ParallelExperiment gives ExperimentEntryNotFound and RuntimeError

[kevinsung]

Informations

• Qiskit Experiments version: 0.5.4
• Python version: 3.10.12
• Operating system: Arch Linux

What is the current behavior?

Steps to reproduce the problem

from qiskit import QuantumCircuit, QuantumRegister
from qiskit.circuit.library import CXGate
from qiskit_aer import AerSimulator
from qiskit_experiments.framework import ParallelExperiment
from qiskit_experiments.library import MitigatedProcessTomography

register = QuantumRegister(2, name="q")
target_circuit = QuantumCircuit(register)
a, b = register
target_circuit.append(CXGate(), [a, b])

backend = AerSimulator()
physical_qubits = list(range(4))

experiments = [
    MitigatedProcessTomography(target_circuit, backend=backend, physical_qubits=(0, 1)),
    MitigatedProcessTomography(target_circuit, backend=backend, physical_qubits=(2, 3)),
]

parallel_experiment = ParallelExperiment(experiments, backend=backend)
parallel_data = parallel_experiment.run(backend)
data = parallel_data.child_data()[0]
data.block_for_results()
val = data.analysis_results("state").value

Traceback (most recent call last):
  File "/home/kjs/projects/scratch/repro.py", line 24, in <module>
    val = data.analysis_results("state").value
  File "/home/kjs/.local/share/virtualenvs/scratch-h4kO_6N_/lib/python3.10/site-packages/qiskit_experiments/framework/experiment_data.py", line 1303, in analysis_results
    raise ExperimentEntryNotFound(_make_not_found_message(index))
qiskit_experiments.database_service.exceptions.ExperimentEntryNotFound: 'Analysis result state not found.'
Analysis callback failed [Experiment ID: bbcdc800-ce44-4c05-949f-785b2225707d][Analysis Callback ID: af181d1b23094000a8ea265ef32bde87]:
Traceback (most recent call last):
  File "/home/kjs/.local/share/virtualenvs/scratch-h4kO_6N_/lib/python3.10/site-packages/qiskit_experiments/framework/experiment_data.py", line 897, in _run_analysis_callback
    callback(self, **kwargs)
  File "/home/kjs/.local/share/virtualenvs/scratch-h4kO_6N_/lib/python3.10/site-packages/qiskit_experiments/framework/base_analysis.py", line 169, in run_analysis
    results, figures = analysis._run_analysis(expdata)
  File "/home/kjs/.local/share/virtualenvs/scratch-h4kO_6N_/lib/python3.10/site-packages/qiskit_experiments/framework/composite/composite_analysis.py", line 122, in _run_analysis
    self._analyses[i].run(sub_expdata, replace_results=True)
  File "/home/kjs/.local/share/virtualenvs/scratch-h4kO_6N_/lib/python3.10/site-packages/qiskit_experiments/framework/composite/composite_analysis.py", line 111, in run
    return super().run(experiment_data, replace_results=True, **options)
  File "/home/kjs/.local/share/virtualenvs/scratch-h4kO_6N_/lib/python3.10/site-packages/qiskit_experiments/framework/base_analysis.py", line 183, in run
    experiment_data.add_analysis_callback(run_analysis)
  File "/home/kjs/.local/share/virtualenvs/scratch-h4kO_6N_/lib/python3.10/site-packages/qiskit_experiments/framework/experiment_data.py", line 841, in add_analysis_callback
    wait_future = self._monitor_executor.submit(
  File "/home/kjs/.pyenv/versions/3.10.12/lib/python3.10/concurrent/futures/thread.py", line 169, in submit
    raise RuntimeError('cannot schedule new futures after '
RuntimeError: cannot schedule new futures after interpreter shutdown

Analysis callback failed [Experiment ID: a9fb7576-708a-4a0c-9019-009eada453f6][Analysis Callback ID: a7f64b6bfb474ece9963042cf90fb1e6]:
Traceback (most recent call last):
  File "/home/kjs/.local/share/virtualenvs/scratch-h4kO_6N_/lib/python3.10/site-packages/qiskit_experiments/framework/experiment_data.py", line 897, in _run_analysis_callback
    callback(self, **kwargs)
  File "/home/kjs/.local/share/virtualenvs/scratch-h4kO_6N_/lib/python3.10/site-packages/qiskit_experiments/framework/base_analysis.py", line 169, in run_analysis
    results, figures = analysis._run_analysis(expdata)
  File "/home/kjs/.local/share/virtualenvs/scratch-h4kO_6N_/lib/python3.10/site-packages/qiskit_experiments/library/tomography/mit_tomography_analysis.py", line 99, in _run_analysis
    roerror_analysis.run(roerror_data, replace_results=True).block_for_results()
  File "/home/kjs/.local/share/virtualenvs/scratch-h4kO_6N_/lib/python3.10/site-packages/qiskit_experiments/framework/base_analysis.py", line 183, in run
    experiment_data.add_analysis_callback(run_analysis)
  File "/home/kjs/.local/share/virtualenvs/scratch-h4kO_6N_/lib/python3.10/site-packages/qiskit_experiments/framework/experiment_data.py", line 853, in add_analysis_callback
    self._analysis_futures[cid] = self._analysis_executor.submit(
  File "/home/kjs/.pyenv/versions/3.10.12/lib/python3.10/concurrent/futures/thread.py", line 169, in submit
    raise RuntimeError('cannot schedule new futures after '
RuntimeError: cannot schedule new futures after interpreter shutdown

What is the expected behavior?

Should work.

Suggested solutions