API Reference

The public API is organized below by module area, mirroring the package's source layout (src/State/, src/Gates/, src/Geometry/, src/Observables/, src/Circuit/, src/Core/rng.jl). Every exported name appears in exactly one section. Backend-specific implementation notes (which methods exist per backend, which fall through to an MPS-assumed generic, RNG stream obligations) live in the Backend Interface Contract developer page, not here.

• States and Backends — SimulationState, initialization, event log, GaussianBackend
• Gates — unitaries, measurements, projections, spin-sector machinery
• Geometry — site-selection vocabulary (broadcast vs. set geometries)
• Observables — callable-struct observables, tracking, catalog
• Circuit — lazy do-block builder, expansion, simulation
• Random Number Generation — reproducible, independently-seeded RNG streams

Developer Documentation

• Backend Interface Contract — the contract a new backend (AbstractBackend subtype) must satisfy: required methods, RNG stream rules, indexing conventions.
• Custom Observables — the track!-any-callable contract, public building blocks, and three worked examples (closure, composed struct, record_value-hook override).
• Private / Internal API — unexported names with docstrings, for contributors reading or extending the source.