Adds qBraid as a remote REST target in CUDA-Q by TheGupta2012 · Pull Request #4328 · NVIDIA/cuda-quantum

TheGupta2012 · 2026-04-15T10:45:12Z

Summary

Adds qBraid as a remote REST target in CUDA-Q. Kernels authored via
cudaq.set_target("qbraid", ...) are lowered to OpenQASM 2.0, submitted to the qBraid v2
API, and results are parsed back into cudaq::sample_result — with zero dependency on
the external qbraid-sdk Python package.

What's included

Target qbraid registered via runtime/cudaq/platform/default/rest/helpers/qbraid/
- QbraidServerHelper.cpp — v2 API client (submit, poll, fetch, parse)
- qbraid.yml — target config, compiler pipeline definition, declares machine and api_key arguments
Retry-with-backoff in processResults absorbs qBraid v2's COMPLETED→result-queryable
race.
Specific error handling for 401 / 403 and 409 while processing job results

Testing

C++ unit tests (unittests/backends/qbraid/): sample sync/async, observe sync/async,
future serialization, api_key-via-target-arg, job failure, result retry, retry
exhaustion
Python tests (python/tests/backends/test_Qbraid.py): full Python-binding coverage
against the mock
Target tests (targettests/qbraid/*.cpp): 13 C++ lit tests shared with other QASM2
backends

* working implementation using openQasm * modified and added test files(incomplete) * fix emulate command alignment * update polling + format * update polling interval and make code more readable * remove ionq fields from target-arguments * fix formatting * Add qBraid mock python server for testing Signed-off-by: Ryan Hill <ryanjh88@gmail.com> * Update __init__.py Signed-off-by: Ryan Hill <ryanjh88@gmail.com> * QbraidTester running correctly * added documentation for qbraid --------- Signed-off-by: Ryan Hill <ryanjh88@gmail.com> Co-authored-by: feelerx <superfeelerxx@gmail.com>

copy-pr-bot · 2026-04-15T10:45:15Z

This pull request requires additional validation before any workflows can run on NVIDIA's runners.

Pull request vetters can view their responsibilities here.

Contributors can view more details about this message here.

I, Harshit <harshit.11235@gmail.com>, hereby add my Signed-off-by to this commit: 9cd62cf I, Harshit <harshit.11235@gmail.com>, hereby add my Signed-off-by to this commit: 3b0a1e4 I, Harshit <harshit.11235@gmail.com>, hereby add my Signed-off-by to this commit: 1a24c66 Signed-off-by: Harshit <harshit.11235@gmail.com>

I, TheGupta2012 <harshit.11235@gmail.com>, hereby add my Signed-off-by to this commit: 925ae39 I, TheGupta2012 <harshit.11235@gmail.com>, hereby add my Signed-off-by to this commit: 41fe248 I, TheGupta2012 <harshit.11235@gmail.com>, hereby add my Signed-off-by to this commit: d74243d Signed-off-by: TheGupta2012 <harshit.11235@gmail.com>

Signed-off-by: TheGupta2012 <harshit.11235@gmail.com>

TheGupta2012 · 2026-04-20T12:06:22Z

Thank you @mitchdz for giving the review comments. Could you please approve the test runs so that the changes can be validated?

mitchdz · 2026-04-20T20:08:32Z

/ok to test f4907ac

Command Bot: Processing...

github-actions · 2026-04-20T23:35:18Z

CUDA Quantum Docs Bot: A preview of the documentation can be found here.

…uild and skip remote tests for qbraid Signed-off-by: TheGupta2012 <harshit.11235@gmail.com>

…piKey target param depend on emulate flag Signed-off-by: TheGupta2012 <harshit.11235@gmail.com>

TheGupta2012 · 2026-04-21T07:37:01Z

Thanks @mitchdz for approving the tests, they were helpful in figuring out a couple of bugs. I've triaged the failures and CI should hopefully pass now

mitchdz · 2026-04-22T01:39:04Z

/ok to test 39cfb72

Command Bot: Processing...

mitchdz · 2026-04-22T01:40:35Z

@TheGupta2012 I just reran CI. Sorry for the delay, I missed the email of your notification.

mitchdz · 2026-05-06T21:43:16Z

Once I have stabilized our CI for the llvm22 update, I will run this PR through the deployments pipeline. That will then generate a docker image that we can use for this testing.

