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Fabrication Process and Properties of Fully-Planarized Deep-Submicron Nb/Al– $\hbox{AlO}_{\rm x}\hbox{/Nb} $ Josephson Junctions for VLSI Circuits
A fabrication process for Nb/Al-AlO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> /Nb Josephson junctions (JJs) with sizes down to 200 nm has been developed on a 200-mm-wafer tool set typical for CMOS foundry. This process is the core of several nodes of a roadmap for fully-planarized fabrication processes for superconductor integrated circuits with …