Qiskit/qiskit

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Qiskit is an open-source SDK for working with quantum computers at the level of extended quantum circuits, operators, and primitives.

Stars: 7.8k
Forks: 3k
Open beginner issues: 8
Indexed issues: 717
Avg merge: 3d 13h
Merged PRs (30d): 70

Dominant language: Python
License: Apache-2.0
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 20, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: good first issue help wanted

Beginner friendly Everything

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717 open issues indexed

Add DAGCircuit.get_var() (and get_stretch()) for parity with QuantumCircuit and CircuitData Open

type: feature request

Difficulty 3/5 1-2 days Newbie friendliness 74/100

Qiskit/qiskit#17019 · Opened Sep 20, 2026
dt appears to be broken Open

bug

Qiskit/qiskit#17018 · 1 assignee · Opened Sep 20, 2026
Add ASV benchmarks for MCX gates Open

performance type: feature request type: qa

Qiskit/qiskit#17016 · 1 comment · 1 assignee · Opened Sep 20, 2026
Add `Param::Expr` and use in Rust `Store`, `Delay` Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

Qiskit/qiskit#17001 · Opened Sep 17, 2026
QPY does not preserve the inverse of a StatePreparation Open

bug mod: qpy

Difficulty 3/5 1-2 days Newbie friendliness 65/100

Qiskit/qiskit#17000 · Opened Sep 16, 2026
`remove_final_measurements` breaks circuits with feed-forward Open

bug

Qiskit/qiskit#16998 · 2 comments · 1 assignee · Opened Sep 15, 2026
Default `qasm3` exporter fails on array params Open

bug mod: qasm3

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

Qiskit/qiskit#16995 · Opened Sep 15, 2026
QuantumCircuit.append(CircuitInstruction, qargs=qargs) silently ignores `qargs` (or `cargs`) Open

Difficulty 2/5 1-3 hours Newbie friendliness 74/100

Qiskit/qiskit#16992 · 1 comment · Opened Sep 15, 2026
`HoareOptimizer` drops a `z` gate that is not trivial, after a deleted DAG node's index gets reused Open

bug mod: transpiler

Qiskit/qiskit#16977 · 1 comment · 1 assignee · Opened Sep 11, 2026
Potential missed optimization: Removing diagonal gates only once before measurement Open

mod: transpiler type: feature request

Qiskit/qiskit#16976 · 2 comments · 1 assignee · Opened Sep 11, 2026
Update QPY to track `Delay` duration values as unsigned integers Open

mod: qpy type: discussion

Difficulty 4/5 3-5 days Newbie friendliness 48/100

Qiskit/qiskit#16972 · 1 comment · Opened Sep 9, 2026
DAGCircuit.__deepcopy__ rejects non-dict memo objects Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 67/100

Qiskit/qiskit#16965 · 5 comments · Opened Sep 8, 2026
PyArrow makes SIGSEGV Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

Qiskit/qiskit#16925 · 1 comment · Opened Sep 3, 2026
OpenQASM 2 importer fails on any expression inside an included file Open

bug mod: qasm2

Qiskit/qiskit#16918 · 1 comment · 1 assignee · Opened Sep 3, 2026
QPY panic from unexpected enum value Open

bug mod: qpy

Difficulty 4/5 3-5 days Newbie friendliness 45/100

Qiskit/qiskit#16910 · 1 comment · Opened Sep 2, 2026
OQ2 import phase 4: expose the native loader to C Open

C API mod: qasm2

Qiskit/qiskit#16909 · 1 assignee · Opened Sep 2, 2026
Python free-threading on Python 3.14t and 3.15t Open

type: feature request

Difficulty 4/5 3-5 days Newbie friendliness 42/100

Qiskit/qiskit#16893 · 3 comments · Opened Aug 31, 2026
`CommutativeOptimization` ignores evolution time when comparing `PauliEvolutionGate` Hamiltonians Open

bug

Qiskit/qiskit#16873 · 3 comments · 1 assignee · Opened Aug 29, 2026
`LightCone` can change expectation values by replacing projector products with Pauli products Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

Qiskit/qiskit#16872 · 1 comment · Opened Aug 29, 2026
`LookaheadSwap` can reorder operations that write to the same Clbit Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 78/100

Qiskit/qiskit#16870 · Opened Aug 29, 2026
`HoareOptimizer` ignores ctrl_state and assumes all controlled gates use all-ones controls Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

Qiskit/qiskit#16867 · 2 comments · Opened Aug 28, 2026
`LightCone` reverses the association between bit_terms and observable indices Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

Qiskit/qiskit#16866 · 1 comment · Opened Aug 28, 2026
`TwoQubitPeepholeOptimization` applies a fidelity cutoff with `approximation_degree=1.0` Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 55/100

Qiskit/qiskit#16864 · 4 comments · 1 reaction · Opened Aug 28, 2026
`UnrollForLoops` can rebind break_loop inside SwitchCaseOp to an outer loop Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 78/100

