Juliacon 2024

Layout.jl is a package developed at the AWS Center for Quantum Computing for computer-aided design (CAD) of quantum hardware—specifically, for superconducting integrated circuits operating at microwave frequency. The package supports the generation of 2D layouts and 3D models of complex devices using a low-level geometry interface together with a high-level schematic-driven workflow. At the geometry level, the user writes code to draw 2D geometric entities like polygons and paths, optionally using units with Unitful.jl; position and orient these entities with coordinate transformations; organize them into a hierarchy of local coordinate systems and references; apply operations like rounding, offsetting, or geometric Booleans; and assign each entity metadata that can be used in different ways by different backends. In the schematic-driven workflow, the user defines components and the connectivity between them, followed by automated placement and routing with the schematic API to construct a layout. The results can be rendered with various backends, including for output in the GDSII format; used to construct and mesh a 3D model; and interfaced with other tools like the open-source electromagnetics solver Palace. Finally, we leverage the Julia package manager for process design kit (PDK) management, allowing users to maintain a library of versioned process technologies and components for portable, reproducible layout scripts.