Qiskit-aer uses deprecated QobjDictField from qiskit

[eendebakpt]

Informations

• Qiskit Aer version: 0.15.0
• Python version: 3,12
• Operating system: Windows

What is the current behavior?

Using the Result from the Aer simulator results in deprecation warnings (for example when using copy.deepcopy or marginal_counts. The warning generated is

C:\develop\Python312\Lib\copy.py:434: DeprecationWarning: The class ``qiskit.qobj.common.QobjDictField`` is deprecated as of qiskit 1.2. It will be removed in the 2.0 release. The `Qobj` class and related functionality are part of the deprecated `BackendV1` workflow,  and no longer necessary for `BackendV2`. If a user workflow requires `Qobj` it likely relies on deprecated functionality and should be updated to use `BackendV2`.

Also see Qiskit/qiskit#13084

Steps to reproduce the problem

A minimal example:

import copy
import qiskit
from qiskit.circuit import QuantumCircuit
from qiskit_aer import AerSimulator
import qiskit_aer
print(qiskit.__version__)
print(qiskit_aer.__version__)

import warnings
warnings.simplefilter('default')

qc = QuantumCircuit(1, 1)
qc.measure_all()

backend = AerSimulator()
result = backend.run(qc, shots=100, memory=False).result()
copy.deepcopy(result);

What is the expected behavior?

No warnings should be generated

Suggested solutions