A 1.4 mil2memory cell with Josephson junctions

An integrated loop-memory cell with miniaturized Josephson-junction dimensions (∼5 × 5 μm²) and very high Josephson current density (30 kA/cm²) has been made in a 2 μm-minimum line-width lead-alloy technology. The storage currents are easily set up with coincident word and digit pulses. Nondestructive read-out, write and half selection has been successfully performed. The deduced current transfer time during write is below about 80 ps.