PennyLane is a cross-platform Python library for differentiable programming of quantum computers.

Train a quantum computer the same way as a neural network.

PennyLane provides open-source tools for quantum machine learning, quantum computing, quantum chemistry, and hybrid quantum-classical computing. Extensive examples, tutorials, and demos are available at https://pennylane.ai/qml.

• Device independent. Access quantum hardware and simulators from Xanadu Strawberry Fields, IBM Q, Google Cirq, Rigetti Forest, and Microsoft QDK.
• Best of both worlds. Build hybrid models by connecting quantum hardware to PyTorch, TensorFlow, Keras, and NumPy.
• Follow the gradient. Hardware-friendly automatic differentiation of quantum circuits.
• Batteries included. Built-in tools for quantum machine learning, optimization, and quantum chemistry.

For an introduction to quantum machine learning, we have several guides and resources available on PennyLane's quantum machine learning page:

• What is quantum machine learning?
• QML tutorials and demonstrations
• Frequently asked questions
• Glossary of key concepts
• Curated selection of QML videos

You can also check out our documentation for quickstart guides to using PennyLane, and detailed developer guides on how to write your own PennyLane-compatible quantum device.

• PennyLane-SF: Supports integration with Strawberry Fields, a full-stack Python library for simulating photonic quantum computing.
• PennyLane-qiskit: Supports integration with Qiskit, an open-source quantum computation framework by IBM. Provides device support for the Qiskit Aer quantum simulators, and IBM Q hardware devices.
• PennyLane-cirq: Supports integration with Cirq, an open-source quantum computation framework by Google.
• PennyLane-Forest: Supports integration with PyQuil, the Rigetti Forest SDK, and the Rigetti QCS, an open-source quantum computation framework by Rigetti. Provides device support for the the Quantum Virtual Machine (QVM) and Quantum Processing Units (QPUs) hardware devices.
• PennyLane-Qsharp: Supports integration with the Microsoft Quantum Development Kit, a quantum computation framework that uses the Q# quantum programming language.

For a full list of PennyLane plugins, see the PennyLane website.

PennyLane requires Python version 3.6 and above. Installation of PennyLane, as well as all dependencies, can be done using pip:

$ python -m pip install pennylane

We welcome contributions — simply fork the PennyLane repository, and then make a pull request containing your contribution. All contributers to PennyLane will be listed as authors on the releases. All users who contribute significantly to the code (new plugins, new functionality, etc.) will be listed on the PennyLane arXiv paper.

We also encourage bug reports, suggestions for new features and enhancements, and even links to cool projects or applications built on PennyLane.

See our contributions page for more details.

PennyLane is the work of many contributors.

If you are doing research using PennyLane, please cite our paper:

Ville Bergholm, Josh Izaac, Maria Schuld, Christian Gogolin, M. Sohaib Alam, Shahnawaz Ahmed, Juan Miguel Arrazola, Carsten Blank, Alain Delgado, Soran Jahangiri, Keri McKiernan, Johannes Jakob Meyer, Zeyue Niu, Antal Száva, and Nathan Killoran. PennyLane: Automatic differentiation of hybrid quantum-classical computations. 2018. arXiv:1811.04968

• Source Code: https://github.com/PennyLaneAI/pennylane
• Issue Tracker: https://github.com/PennyLaneAI/pennylane/issues

If you are having issues, please let us know by posting the issue on our Github issue tracker.

We also have a PennyLane discussion forum - come join the discussion and chat with our PennyLane team.

PennyLane is free and open source, released under the Apache License, Version 2.0.