Process#

QPDK describes a generic superconducting process in two files: the layers and their GDS numbers in qpdk/layers.yaml, and their physical stack, materials and cross-sections in qpdk/tech.py. Cells draw on those layers, the field solvers extrude the stack, and the DRC deck enforces its geometry.

LAYER STACK a section through the films silicon Nb Al/AlOx junction niobium M1 films, materials, thicknesses, GDS layers DESIGN RULES the same films as masks, from above ground signal ground 𝑤 𝑠 mask model, rules, profiles, intent

Two pages cover the process:

  • Layer stack: every level of the base, flip-chip, backside and gatemon stacks, with its material, thickness, height and GDS layer.

  • Design rules: the subtractive mask model, the rules the deck runs, the rule profiles, and the intent layers that coupled cells emit.

To change the stack, the materials or the rules for your own fab, see Customizing QPDK for Your Process.