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Qubit Operator converted from fermionic op and majoranic op does not match

Status: Open.

Bug

#1232 In quantumlib/OpenFermion;

· Gopal-Dahale opened on Mar 18, 2026

simulate_trotter throws error on spin exchange Hamiltonian

area/healthInvolves code and/or project healthInvolves code and/or project health

area/trotterInvolves Trotterization or related topicsInvolves Trotterization or related topics

help wanted

priority/p2Medium priorityMedium priority

Status: Open.

Bug

#1105 In quantumlib/OpenFermion;

· ebjones424 opened on Aug 18, 2025

QubitOperator incompatible with numpy==2.3.1

area/dependenciesInvolves packages or other software that qsim depends onInvolves packages or other software that qsim depends on

area/pythonInvolves Python codeInvolves Python code

priority/p1High priorityHigh priority

Status: Open.

Bug

#1097 In quantumlib/OpenFermion;

· andrijapau opened on Jul 25, 2025

Remove global random seed used for testing

area/performanceInvolves code performanceInvolves code performance

area/pythonInvolves Python codeInvolves Python code

help wanted

no QC knowledge neededDoes not require knowledge of quantum computingDoes not require knowledge of quantum computing

priority/p2Medium priorityMedium priority

Status: Open.

Enhancement

#1060 In quantumlib/OpenFermion;

· mhucka opened on Jun 2, 2025

Are there any plans to support symbolic coefficients for QubitOperator?

area/functionalityInvolves the features and operations implemented in OpenFermionInvolves the features and operations implemented in OpenFermion

status/awaiting-responseWaiting on a response to a question or requestWaiting on a response to a question or request

Status: Open.

Question

#1053 In quantumlib/OpenFermion;

· andrewprojansky opened on May 29, 2025

get_sparse_operator fails on non-simplified QubitOperators

good first issueDoes not require upfront familiarity with the codebase. A good starting issue.Does not require upfront familiarity with the codebase. A good starting issue.

Status: Open.

Enhancement

#880 In quantumlib/OpenFermion;

· jagunther opened on Apr 30, 2024

Hubbard model notebook is flaky

area/healthInvolves code and/or project healthInvolves code and/or project health

area/testsInvolves testing and test casesInvolves testing and test cases

help wanted

priority/p2Medium priorityMedium priority

Status: Open.

Bug

#870 In quantumlib/OpenFermion;

· fdmalone opened on Feb 21, 2024

slight modification to function generate_hamiltonian ?

good first issueDoes not require upfront familiarity with the codebase. A good starting issue.Does not require upfront familiarity with the codebase. A good starting issue.

Status: Open.

Enhancement

#856 In quantumlib/OpenFermion;

· michaelkaicher opened on Jan 8, 2024

Inconsistencies in the double factorized chemistry resource estimate costing function

area/functionalityInvolves the features and operations implemented in OpenFermionInvolves the features and operations implemented in OpenFermion

help wanted

priority/p2Medium priorityMedium priority

Status: Open.

Bug

#839 In quantumlib/OpenFermion;

· fdmalone opened on Oct 17, 2023

Incorrect formula to calculate required Trotter steps

area/functionalityInvolves the features and operations implemented in OpenFermionInvolves the features and operations implemented in OpenFermion

possible bug

status/awaiting-responseWaiting on a response to a question or requestWaiting on a response to a question or request

Status: Open.

Bug

#820 In quantumlib/OpenFermion;

· kapawlak opened on Jun 15, 2023

Incorrect Bounds on Trotter Error

area/functionalityInvolves the features and operations implemented in OpenFermionInvolves the features and operations implemented in OpenFermion

area/trotterInvolves Trotterization or related topicsInvolves Trotterization or related topics

help wanted

priority/p2Medium priorityMedium priority

Status: Open.

Bug

#819 In quantumlib/OpenFermion;

· kapawlak opened on Jun 15, 2023

multiplicity limitation in molecular data

area/performanceInvolves code performanceInvolves code performance

area/pythonInvolves Python codeInvolves Python code

help wanted

priority/p2Medium priorityMedium priority

Status: Open.

Enhancement

#809 In quantumlib/OpenFermion;

· mstechly opened on Jan 25, 2023