and several damped gates, which could be used in the peripheral circuitry of a memory. We have found close agreement between our experimental results and the theoretical models, similar to that found previously for planar-junction gates.