Qiskit/qiskit#16863 · 1 comment · Opened Aug 28, 2026
`FindCommutingPauliEvolutions` ignores gate qargs and changes asymmetric Pauli evolutions Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

Qiskit/qiskit#16860 · Opened Aug 28, 2026
`LookaheadSwap` silently drops zero-qubit Store instructions Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 65/100

Qiskit/qiskit#16858 · Opened Aug 28, 2026
`SabreSwap` can violate loop layout invariants when break_loop or continue_loop bypasses restoration SWAPs Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 65/100

Qiskit/qiskit#16857 · 1 comment · Opened Aug 28, 2026
`Commuting2qGateRouter` silently drops a later commuting gate after previous routing changes the layout Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 74/100

Qiskit/qiskit#16855 · 1 comment · Opened Aug 28, 2026
`OptimizeSwapBeforeMeasure` can drop observable terminal SWAPs inside control-flow blocks Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 75/100

Qiskit/qiskit#16853 · Opened Aug 28, 2026
Conversion from `sympy` tp `ParameterExpression` Open

type: feature request

Difficulty 4/5 3-5 days Newbie friendliness 48/100

Qiskit/qiskit#16841 · 3 comments · Opened Aug 26, 2026
QPY 19 payload size reduction Open

mod: qpy type: enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

Qiskit/qiskit#16829 · 1 comment · Opened Aug 25, 2026
Fix register aliasing for Rust-defined circuits Open

bug Rust synthesis

Qiskit/qiskit#16819 · 5 comments · 2 assignees · Opened Aug 24, 2026
Introduce QPY 19 that more closely mirrors Rust data model Open

mod: qpy type: feature request

Qiskit/qiskit#16814 · 2 comments · 1 assignee · Opened Aug 21, 2026
unused np.isclose() inside SparsePauliOp.simplify Open

mod: quantum info

Difficulty 2/5 1-3 hours Newbie friendliness 74/100

Qiskit/qiskit#16796 · 1 comment · 1 reaction · Opened Aug 19, 2026
Optimization opportunities for parameter expressions Open

type: feature request

Qiskit/qiskit#16786 · 2 comments · 2 assignees · Opened Aug 17, 2026
Bloch.show() raises TypeError on every matplotlib backend Open

Difficulty 1/5 Under an hour Newbie friendliness 88/100

Qiskit/qiskit#16741 · 4 comments · Opened Aug 11, 2026
Bloch.plot_vectors() raises TypeError when vector_style is set to the documented empty-string 'simple line' style Open

Difficulty 1/5 Under an hour Newbie friendliness 88/100

Qiskit/qiskit#16740 · 1 comment · Opened Aug 11, 2026
Expose `ParameterExpression` string parsing publicly Open

type: feature request

Difficulty 5/5 Over a week Newbie friendliness 35/100

Qiskit/qiskit#16736 · 2 comments · Opened Aug 11, 2026
Rust circuit drawer panics when given an empty circuit Open

bug good first issue mod: visualization Rust

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

Qiskit/qiskit#16723 · 4 comments · Opened Aug 9, 2026
Remove `PyO3` dependency on the `qiskit-circuit` crate. Open

type: feature request

Qiskit/qiskit#16716 · 1 assignee · Opened Aug 6, 2026
StatePreparation unitary matrix composition accumulates exponential $L_2$ error as qubit count increases Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

Qiskit/qiskit#16689 · 5 comments · Opened Jul 31, 2026
UnitarySynthesis() interprets an empty basis as Clifford+T, causing unintended approximation and extreme circuit expansion Open

bug

Qiskit/qiskit#16688 · 6 comments · 1 assignee · Opened Jul 31, 2026
Extend the C API to support creation of classical expressions Open

C API mod: circuit type: feature request

Difficulty 5/5 Over a week Newbie friendliness 35/100

Qiskit/qiskit#16667 · Opened Jul 26, 2026
Add support for big integers in the C API Open

C API type: feature request

Difficulty 5/5 Over a week Newbie friendliness 35/100

Qiskit/qiskit#16666 · Opened Jul 26, 2026
Support removal of instructions from a Target Open

type: feature request

Difficulty 5/5 Over a week Newbie friendliness 48/100

Qiskit/qiskit#16638 · 4 comments · Opened Jul 22, 2026
Investigate `clippy::needless_collect` warnings in Rust crates Open

Rust

Qiskit/qiskit#16634 · 4 comments · 1 assignee · Opened Jul 21, 2026
Retrieve and Query Custom Operations from the C API Open

type: feature request

Qiskit/qiskit#16622 · 1 assignee · Opened Jul 20, 2026
Create Operations using the C API Open

C API type: feature request

Qiskit/qiskit#16621 · 1 assignee · Opened Jul 20, 2026
SabreLayout returns the final forward-backward iterate, not the best one it found Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

Qiskit/qiskit#16612 · 1 comment · Opened Jul 18, 2026
`z3-solver==5.0.0.0` fails to load on macOS 15 / Python 3.10 in CI Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

Qiskit/qiskit#16601 · Opened Jul 17, 2026

Qiskit/qiskit

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