A Full-Custom Design Flow and a Top-Down RTL-to-GDS Flow for Adiabatic Quantum-Flux-Parametron Logic Using a Commercial EDA Design Suite

Self- and Mutual Inductance of NbN and Bilayer NbN/Nb Inductors in a Planarized Fabrication Process With Nb Ground Planes

“…For instance, the SFQ cell library developed recently under the IARPA Supertools program [11] has device number density of only 5•10 5 Josephson junctions (JJs) per cm 2 , i.e., a factor of 30 lower than what the fabrication technology is capable to provide [12], [13]. The existing cell libraries of superconductor adiabatic circuits based on Adiabatic Quantum Flux Parametrons (AQFP) provide similarly low device number densities: about 4.8 •10 5 JJs/cm 2 [14], [15] for the SFQ5ee fabrication process at MIT LL [16], [17]; and about 1.6•10 5 JJs/cm 2 [18], [19] for the fabrication process developed at AIST, Japan. These device densities are almost five orders of magnitude lower than those in CMOS circuits.…”