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PennyLaneAI

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catalyst
A JIT compiler for hybrid quantum programs in PennyLane

Python · 234 stars

Beginner friendly Everything

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Create a common DecomposableGateInterface across dialects. Open

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

PennyLaneAI/catalyst#3223 · Opened Sep 14, 2026
adjoint-lowering aborts with IRMapping assertion instead of emitting a diagnostic Open

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

PennyLaneAI/catalyst#3217 · Opened Sep 10, 2026
Migrate `control-lowering` pass to QRef Open

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

PennyLaneAI/catalyst#3192 · Opened Sep 8, 2026
Missing reactive PPM handling during PBC depth analysis Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

PennyLaneAI/catalyst#3186 · Opened Sep 4, 2026
SemiAdder fails to decompose under catalyst.passes.graph_decomposition + capture=True; built-in rule bytecode is unloadable and cannot be (re)built Open

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

PennyLaneAI/catalyst#3177 · 1 comment · Opened Sep 2, 2026
compile_decomposition_rules recompiles identical operator variants many times under capture Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 72/100

PennyLaneAI/catalyst#3173 · 3 comments · Opened Sep 2, 2026
Parameter-dependent decomposition rules cannot specialize on constant parameters under capture Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 38/100

PennyLaneAI/catalyst#3172 · 6 comments · Opened Sep 2, 2026
xdsl circuit visualizer does not understand `quantum.operator` op Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

PennyLaneAI/catalyst#3139 · Opened Aug 20, 2026
3029 follow-up: Update device capabilities for dynamic allocation Open

Difficulty 3/5 1-2 days Newbie friendliness 50/100

PennyLaneAI/catalyst#3056 · Opened Jul 23, 2026
3029 follow-up: Eliminate the rebinding of allocation primitives Open

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

PennyLaneAI/catalyst#3055 · Opened Jul 23, 2026
`keep_intermediate=True` does not faithfully record initial IR received by first pass Open

compiler

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

PennyLaneAI/catalyst#2957 · Opened Jun 17, 2026
`adjoint-lowering` pass is unable to handle non-`Quantum` dialect ops Open

bug compiler

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

PennyLaneAI/catalyst#2934 · 2 comments · Opened Jun 10, 2026
Fix platform tag for macOS wheels Open

CI/Build enhancement good first issue

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

PennyLaneAI/catalyst#2907 · 2 comments · Opened Jun 2, 2026
Reduce binary package size Open

CI/Build enhancement

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

PennyLaneAI/catalyst#2906 · Opened Jun 2, 2026
`decompose-lowering`'s `prepareCallOperands` doesn't support qreg + multiple individual qubit indices Open

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

PennyLaneAI/catalyst#2869 · Opened May 22, 2026
Add explicit attribute (e.g. catalyst.main) for entry/main function Open

Difficulty 5/5 Over a week Newbie friendliness 45/100

PennyLaneAI/catalyst#2854 · Opened May 19, 2026
Better error message when no path can be found in Graph decomposition Open

compiler enhancement

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

PennyLaneAI/catalyst#2767 · 1 comment · Opened Apr 28, 2026
No persistent cross-session @qjit compilation cache — every Python session recompiles from scratch Open

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

PennyLaneAI/catalyst#2760 · Opened Apr 27, 2026
BufferizationStage IR amplification for runtime-coefficient Hamiltonians under @qjit Open

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

PennyLaneAI/catalyst#2759 · Opened Apr 27, 2026
Document and add a cmake guard for minimum compiler versions Open

CI/Build housecleaning

Difficulty 3/5 1-2 days Newbie friendliness 52/100

PennyLaneAI/catalyst#2732 · 1 reaction · Opened Apr 22, 2026
Fix issues around frontend path discovery of externally built extension modules Open

housecleaning

Difficulty 4/5 3-5 days Newbie friendliness 52/100

PennyLaneAI/catalyst#2730 · Opened Apr 21, 2026
Canonicalization of inverse extract/insert pairs on the same index is obfuscated if there is a chain of inserts Open

compiler good first issue

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

PennyLaneAI/catalyst#2726 · 2 comments · Opened Apr 21, 2026
Extend StableHLO constant propagation to DataFlowSolver Open

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

PennyLaneAI/catalyst#2707 · 4 comments · Opened Apr 16, 2026
Revisit interaction between `__revision__` and `INSTALLED` Open

housecleaning

Difficulty 3/5 1-2 days Newbie friendliness 48/100

PennyLaneAI/catalyst#2704 · Opened Apr 16, 2026
Redundant linker flag warning Open

