[python] Add IonQ observe broadcast regression test#4410
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1tnguyen merged 1 commit intoNVIDIA:mainfrom Apr 29, 2026
Merged
[python] Add IonQ observe broadcast regression test#44101tnguyen merged 1 commit intoNVIDIA:mainfrom
1tnguyen merged 1 commit intoNVIDIA:mainfrom
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PR NVIDIA#4395 fixed `cudaq.observe` broadcast on REST QPU targets but only added regression coverage for OQC and Quantinuum. IonQ uses the same `BaseRemoteRESTQPU` path and was explicitly listed as affected in NVIDIA#4363, so add the equivalent test against the IonQ mock server. Signed-off-by: Spencer Churchill <[email protected]>
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Summary
Follow-up to #4395 (which fixed
cudaq.observebroadcast on REST QPU targets). That PR added regression tests for OQC and Quantinuum but not IonQ, even though #4363 explicitly listed IonQ as affected. IonQ uses the sameBaseRemoteRESTQPUpath, so an analogous test intest_IonQ.pycloses the coverage gap.The new test mirrors
test_OQC_observe_broadcast/test_quantinuum_observe_broadcastexactly: a 4-sample parameter sweep throughcudaq.observe(...)onspin.z(0), with results compared to the analyticalcos(theta)answer.Verification
I reproduced the original
TypeErroragainsttarget='ionq'(bothemulate=Trueand the real cloudqpu='simulator'), applied the fix from #4395, and confirmed the broadcast call now returns correct expectation values within shot noise. The new test passes on the post-#4395 main.Test plan
yapf --style googlecleanobserve, 3 parameter sets, 200 shots, results within 0.02 of analyticalcos(theta))python/tests/backends/test_IonQ.py::test_ionq_observe_broadcast