quantumlib

quantumlib/OpenFermion

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

1.7K stars 430 forks 1.7K watchers Python Apache License 2.0

algorithms cirq colab electronic-structure fermion google-quantum high-performance jupyter-notebook python quantum quantum-algorithms quantum-chemistry quantum-circuit quantum-computing quantum-information quantum-programming quantum-programming-language quantum-simulation sdk simulation

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35 Open Issues Need Help Last updated: Jul 12, 2026

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Regularly update Conda forge distributions of OpenFermion 10 days ago

help wanted area/devops no QC knowledge needed

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Orbital optimization 10 days ago

help wanted area/functionality priority/p2

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Hubbard model notebook is flaky 10 days ago

help wanted area/health priority/p2 area/tests

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Possible micro-optimization in linear_qubit_operator.py 13 days ago

help wanted area/performance no QC knowledge needed

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Inconsistent handling of EQ_TOLERANCE in _symbolic_operator.py 23 days ago

help wanted area/functionality area/health area/python priority/p2 no QC knowledge needed

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Mypy reports many errors, and they should be fixed about 1 month ago

help wanted area/health area/python no QC knowledge needed priority/before-1.7.2

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Basis downfolding about 1 month ago

help wanted area/functionality

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Product of FermionOperator and BosonOperator about 1 month ago

help wanted area/functionality

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Parallelization of Jordan-Wigner transformation about 1 month ago

help wanted area/performance

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Spin models on a honeycomb lattice about 1 month ago

help wanted area/functionality

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Including gausslets as a basis option about 1 month ago

help wanted large project area/functionality

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Multiplicity limitation in molecular data about 2 months ago

help wanted area/performance area/python priority/p2 priority/before-1.7.2

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Implement method for non-periodic plane wave Hamiltonians about 2 months ago

help wanted good first issue priority/p2

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

get_sparse_operator fails on non-simplified QubitOperators about 2 months ago

good first issue area/functionality priority/p2

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

`SymbolicOperator.isclose` bug for operators with many terms? about 2 months ago

help wanted area/functionality area/health priority/p2 priority/before-1.7.2

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Angle of rotation in trotterize_exp_qubop_to_qasm is off by a factor of 2 about 2 months ago

help wanted good first issue priority/p1 area/functionality area/trotter priority/before-1.7.2

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Adding type hints about 2 months ago

help wanted good first issue large project priority/p2 no QC knowledge needed

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

optimal_givens_decomposition has bad side effects about 2 months ago

help wanted area/health priority/p2 priority/before-1.7.2

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Incorrect Bounds on Trotter Error about 2 months ago

help wanted area/functionality priority/p2 area/trotter

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Change license classifier in setup.py to use SPDX license term about 2 months ago

help wanted priority/p1 area/health no QC knowledge needed

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Slight modification to function generate_hamiltonian ? 2 months ago

good first issue

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Remove global random seed used for testing 3 months ago

help wanted area/performance area/python priority/p2 no QC knowledge needed

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Applying Jordan-Wigner to FermionOperator vs. InteractionOperator 3 months ago

help wanted area/docs priority/p2

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

simulate_trotter throws error on spin exchange Hamiltonian 3 months ago

help wanted area/health priority/p2 area/trotter

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Check scripts do not check tutorials, but should 3 months ago

help wanted area/docs area/tests no QC knowledge needed

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Move tool configuration settings into `pyproject.toml` 4 months ago

help wanted area/devops no QC knowledge needed

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Remove Python 2 shims and references in the code 4 months ago

help wanted area/health area/python no QC knowledge needed

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Bug & suggestions for expectation_computational_basis_state 5 months ago

help wanted area/functionality area/health priority/p2

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Inconsistencies in the double factorized chemistry resource estimate costing function 10 months ago

help wanted area/functionality priority/p2

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Is the Jellium model Hamiltonian incorrect? 10 months ago

help wanted area/functionality priority/p2

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

The implementation of bogoliubov for a general fermionic gaussian that doesn't mix spin up and spin down is broken 10 months ago

help wanted area/functionality priority/p2

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

InteractionRDM.rotate_basis rotates incorrectly? 10 months ago

help wanted area/functionality priority/p2

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Tests flaky due to dependency on network 10 months ago

help wanted area/dependencies area/python priority/p2 no QC knowledge needed

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Change default data location to current working directory 10 months ago

help wanted good first issue priority/p2 no QC knowledge needed

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation

Proper Coulomb operators in two-dimensions 12 months ago

help wanted area/functionality

quantumlib/OpenFermion

1.7K

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

Python

#algorithms#cirq#colab#electronic-structure#fermion#google-quantum#high-performance#jupyter-notebook#python#quantum#quantum-algorithms#quantum-chemistry#quantum-circuit#quantum-computing#quantum-information#quantum-programming#quantum-programming-language#quantum-simulation#sdk#simulation