CI/Build housecleaning

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

PennyLaneAI/catalyst#2702 · Opened Apr 16, 2026
Duplicate boost library warning Open

housecleaning runtime

Difficulty 3/5 1-2 days Newbie friendliness 42/100

PennyLaneAI/catalyst#2701 · Opened Apr 16, 2026
`bin`, `include`, and `resources` is not cleaned by `make clean` Open

CI/Build housecleaning

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

PennyLaneAI/catalyst#2699 · 1 comment · Opened Apr 16, 2026
Controlled pauli rot crashes with capture Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 52/100

PennyLaneAI/catalyst#2681 · 1 comment · Opened Apr 13, 2026
Instrument the linking process as a detailed step in the compile stage Open

enhancement frontend

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

PennyLaneAI/catalyst#2671 · Opened Apr 9, 2026
Without program capture, MLIR passes raise an error when applied to a workflow Open

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

PennyLaneAI/catalyst#2666 · 2 comments · Opened Apr 8, 2026
The docs page for `CompileOptions` is missing a description for the `target` attribute Open

documentation

Difficulty 2/5 1-3 hours Newbie friendliness 70/100

PennyLaneAI/catalyst#2653 · Opened Apr 7, 2026
Create a pass to remove global phases Open

enhancement good first issue

Difficulty 4/5 3-5 days Newbie friendliness 35/100

PennyLaneAI/catalyst#2613 · Opened Mar 20, 2026
`draw_graph`: Allow external functions without definition to pass through without `VisualizationError` Open

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

PennyLaneAI/catalyst#2609 · Opened Mar 20, 2026
`draw_graph`: Add visualization support for `scf.IndexSwitchOp` operation Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

PennyLaneAI/catalyst#2608 · Opened Mar 20, 2026
`draw_graph`: Add visualization support for `func.CallOp` operation Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

PennyLaneAI/catalyst#2607 · Opened Mar 20, 2026
Allow `--resource-tracker` pass to run on the quantum kernel module Open

enhancement

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

PennyLaneAI/catalyst#2584 · Opened Mar 12, 2026
Accurate max wire count for the `--resource-tracker` pass Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 48/100

PennyLaneAI/catalyst#2583 · Opened Mar 12, 2026
`qp.allocate(1)`: using the qubit without index works but not formally supported Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

PennyLaneAI/catalyst#2580 · 3 comments · Opened Mar 12, 2026
`catalyst.draw_graph` doesn't work with `gridsynth` Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 48/100

PennyLaneAI/catalyst#2541 · 29 comments · Opened Mar 4, 2026
Missing support for FFT Open

bug compiler

Difficulty 4/5 3-5 days Newbie friendliness 38/100

PennyLaneAI/catalyst#2521 · 1 comment · 1 reaction · Opened Feb 26, 2026
wheel packaging moves build tree artifacts to different locations and packages them Open

CI/Build enhancement

Difficulty 5/5 Over a week Newbie friendliness 20/100

PennyLaneAI/catalyst#2452 · 1 comment · Opened Jan 28, 2026
runtime subproject mixes CMake build tree artifacts with install tree artifacts Open

enhancement runtime

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

PennyLaneAI/catalyst#2451 · Opened Jan 28, 2026
Add support for rotation gates in `to_ppr` pass Open

enhancement

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

PennyLaneAI/catalyst#2429 · 5 comments · Opened Jan 23, 2026
Issues with `static_argnums` and `static_argnames` when using a pytree argument Open

bug frontend

Difficulty 4/5 3-5 days Newbie friendliness 35/100

PennyLaneAI/catalyst#2412 · 2 comments · Opened Jan 19, 2026
mcm_method='one-shot' is not supported with a dynamic number of shots Open

bug frontend

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

PennyLaneAI/catalyst#2397 · 3 comments · Opened Jan 15, 2026
Calling ``while_p.bind`` results in an error Open

bug frontend

Difficulty 3/5 1-2 days Newbie friendliness 35/100

PennyLaneAI/catalyst#2394 · 1 comment · Opened Jan 14, 2026
Dynamic one-shot execution with "hw-like" post-selection does not filter out shots with MCM in higher-order operator Open

bug frontend

Difficulty 4/5 3-5 days Newbie friendliness 38/100

PennyLaneAI/catalyst#2382 · Opened Jan 10, 2026
Provide better name for variable names debug option Open

enhancement good first issue

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

PennyLaneAI/catalyst#2376 · Opened Jan 9, 2026
``max_pauli_size=0`` meaning in PPM/PPR passes should truly mean `0`, whereas it means "infinity" currently Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 42/100

PennyLaneAI/catalyst#2375 · Opened Jan 9, 2026
`ppr-to-mbqc` pass does not support `qec.ppr.arbitrary` operations Open

enhancement

PennyLaneAI/catalyst#2372 · 1 assignee · Opened Jan 9, 2026

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