NVIDIA/cuda-quantum

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C++ and Python support for the CUDA Quantum programming model for heterogeneous quantum-classical workflows

Stars: 1.1k
Forks: 456
Open beginner issues: 10
Indexed issues: 375
Avg merge: 1d 22h
Merged PRs (30d): 165

Dominant language: C++
License: Apache-2.0
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: good first issue

Beginner friendly Everything

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375 open issues indexed

PyKernel.__call__ validates a runtime list argument's length against the wrong quantity Open

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

NVIDIA/cuda-quantum#5424 · Opened Sep 14, 2026
Reduce Clifford overhead in equal-T GridSynth approximations Open

enhancement

NVIDIA/cuda-quantum#5416 · 1 assignee · Opened Sep 11, 2026
`cudaq.adjoint()` gives the wrong rotation angle Open

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

NVIDIA/cuda-quantum#5403 · 5 comments · Opened Sep 10, 2026
subveq at a call site is not converted to linear values Open

stale-notified

NVIDIA/cuda-quantum#5400 · 1 assignee · Opened Sep 9, 2026
Factory is overly general Open

stale-notified

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

NVIDIA/cuda-quantum#5399 · Opened Sep 9, 2026
Credentials passed as target arguments are logged in plaintext (api_key, secret_key, tokens) Open

bug Exalate

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

NVIDIA/cuda-quantum#5388 · 2 comments · Opened Sep 8, 2026
Fix 404s from PR #4617: add stub pages for relocated/reauthored notebooks Open

Exalate stale-notified

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

NVIDIA/cuda-quantum#5386 · Opened Sep 8, 2026
[python] Kernel with a return only inside a dynamic-bound loop compiles without a return-type check Open

stale-notified

Difficulty 2/5 1-3 hours Newbie friendliness 85/100

NVIDIA/cuda-quantum#5369 · 2 comments · Opened Sep 3, 2026
ScalarOperator.parameters silently loses docstring text when "Arguments" appears in prose above the real Args: header Open

bug Exalate stale-notified

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

NVIDIA/cuda-quantum#5361 · Opened Sep 2, 2026
cudaq.evolve() on a batch of super-operators wrongly forces a mixed (density-matrix) state Open

bug Exalate stale-notified

Difficulty 2/5 1-3 hours Newbie friendliness 90/100

NVIDIA/cuda-quantum#5356 · Opened Sep 1, 2026
Broadcast observe/sample silently replaces a fixed scalar argument with 0 Open

stale-notified

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

NVIDIA/cuda-quantum#5353 · Opened Sep 1, 2026
OperatorSum.evaluate() adds a spurious zero-coefficient identity term for multi-term operators Open

stale-notified

Difficulty 2/5 1-3 hours Newbie friendliness 85/100

NVIDIA/cuda-quantum#5348 · Opened Sep 1, 2026
Followup to #5321 Open

stale-notified

NVIDIA/cuda-quantum#5347 · 1 comment · 2 assignees · Opened Sep 1, 2026
dynamics: integrator_options is shared across BaseIntegrator instances Open

bug Exalate stale-notified

Difficulty 2/5 1-3 hours Newbie friendliness 85/100

NVIDIA/cuda-quantum#5344 · Opened Sep 1, 2026
Zero-length dynamic control vectors are misinterpreted as scalar controls Open

stale-notified

NVIDIA/cuda-quantum#5331 · 1 assignee · Opened Aug 31, 2026
move the TargetConfig.* sources to the runtime folder Open

maintenance

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

NVIDIA/cuda-quantum#5328 · 2 comments · Opened Aug 31, 2026
Delegate compiler flags to `cudaq-translate` Open

stale-notified

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

NVIDIA/cuda-quantum#5299 · Opened Aug 27, 2026
Keep the `StackFramePrealloc` pass invocation in the common target codegen pipeline Open

stale-notified

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

NVIDIA/cuda-quantum#5272 · Opened Aug 26, 2026
cudaq.sample's feedback rejection is entry-kernel-only: measurement branching inside a called sub-kernel is not rejected Open

stale-notified

Difficulty 4/5 3-5 days Newbie friendliness 62/100

NVIDIA/cuda-quantum#5259 · Opened Aug 25, 2026
cudaq.draw raises IndexError (vector::_M_range_check) on kernels with mid-circuit measurement feedback Open

stale-notified

Difficulty 4/5 3-5 days Newbie friendliness 58/100

NVIDIA/cuda-quantum#5258 · 2 comments · Opened Aug 25, 2026
cudaq.control on a kernel containing mid-circuit measurement is silently accepted; result is trajectory-dependent Open

