Open-source quantum control kernel. Hamiltonian in, optimized pulses out.

QubitOS sits between the compiler and quantum hardware. It optimizes control pulses against live calibration data, schedules them with constraint-aware parallelism, and dispatches through a hardware abstraction layer.

Apache License 2.0. Python 3.11+. Rust 1.85+.

QubitOS is a monorepo at qubit-os/qubit-os:

core/    Python: GRAPE optimizer, SME solver, calibration, CLI
hal/     Rust: gRPC server, backend dispatch, Lindblad and SME solvers
proto/   Protocol Buffer API contracts

The previous split repositories (qubit-os-core, qubit-os-hardware, qubit-os-proto) are archived and redirect to the monorepo.

v0.6.0 (2026-05-16). Stochastic master equation solver landed: Itô SDE integrator, Monte Carlo ensemble with Rayon parallelism, validation against QuTiP smesolve, agentbible-backed numerical decoration on the conditional density matrix surface.

See the release notes and ROADMAP.txt for the active milestone plan.

IQM is the primary live integration and the only backend exercised against real hardware. IBM Quantum, AWS Braket, and the QuTiP simulator are mock-tested and demonstrate the backend abstraction; they are not maintained as production cloud integrations.

Documentation:  https://qubit-os.github.io/qubit-os/
Contributing:   https://github.com/qubit-os/qubit-os/blob/main/CONTRIBUTING.txt
Agent contract: https://github.com/qubit-os/qubit-os/blob/main/AGENTS.txt