ryanhill1 · 2026-05-06T21:58:10Z

Hi @mitchdz, that sounds good. Just an FYI, we are re-locating our server that runs the QIR simulator tomorrow, so that device will be offline for a few hours. Probably between 10am ~ 1pm central.

mitchdz · 2026-05-06T22:00:07Z

Many thanks for that heads up. I'm hoping to get deployments operational later tonight, and then will help generate your docker image for nightly testing. If all goes well, we can run a test tomorrow evening!

mitchdz · 2026-05-07T09:45:00Z

The CI/Deployments should be good now. Would you mind merging main into your branch? I can run deployments after that then.

mitchdz · 2026-05-08T20:15:01Z

I built the docker image, but ran into and authentication failure

failed to get manifest ghcr.io/nvidia/cuda-quantum@sha256:ec8bc5b2a2c4d4cda9b02711348ab02862089c3032353ce641516c3d7fc41484: unauthorized

This is because the ordering of when we login to GHCR is wrong. Normally we only test the nightly integration against the public final image, not these debug images.

Could you pull in the changes from #4486 into this PR and then I can rerun the test?

Signed-off-by: TheGupta2012 <harshit.11235@gmail.com>

TheGupta2012 · 2026-05-09T15:04:49Z

@mitchdz I've re-ordered the login step in the integration test, you can test again

mitchdz · 2026-05-11T18:18:59Z

Much appreciated. Looking at it now. Apologies for the back and forth here.

mitchdz · 2026-05-12T00:04:37Z

The run passed and looks good at https://github.com/NVIDIA/cuda-quantum/actions/runs/25703890336/job/75470277346

mitchdz · 2026-05-12T00:04:54Z

/ok to test ccb0c30

Command Bot: Processing...

github-actions · 2026-05-12T00:21:24Z

CI Summary (`push`) — ✅ passed

Run #25780110090 · ✅ 6 · ⏩ 7 · ❌ 0 · ⛔ 0

Top-level jobs (13)

Job	Result
`binaries`	⏩ skipped
`build_and_test`	✅ success
`config_devdeps`	✅ success
`config_source_build`	⏩ skipped
`config_wheeldeps`	✅ success
`devdeps`	✅ success
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`gen_code_coverage`	⏩ skipped
`metadata`	✅ success
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`python_wheels`	⏩ skipped
`source_build`	⏩ skipped
`wheeldeps`	✅ success

⏩ Skipped jobs (7) — intentionally skipped on PR builds; run on merge_group / workflow_dispatch

Job
`binaries`
`config_source_build`
`docker_image`
`gen_code_coverage`
`python_metapackages`
`python_wheels`
`source_build`

All sub-jobs (42) — every matrix leg, with links

Job	Status	Link
Build and test (amd64, gcc12, openmpi) / Dev environment (Debug)	✅ success	view
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CI Summary	❔ in_progress	view
Configure build (devdeps)	✅ success	view
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✅ Required checks (6/6) — declared in .github/required-checks.yml for push

Required check	Status	Link
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TheGupta2012 · 2026-05-12T05:11:00Z

@mitchdz thank you again for testing the complete pipeline! I'll look into the CI failures today, I'm assuming it was because of rebasing with main

mitchdz · 2026-05-12T18:03:44Z

/ok to test 947982e

Command Bot: Processing...

mitchdz · 2026-05-13T02:05:37Z

Let me know if you need any help with the CI failures.

Signed-off-by: TheGupta2012 <harshit.11235@gmail.com>

TheGupta2012 · 2026-05-13T05:22:47Z

@mitchdz thanks for offering! I've fixed them, they were related to the json module refactor and a spelling issue. Could you finally trigger the CI on 875d33a?

mitchdz · 2026-05-13T05:23:38Z

/ok to test 875d33a

Command Bot: Processing...