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

NVIDIA/cuda-quantum#5257 · 1 comment · Opened Aug 25, 2026
Loop variable read after a zero trip for returns uninitialized memory Open

stale-notified

NVIDIA/cuda-quantum#5250 · 1 comment · 1 assignee · Opened Aug 25, 2026
Incorrect value when a loop body copies the induction variable Open

stale-notified

NVIDIA/cuda-quantum#5245 · 1 comment · 1 assignee · Opened Aug 24, 2026
Python `set_target` silently ignores arguments whose YAML keys contain hyphens Open

stale-notified

Difficulty 3/5 1-2 days Newbie friendliness 72/100

NVIDIA/cuda-quantum#5202 · 1 comment · Opened Aug 20, 2026
`__nvqpp_vectorCopyCtor` gets external linkage, breaking links with >1 device translation unit Open

stale-notified

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

NVIDIA/cuda-quantum#5199 · Opened Aug 19, 2026
Analysis for grouping/ordering values representing a single program qubit Open

stale-notified

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

NVIDIA/cuda-quantum#5196 · 1 comment · Opened Aug 19, 2026
swap.ctrl loses its control when translating to OpenQASM 2 Open

stale-notified

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

NVIDIA/cuda-quantum#5192 · 6 comments · Opened Aug 19, 2026
Python API docs and docstrings contradict the code in several places Open

stale-notified

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

NVIDIA/cuda-quantum#5181 · Opened Aug 18, 2026
cudaq.draw with a format string and kernel arguments raises AssertionError Open

stale-notified

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

NVIDIA/cuda-quantum#5179 · Opened Aug 18, 2026
A Python exception inside a Kraus channel aborts the process instead of propagating Open

stale-notified

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

NVIDIA/cuda-quantum#5178 · 2 comments · Opened Aug 18, 2026
Bare break/continue in a for loop emits wrong-arity IR and fails the verifier Open

stale-notified

Difficulty 2/5 1-3 hours Newbie friendliness 25/100

NVIDIA/cuda-quantum#5176 · Opened Aug 18, 2026
for...else / while...else bodies are silently discarded when the loop is unrolled Open

stale-notified

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

NVIDIA/cuda-quantum#5174 · Opened Aug 18, 2026
Integer base with a negative exponent returns 0.0 in kernels (2 ** -1) Open

stale-notified

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

NVIDIA/cuda-quantum#5167 · Opened Aug 18, 2026
kernel.apply_call raises AttributeError for a value-returning @cudaq.kernel Open

stale-notified

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

NVIDIA/cuda-quantum#5164 · Opened Aug 18, 2026
Float literal -1.0 is folded to an integer constant, so 2 ** -1.0 returns 0.0 in a kernel Open

stale-notified

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

NVIDIA/cuda-quantum#5160 · Opened Aug 18, 2026
Python kernel % lowers to unsigned remainder, giving wrong results for negative operands Open

stale-notified

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

NVIDIA/cuda-quantum#5159 · Opened Aug 18, 2026
Follow-up work from #5113 (inject-implicit-output): disabled tests and underlying bugs Open

stale-notified

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

NVIDIA/cuda-quantum#5154 · 4 comments · Opened Aug 17, 2026
Document how circuit optimizations should work with scopes/other control-flow today Open

enhancement stale-notified

NVIDIA/cuda-quantum#5108 · 1 assignee · Opened Aug 11, 2026
Published llms.txt links do not resolve: llms-full.txt is missing and the file is not served at the site root Open

stale-notified

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

NVIDIA/cuda-quantum#5100 · Opened Aug 11, 2026
Introduce `EstimateResult` and `estimate` launch policy as the contract for `estimate_resources` Open

enhancement stale-notified

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

NVIDIA/cuda-quantum#5050 · 2 comments · Opened Aug 4, 2026
Add a “Copy as Markdown” button to CUDA-Q documentation pages Open

enhancement Exalate stale-notified

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

NVIDIA/cuda-quantum#5041 · 2 comments · Opened Aug 2, 2026
Introduce a stable plugin API version independent of cudaq-version Open

enhancement stale-notified

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

NVIDIA/cuda-quantum#5037 · 1 comment · Opened Jul 30, 2026
Add DARUAN single-qubit activation application example Open

stale-notified

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

NVIDIA/cuda-quantum#5028 · Opened Jul 30, 2026
Passing a `qvector` to a multi-qubit custom operation fails Open

c++ language documentation stale-notified

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

NVIDIA/cuda-quantum#4961 · 4 comments · Opened Jul 22, 2026
External backends: support Fermioniq/QESEM-style server-side observe (not only ServerHelper + remote_rest sample) Open

stale-notified

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

NVIDIA/cuda-quantum#4926 · 4 comments · Opened Jul 15, 2026
cudaq.adjoint fails ('could not autogenerate the adjoint of a kernel') on a unitary kernel with conditionally-conjugated rotations in nested loops Open

stale-notified

NVIDIA/cuda-quantum#4898 · 1 comment · 2 assignees · Opened Jul 10, 2026
[python] Control sets cannot mix a qubit with a qview, and cudaq.control fails on kernels that call other kernels Open

stale-notified

NVIDIA/cuda-quantum#4848 · 1 comment · 1 assignee · Opened Jul 5, 2026
`cudaq::logical_observable` should accept a runtime observable index Open

enhancement stale-notified

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

NVIDIA/cuda-quantum#4842 · 1 comment · 1 reaction · Opened Jul 4, 2026
Documentation clarification: ConnectX-7 dual-port recommendation for the NVQLink latency demo Open

stale-notified

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

NVIDIA/cuda-quantum#4828 · 4 comments · Opened Jul 2, 2026
The CUDA-Q code base uses .h not .hpp for header files Open

stale-notified

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

NVIDIA/cuda-quantum#4808 · 1 comment · Opened Jun 30, 2026

NVIDIA/cuda-quantum

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