Complementary Josephson Junction circuits

Abstract

We present simple Complementary Josephson Junction circuits using 1 kA/cm/sup 2/ Nb junctions. We use long, sine-shaped junctions in order to achieve gain and suppressed side lobes. We have simulated layout-extracted simple inverter and ring oscillator circuits to evaluate the performance of these circuits in 1 kA/cm/sup 2/ technology. Projected gate delays with possible higher critical current density technologies are also simulated. We have experimentally tested the operation of inverter circuits.