TheGupta2012 · 2026-05-13T08:10:58Z

@mitchdz CI seems to be passing now. Please let me know if any other changes are required in this PR.
Also, thanks a lot for providing very helpful feedback throughout the review process!

mitchdz

Thanks for these changes @TheGupta2012. They look good to me.

github-actions · 2026-05-13T14:07:12Z

CI Summary (`merge_group`) — ✅ passed

Run #25799667187 · ✅ 13 · ⏩ 0 · ❌ 0 · ⛔ 0

Top-level jobs (13)

Job	Result
`binaries`	✅ success
`build_and_test`	✅ success
`config_devdeps`	✅ success
`config_source_build`	✅ success
`config_wheeldeps`	✅ success
`devdeps`	✅ success
`docker_image`	✅ success
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`metadata`	✅ success
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All sub-jobs (178) — every matrix leg, with links

Job	Status	Link
Build and test (amd64, gcc12, openmpi) / Dev environment (Debug)	✅ success	view
Build and test (amd64, gcc12, openmpi) / Dev environment (Python)	✅ success	view
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Configure build (devdeps)	✅ success	view
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Create CUDA Quantum installer (amd64, 12.6) / Build CUDA Quantum assets	✅ success	view
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Create CUDA Quantum installer (arm64, 12.6) / Build CUDA Quantum assets	✅ success	view
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✅ Required checks (39/39) — declared in .github/required-checks.yml for merge_group

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Build and test (amd64, llvm, openmpi) / Dev environment (Python)	✅ success	view
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ryanhill1 and others added 6 commits April 14, 2026 12:03

update: migrate cudaq to platform v2

925ae39

fix: merge conflicts

41fe248

add: api_key and device to set_target for qbraid

d74243d

fix: submodule hashes and v2 platform implementation and test

9cd62cf

fix: formatting and headers

3b0a1e4

TheGupta2012 requested review from 1tnguyen, bettinaheim, bmhowe23 and mitchdz as code owners April 15, 2026 10:45

TheGupta2012 added 4 commits April 16, 2026 14:30

fix: docs for qbraid helper and update examples

1a24c66

Merge branch 'main' into migrate-cudaq-v2

71b9450

mitchdz reviewed Apr 17, 2026

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mitchdz reviewed Apr 17, 2026

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Comment thread runtime/cudaq/platform/default/rest/helpers/qbraid/QbraidServerHelper.cpp

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Comment thread runtime/cudaq/platform/default/rest/helpers/qbraid/QbraidServerHelper.cpp

TheGupta2012 added 2 commits April 20, 2026 11:51

fix: formatting issues, api key leak and default num of qubits

f6ba810

Signed-off-by: TheGupta2012 <harshit.11235@gmail.com>

fix: headers to use 2026

f4907ac

Signed-off-by: TheGupta2012 <harshit.11235@gmail.com>

github-actions Bot pushed a commit that referenced this pull request Apr 20, 2026

Docs preview for PR #4328.

561282b

TheGupta2012 added 3 commits April 21, 2026 06:47

fix: cmake list for qbraid to unconditionally include qbraid in the b…

a79cc61

…uild and skip remote tests for qbraid Signed-off-by: TheGupta2012 <harshit.11235@gmail.com>

fix: target tests for qbraid to use execution test pattern and make a…

38830db

…piKey target param depend on emulate flag Signed-off-by: TheGupta2012 <harshit.11235@gmail.com>

Merge branch 'main' into migrate-cudaq-v2

39cfb72

Merge remote-tracking branch 'upstream/main' into migrate-cudaq-v2

2bc6bc5

mitchdz mentioned this pull request May 8, 2026

login to GHCR before pulling image #4486

Closed

TheGupta2012 added 2 commits May 9, 2026 14:39

Merge branch 'main' into migrate-cudaq-v2

bcd43e5

fix: login order for integration tests, ref PR NVIDIA#4486

2b65005

Signed-off-by: TheGupta2012 <harshit.11235@gmail.com>

Merge branch 'main' into migrate-cudaq-v2

ccb0c30

Merge branch 'main' into migrate-cudaq-v2

947982e

fix: ci failures

875d33a

Signed-off-by: TheGupta2012 <harshit.11235@gmail.com>

mitchdz approved these changes May 13, 2026

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mitchdz added this pull request to the merge queue May 13, 2026

Merged via the queue into NVIDIA:main with commit 304955a May 13, 2026
83 of 111 checks passed

github-actions Bot pushed a commit that referenced this pull request May 13, 2026

Cleaning up docs preview for PR #4328.

3cbd57b

TheGupta2012 mentioned this pull request Jun 5, 2026

Add CUDA-Q x qBraid example notebooks and CI integration qBraid/qbraid-lab-demo#64

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