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@quantumlib

Quantumlib

Quantum AI's open-source software for the quantum world.

The Quantum AI team and collaborators from all around the world maintain and develop open-source software projects for quantum computing. We build best-in-class libraries and utilities to advance research into applications and error correction for the future of fault-tolerant quantum computing. Our open-source projects are found in repositories under the Quantumlib organization and elsewhere on GitHub.

Repositories

Our major efforts include the following:

  • Cirq: framework for creating, manipulating, and running quantum circuits on hardware or in simulation.
  • OpenFermion: framework for creating and analyzing quantum algorithms to simulate electronic structures.
  • qsim: fast state-vector simulator that integrates with Cirq and TensorFlow Quantum.
  • Qualtran: library for expressing and analyzing fault-tolerant quantum algorithms.
  • Stim: tool for high-performance simulation and analysis of quantum stabilizer circuits.
  • TensorFlow Quantum: framework for hybrid quantum-classical machine learning using TensorFlow.

Other projects include:

  • Chromobius: fast Möbius decoder for color codes used in quantum error correction.
  • ReCirq: repository of research examples and published experiments that use Cirq.
  • Tensor Network Contraction Optimizer (TNCO): high-performance library for tensor networks.
  • Tesseract Decoder: search-based decoder for quantum error correction.
  • TypedUnits: utility library for working with units of measurement.
  • Unitary: library for exploring quantum computing concepts through games.

Popular repositories Loading

  1. Cirq Cirq Public

    Python framework for creating, editing, and running Noisy Intermediate-Scale Quantum (NISQ) circuits.

    Python 5.1k 1.3k

  2. OpenFermion OpenFermion Public

    Python package for compiling and analyzing quantum algorithms to simulate electronic structures.

    Python 1.7k 436

  3. Stim Stim Public

    A fast stabilizer circuit library.

    C++ 817 228

  4. qsim qsim Public

    Fast C++ and Python library for state-vector simulation of quantum circuits.

    C++ 696 213

  5. Qualtran Qualtran Public

    Qᴜᴀʟᴛʀᴀɴ is a Python library for expressing and analyzing Fault Tolerant Quantum algorithms.

    Python 389 120

  6. ReCirq ReCirq Public

    Python modules for quantum computing applications and experiments using Cirq. Research using Cirq!

    Python 309 130

Repositories

Showing 10 of 17 repositories
  • Cirq Public

    Python framework for creating, editing, and running Noisy Intermediate-Scale Quantum (NISQ) circuits.

    quantumlib/Cirq's past year of commit activity
    Python 5,058 Apache-2.0 1,266 86 (18 issues need help) 24 Updated Sep 9, 2026
  • tesseract-decoder Public

    Search-based decoder for quantum error correction (QEC) written in C++ and Python.

    quantumlib/tesseract-decoder's past year of commit activity
    C++ 118 Apache-2.0 32 19 11 Updated Sep 9, 2026
  • OpenFermion Public

    Python package for compiling and analyzing quantum algorithms to simulate electronic structures.

    quantumlib/OpenFermion's past year of commit activity
    Python 1,733 Apache-2.0 436 21 (14 issues need help) 10 Updated Sep 7, 2026
  • Qualtran Public

    Qᴜᴀʟᴛʀᴀɴ is a Python library for expressing and analyzing Fault Tolerant Quantum algorithms.

    quantumlib/Qualtran's past year of commit activity
    Python 389 Apache-2.0 120 232 (26 issues need help) 34 Updated Sep 4, 2026
  • qsim Public

    Fast C++ and Python library for state-vector simulation of quantum circuits.

    quantumlib/qsim's past year of commit activity
    C++ 696 Apache-2.0 213 34 (4 issues need help) 14 Updated Sep 4, 2026
  • chromobius Public

    Open-source implementation of a Möbius decoder for color codes used in quantum error correction (QEC)

    quantumlib/chromobius's past year of commit activity
    Python 43 Apache-2.0 9 1 6 Updated Sep 1, 2026
  • TypedUnits Public

    A fast units and dimensions library with support for static dimensionality checking and protobuffer serialization.

    quantumlib/TypedUnits's past year of commit activity
    Python 10 Apache-2.0 8 2 (1 issue needs help) 2 Updated Aug 17, 2026
  • Stim Public

    A fast stabilizer circuit library.

    quantumlib/Stim's past year of commit activity
    C++ 817 Apache-2.0 228 70 22 Updated Aug 4, 2026
  • ReCirq Public

    Python modules for quantum computing applications and experiments using Cirq. Research using Cirq!

    quantumlib/ReCirq's past year of commit activity
    Python 309 Apache-2.0 130 15 (12 issues need help) 4 Updated Jul 17, 2026
  • .github Public
    quantumlib/.github's past year of commit activity
    0 Apache-2.0 0 0 0 Updated Jun 21, 2026