primitives: multi-batches jobs fail on the offline simulators

[airwoodix]

Information

• Qiskit AQT provider version: 1.8.1
• Qiskit version: 1.2.4
• Python version: 3.12

The script:

from qiskit import QuantumCircuit
from qiskit_aqt_provider.primitives import AQTSampler
from qiskit_aqt_provider import AQTProvider

provider = AQTProvider()
backend = provider.get_backend("offline_simulator_no_noise")

qc = QuantumCircuit(1)
qc.x(0)
qc.measure_all()

sampler = AQTSampler(backend)
result = sampler.run([qc] * 200).result()

fails with

 Traceback (most recent call last):
  File "<...>/qiskit-aqt-provider/offline_simulator_sampler_batch_cut.py", line 13, in <module>
    result = sampler.run([qc] * 100).result()
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<...>/qiskit-aqt-provider/.direnv/python-3.12.1/lib/python3.12/site-packages/qiskit/primitives/primitive_job.py", line 51, in result
    return self._future.result()
           ^^^^^^^^^^^^^^^^^^^^^
  File "/home/ewodey/.rye/py/[email protected]/install/lib/python3.12/concurrent/futures/_base.py", line 456, in result
    return self.__get_result()
           ^^^^^^^^^^^^^^^^^^^
  File "/home/ewodey/.rye/py/[email protected]/install/lib/python3.12/concurrent/futures/_base.py", line 401, in __get_result
    raise self._exception
  File "/home/ewodey/.rye/py/[email protected]/install/lib/python3.12/concurrent/futures/thread.py", line 58, in run
    result = self.fn(*self.args, **self.kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<...>/qiskit-aqt-provider/.direnv/python-3.12.1/lib/python3.12/site-packages/qiskit/primitives/backend_sampler.py", line 162, in _call
    result, _metadata = _run_circuits(bound_circuits, self._backend, **run_options)
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<...>/qiskit-aqt-provider/.direnv/python-3.12.1/lib/python3.12/site-packages/qiskit/primitives/backend_estimator.py", line 75, in _run_circuits
    result = [x.result() for x in jobs]
              ^^^^^^^^^^
  File "<...>/qiskit-aqt-provider/qiskit_aqt_provider/aqt_job.py", line 363, in result
    self.wait_for_final_state(
  File "<...>/qiskit-aqt-provider/.direnv/python-3.12.1/lib/python3.12/site-packages/qiskit/providers/job.py", line 119, in wait_for_final_state
    status = self.status()
             ^^^^^^^^^^^^^
  File "<...>/qiskit-aqt-provider/qiskit_aqt_provider/aqt_job.py", line 294, in status
    payload = self._backend.result(uuid.UUID(self.job_id()))
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<...>/qiskit-aqt-provider/qiskit_aqt_provider/aqt_resource.py", line 518, in result
    raise api_models.UnknownJobError(str(job_id))
qiskit_aqt_provider.api_client.models.UnknownJobError: 'da732bba-bd01-4fbe-8a15-2cc9b7081974'

The problem disappears if running a batch with less than the maximum batch size of 50 circuits (AQTResource.max_circuits).

The issues only affects the online simulators. Remote resources work as expected (the 200 circuits are broken down into 4 batches of 50 circuits each and the results are successfully retrieved).