Implementing observe_policy end-to-end by Renaud-K · Pull Request #4662 · NVIDIA/cuda-quantum

Renaud-K · 2026-06-03T16:20:58Z

This is a similar change as #4557 albeit smaller since it reuse the sample_policy infrastructure.
There are still some duplication between the policy and the execution context. It will take more policies to be implemented to remove fields from the executionContext.

Maybe the more contentious point is that library mode needs to be handled differently with policies. The policies require the result to be extracted earlier in the flow on the QPU side. Library mode, however, never gets to the QPU side. This needs to be known at the time of the launch to avoid relying on the executeKernelApi. In the case of evolve, which uses observe in library mode under the hood, an RAII class is used details::with_platform_in_library_mode to temporarily turn on library mode. We can discuss ways of knowing library mode statically so we do not have to use this setting.

github-actions · 2026-06-03T17:11:07Z

CI Summary (`push`) — ✅ passed

Run #27046977963 · ✅ 6 · ⏩ 7 · ❌ 0 · ⛔ 0

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sacpis · 2026-06-03T17:25:45Z

Seems like we have a test failure.
https://github.com/NVIDIA/cuda-quantum/actions/runs/26898046741/job/79343843693?pr=4662#step:14:7443

Renaud-K · 2026-06-03T18:09:29Z

Sorry, about the CI failures. I did test these changes thoroughly but I might have added some some seemingly benign last minute changes that have fallen through the cracks. I will take care of those now.

sacpis

Left a few comments with the initial review.

copy-pr-bot · 2026-06-04T15:58:16Z

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Renaud-K · 2026-06-04T16:15:38Z

Running CI experimentally without the nvcc fixes.
/ok to test cc354d8

Renaud-K · 2026-06-04T16:16:14Z

/ok to test cc354d8

Command Bot: Processing...

Signed-off-by: Renaud Kauffmann <rkauffmann@nvidia.com>

Fixing nvcc compilation error (logger.h). Making Fermion synchronous flow closer to the original Signed-off-by: Renaud Kauffmann <rkauffmann@nvidia.com>

Renaud-K · 2026-06-04T22:15:26Z

/ok to test 6c31157

Command Bot: Processing...

lmondada

Thank you, making great strides in the refactor 🔥

I'll base my work for my next PR (#4660) on top of this one.

Signed-off-by: Luca Mondada <luca@mondada.net>

Signed-off-by: Renaud Kauffmann <rkauffmann@nvidia.com>

Renaud-K · 2026-06-06T00:18:16Z

/ok to test 31f5fca

Command Bot: Processing...

github-actions · 2026-06-08T18:39:33Z

CI Summary (`merge_group`) — ✅ passed

Run #27157188558 · ✅ 12 · ⏩ 1 · ❌ 0 · ⛔ 0

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Renaud-K requested review from 1tnguyen, amccaskey, boschmitt, khalatepradnya, lmondada, sacpis and schweitzpgi and removed request for lmondada and sacpis June 3, 2026 16:21

sacpis reviewed Jun 3, 2026

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Comment thread runtime/common/BaseRemoteRESTQPU.h Outdated

Comment thread python/cudaq/runtime/observe.py Outdated

Comment thread runtime/common/BaseRemoteRESTQPU.h Outdated

Comment thread runtime/cudaq/algorithms/observe.h Outdated

Comment thread runtime/cudaq/algorithms/observe.h Outdated

Renaud-K force-pushed the observe_policy branch from 6d7655b to a860d99 Compare June 4, 2026 15:58

Renaud-K had a problem deploying to ghcr-deployment June 4, 2026 17:51 — with GitHub Actions Failure

Renaud-K had a problem deploying to ghcr-deployment June 4, 2026 17:57 — with GitHub Actions Failure

Renaud-K added 6 commits June 4, 2026 22:13

Adding end-to-end support for the observe_policy

b2fef52

Signed-off-by: Renaud Kauffmann <rkauffmann@nvidia.com>

Undoing experimental changes

5696c4e

Signed-off-by: Renaud Kauffmann <rkauffmann@nvidia.com>

Addressing review comments and fixing the python flow.

6933784

Signed-off-by: Renaud Kauffmann <rkauffmann@nvidia.com>

Rebasing with details --> detail changes

17c3746

Signed-off-by: Renaud Kauffmann <rkauffmann@nvidia.com>

Fixing formatting

a215d34

Signed-off-by: Renaud Kauffmann <rkauffmann@nvidia.com>

Adding observe tests.

6c31157

Fixing nvcc compilation error (logger.h). Making Fermion synchronous flow closer to the original Signed-off-by: Renaud Kauffmann <rkauffmann@nvidia.com>

Renaud-K force-pushed the observe_policy branch from ee4b5b0 to 6c31157 Compare June 4, 2026 22:13

khalatepradnya reviewed Jun 4, 2026

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Comment thread python/tests/kernel/test_observe_measures_error.py

Renaud-K enabled auto-merge June 5, 2026 00:37

lmondada reviewed Jun 5, 2026

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lmondada and others added 2 commits June 5, 2026 15:29

Merge branch 'main' into observe_policy

58d6503

Signed-off-by: Luca Mondada <luca@mondada.net>

Applying review feedback

31f5fca

Signed-off-by: Renaud Kauffmann <rkauffmann@nvidia.com>

lmondada approved these changes Jun 8, 2026

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Renaud-K added this pull request to the merge queue Jun 8, 2026

Merged via the queue into NVIDIA:main with commit 8713d25 Jun 8, 2026
82 of 83 checks passed

Renaud-K deleted the observe_policy branch June 8, 2026 19:26

github-actions Bot pushed a commit that referenced this pull request Jun 8, 2026

Cleaning up docs preview for PR #4662.

f7602b5

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