• planqtn.com: PlanqTN Studio
• planqtn on Pypi: the official PlanqTN Python library
• planqtn.com/docs: Documentation for both PlanqTN Studio and the Python library

Welcome to PlanqTN!

PlanqTN is the planqtn python library and the PlanqTN Studio (https://planqtn.com), an interactive studio to create, manipulate and analyze tensor network-based quantum error correcting codes.

The name is a triple entendre on Planck, quantum and Tensor Networks (TN). It is pronounced "plankton", and was inspired by the fact that each of the little tensors look like a unique plankter. Also, while we love the quantum LEGO name, we did not want to get into trademark problems.

The features are an implementation of the quantum LEGO framework by Charles Cao and Brad Lackey and the quantum LEGO expansion pack: enumerators from tensor networks by Cao, Gullans, Lackey and Wang, but we also integrate with features that automate tensor network contraction with Cotengra and take a unified approach to quantum LEGO, ZX-calculus and graph states. Check out the detailed list of PlanqTN features!

PlanqTN is open source under Apache 2.0 license and free for all, built with ❤️ by @balopat, June Vanlerberghe and hopefully a lot more future collaborators under the guiding council of Charles Cao, Brad Lackey, and Kenneth R. Brown. If building tools like this sounds like fun to you, please consider contributing!

We are supported by the Unitary Foundation.

Contributing

PlanqTN is an open source project and we would love to see contributions from you!

To chat: Find us on the #planqtn channel on the Unitary Foundation's discord server!

To get started with contributions, check out good first issues, and follow the DEVELOPMENT.md for setup, developer workflows, and design concepts.

Citing PlanqTN

Please use the following Zenodo citation to cite PlanqTN:

@software{pato_2025_16761072,
  author       = {Pato, Balint and
                  Vanlerberghe, June and
                  Cao, ChunJun and
                  Lackey, Brad and
                  Brown, Kenneth},
  title        = {PlanqTN, a Python library and interactive web app
                   implementing the quantum LEGO framework
                  },
  month        = aug,
  year         = 2025,
  publisher    = {Zenodo},
  doi          = {10.5281/zenodo.16761072},
  url          = {https://doi.org/10.5281/zenodo.16761072},
}

License

Copyright 2025 Balint Pato

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.