QuTiP - Quantum Toolbox in Python

The open-source software for simulating quantum systems from quantum optics and quantum computing to open-system dynamics.
Are you using QuTiP in your personal projects or research? We'd love to hear from you! Take our 2026 User Survey now! (~5 minutes).
QuTiP at 2026 RIKEN-NCHU Summer School September, 2026
QuTiP at EuroSciPy 2026 August, 2026
QuTiP at 2026 NEDOQS Summer School July, 2026
QuTiP Workshop 2026 March, 2026
QuTiP is more than just a Python package. Check out all the related projects!
The QuTiP quantum information processing package
A pure Julia implementation of QuTiP and more
The package for Quantum Optimal Control (alpha)
JAX linear algebra backend for QuTiP (experimental)
The package for NVIDIA cuQuantum integration (experimental)
QuTiP is used to advance research in quantum optics, quantum information, quantum open systems, opto­mechanics, and many related fields. QuTiP is in use at nearly all research universities around the globe, government-funded research labs, and is relied upon by most major corporation developing a quantum computer.
QuTiP is used around the globe, and has been downloaded over a million times since its initial release. Need help in simulating a tricky problem? Our large community of users are happy to help in tackling even the most esoteric of issues.
Developers from Nori's Lab, Blais' Lab and Yueh-Nan Chen's group have been actively contributing to QuTiP.
QuTiP is proud to be working with these organizations:
QuTiP is happy to acknowledge Zulip for providing a free chat service for open-source projects:
We also thank Google for their support through the Google Summer of Code program. Look at our past projects.
Consider sponsoring to support its development.
© 2011 to inclusive, QuTiP admins and contributors.