MQT Core - The Backbone of the Munich Quantum Toolkit (MQT)

MQT Core is an open-source C++20 and Python library for quantum computing that forms the backbone of the quantum software tools developed as part of the Munich Quantum Toolkit (MQT).

Key Features

Fully fledged intermediate representation (IR) for quantum computations.
A state-of-the-art decision diagram (DD) package for quantum computing.
A dedicated ZX-diagram package for working with the ZX-calculus.
A QIR runtime based on the decision diagram package.

If you have any questions, feel free to create a discussion or an issue on GitHub.

Contributors and Supporters

MQT Core is developed by the Chair for Design Automation at the Technical University of Munich and MQSC. Among others, it is part of the Munich Quantum Software Stack (MQSS) ecosystem, which is being developed as part of the Munich Quantum Valley (MQV) initiative.

MQT Partner Logos

Thank you to all the contributors who have helped make MQT Core a reality!

The MQT will remain free, open-source, and permissively licensed — now and in the future. We are firmly committed to keeping it open and actively maintained for the quantum computing community.

To support this endeavor, please consider:

Starring and sharing our repositories: https://github.com/munich-quantum-toolkit
Contributing code, documentation, tests, or examples via issues and pull requests
Citing the MQT in your publications (see Cite This)
Citing our research in your publications (see References)
Using the MQT in research and teaching, and sharing feedback and use cases
Sponsoring us on GitHub: https://github.com/sponsors/munich-quantum-toolkit

Getting Started

mqt.core is available via PyPI.

uv pip install mqt.core

The following code gives an example on the usage:

from mqt.core.ir import QuantumComputation

qc = QuantumComputation(2, 2)
qc.h(0)
qc.cx(0, 1)
qc.measure(range(2), range(2))

print(qc)

Detailed documentation and examples are available at ReadTheDocs.

System Requirements

Building the project requires a C++ compiler with support for C++20 and CMake 3.24 or newer. For details on how to build the project, please refer to the documentation. Building (and running) is continuously tested under Linux, macOS, and Windows using the latest available system versions for GitHub Actions. MQT Core is compatible with all officially supported Python versions.

The project relies on some external dependencies:

boost/multiprecision: A library for multiprecision arithmetic (used in the ZX package).
nlohmann/json: A JSON library for modern C++.
google/googletest: A testing framework for C++ (only used in tests).

CMake will automatically look for installed versions of these libraries. If it does not find them, they will be fetched automatically at configure time via the FetchContent module (check out the documentation for more information on how to customize this behavior).

It is recommended (although not required) to have GraphViz installed for visualization purposes.

If you want to use the ZX library, it is recommended (although not strictly necessary) to have GMP installed in your system.

Cite This

Please cite the work that best fits your use case.

MQT Core (the tool)

When citing the software itself or results produced with it, cite the MQT Core paper:

@article{burgholzer2025MQTCore,
  title        = {{{MQT Core}}: {{The}} Backbone of the {{Munich Quantum Toolkit (MQT)}}},
  author       = {Burgholzer, Lukas and Stade, Yannick and Peham, Tom and Wille, Robert},
  year         = 2025,
  journal      = {Journal of Open Source Software},
  publisher    = {The Open Journal},
  volume       = 10,
  number       = 108,
  pages        = 7478,
  doi          = {10.21105/joss.07478},
  url          = {https://doi.org/10.21105/joss.07478}
}

The Munich Quantum Toolkit (the project)

When discussing the overall MQT project or its ecosystem, cite the MQT Handbook:

@inproceedings{mqt,
  title        = {The {{MQT}} Handbook: {{A}} Summary of Design Automation Tools and Software for Quantum Computing},
  shorttitle   = {{The MQT Handbook}},
  author       = {Wille, Robert and Berent, Lucas and Forster, Tobias and Kunasaikaran, Jagatheesan and Mato, Kevin and Peham, Tom and Quetschlich, Nils and Rovara, Damian and Sander, Aaron and Schmid, Ludwig and Schoenberger, Daniel and Stade, Yannick and Burgholzer, Lukas},
  year         = 2024,
  booktitle    = {IEEE International Conference on Quantum Software (QSW)},
  doi          = {10.1109/QSW62656.2024.00013},
  eprint       = {2405.17543},
  eprinttype   = {arxiv},
  addendum     = {A live version of this document is available at \url{https://mqt.readthedocs.io}}
}

Acknowledgements

The Munich Quantum Toolkit has been supported by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (grant agreement No. 101001318), the Bavarian State Ministry for Science and Arts through the Distinguished Professorship Program, as well as the Munich Quantum Valley, which is supported by the Bavarian state government with funds from the Hightech Agenda Bayern Plus.

MQT Funding Footer

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mqt-core 3.8.0

MQT Core - The Backbone of the Munich Quantum Toolkit (MQT)

Key Features

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MQT Core (the tool)

The Munich Quantum Toolkit (the project)

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