Variable threshold logic with superconducting quantum interferometers

This paper proposes a two-junction interferometer called Variable Threshold Logic. It has both magnetically-coupled control-lines and current-injection terminals. The threshold curve of this gate can be shifted by the applied currents. This property enables its use for both OR and AND function with the same structure by only changing the wiring. Operating margins of ±12 % for OR and ± 29 % for AND are obtained with the optimized device parameters. Any logic circuit can be obtained by Josephson master-slice LSI of this gate with a dual-rail logic system.