Update use of classes removed in Qiskit 2.0

qiskit_ibm_runtime/fake_provider/fake_backend.py

@@ -52,6 +52,9 @@
     QasmBackendConfiguration,
     PulseBackendConfiguration,
 )
+from ..models.exceptions import (
+    BackendPropertyError,
+)
 
 logger = logging.getLogger(__name__)
 
@@ -493,9 +496,6 @@ def _get_noise_model_from_backend_v2(  # type: ignore
         """
 
         from qiskit.circuit import Delay  # pylint: disable=import-outside-toplevel
-        from qiskit.providers.exceptions import (  # pylint: disable=import-outside-toplevel
-            BackendPropertyError,
-        )
         from qiskit_aer.noise import NoiseModel  # pylint: disable=import-outside-toplevel
         from qiskit_aer.noise.device.models import (  # pylint: disable=import-outside-toplevel
             _excited_population,

qiskit_ibm_runtime/ibm_backend.py

@@ -16,10 +16,9 @@
 from typing import Iterable, Union, Optional, Any, List
 from datetime import datetime as python_datetime
 from copy import deepcopy
+from packaging.version import Version
 
-from qiskit import QuantumCircuit
-from qiskit.qobj.utils import MeasLevel, MeasReturnType
-
+from qiskit import QuantumCircuit, __version__ as qiskit_version
 from qiskit.providers.backend import BackendV2 as Backend
 from qiskit.providers.options import Options
 from qiskit.pulse.channels import (
@@ -56,6 +55,12 @@
 )
 from .utils import local_to_utc
 
+if Version(qiskit_version) == "2":
+    from qiskit.result import MeasLevel, MeasReturnType
+else:
+    from qiskit.qobj.utils import MeasLevel, MeasReturnType
+
+
 logger = logging.getLogger(__name__)
 
 QOBJRUNNERPROGRAMID = "circuit-runner"

qiskit_ibm_runtime/models/backend_configuration.py

@@ -20,7 +20,6 @@
 from collections import defaultdict
 
 from qiskit.exceptions import QiskitError
-from qiskit.providers.exceptions import BackendConfigurationError
 from qiskit.pulse.channels import (
     AcquireChannel,
     Channel,
@@ -29,6 +28,7 @@
     MeasureChannel,
 )
 
+from .exceptions import BackendConfigurationError
 
 GateConfigT = TypeVar("GateConfigT", bound="GateConfig")
 UchannelLOT = TypeVar("UchannelLOT", bound="UchannelLO")  # pylint: disable=[invalid-name]

qiskit_ibm_runtime/models/backend_properties.py

@@ -17,9 +17,10 @@
 from typing import Any, Iterable, Tuple, Union, Dict, TypeVar, Type, List
 import dateutil.parser
 
-from qiskit.providers.exceptions import BackendPropertyError
 from qiskit.utils.units import apply_prefix
 
+from .exceptions import BackendPropertyError
+
 PropertyT = Tuple[Any, datetime.datetime]
 NduvT = TypeVar("NduvT", bound="Nduv")
 GatePropertiesT = TypeVar("GatePropertiesT", bound="GateProperties")

qiskit_ibm_runtime/models/exceptions.py

@@ -0,0 +1,27 @@
+# This code is part of Qiskit.
+#
+# (C) Copyright IBM 2025.
+#
+# This code is licensed under the Apache License, Version 2.0. You may
+# obtain a copy of this license in the LICENSE.txt file in the root directory
+# of this source tree or at http://www.apache.org/licenses/LICENSE-2.0.
+#
+# Any modifications or derivative works of this code must retain this
+# copyright notice, and modified files need to carry a notice indicating
+# that they have been altered from the originals.
+
+"""Exceptions for errors raised while handling Backends and Jobs."""
+
+from qiskit.exceptions import QiskitError
+
+
+class BackendPropertyError(QiskitError):
+    """Base class for errors raised while looking for a backend property."""
+
+    pass
+
+
+class BackendConfigurationError(QiskitError):
+    """Base class for errors raised by the BackendConfiguration."""
+
+    pass

qiskit_ibm_runtime/utils/backend_converter.py

@@ -29,10 +29,10 @@
 from qiskit.circuit.library.standard_gates import get_standard_gate_name_mapping
 from qiskit.circuit.parameter import Parameter
 from qiskit.providers.backend import QubitProperties
-from qiskit.providers.exceptions import BackendPropertyError
 from qiskit.transpiler.target import InstructionProperties, Target
 
 from ..models import BackendConfiguration, BackendProperties, PulseDefaults
+from ..models.exceptions import BackendPropertyError
 
 # is_fractional_gate used to be defined in this module and might be referenced
 # from here externally

qiskit_ibm_runtime/utils/options.py

@@ -14,8 +14,14 @@
 
 from dataclasses import asdict, dataclass
 from typing import Dict, Union, Any, Optional
-from qiskit.circuit import QuantumCircuit
-from qiskit.qobj.utils import MeasLevel, MeasReturnType
+from packaging.version import Version
+
+from qiskit import QuantumCircuit, __version__ as qiskit_version
+
+if Version(qiskit_version) == "2":
+    from qiskit.result import MeasLevel, MeasReturnType
+else:
+    from qiskit.qobj.utils import MeasLevel, MeasReturnType
 
 
 @dataclass