Remove deprecated code in 0.19 (#10791)

* remove-deprecated-code-in-0.19

* update docs

* Apply suggestions from code review

Co-authored-by: Luciano Bello <bel@zurich.ibm.com>

* remove unused function

---------

Co-authored-by: Luciano Bello <bel@zurich.ibm.com>

qiskit/compiler/assembler.py

@@ -27,7 +27,7 @@ from qiskit.exceptions import QiskitError
 from qiskit.providers.backend import Backend
 from qiskit.pulse import Instruction, LoConfig, Schedule, ScheduleBlock
 from qiskit.pulse.channels import PulseChannel
-from qiskit.qobj import Qobj, QobjHeader
+from qiskit.qobj import QasmQobj, PulseQobj, QobjHeader
 from qiskit.qobj.utils import MeasLevel, MeasReturnType
 
 logger = logging.getLogger(__name__)
@@ -74,7 +74,7 @@ def assemble(
     parametric_pulses: Optional[List[str]] = None,
     init_qubits: bool = True,
     **run_config: Dict,
-) -> Qobj:
+) -> Union[QasmQobj, PulseQobj]:
     """Assemble a list of circuits or pulse schedules into a ``Qobj``.
 
     This function serializes the payloads, which could be either circuits or schedules,

qiskit/providers/models/backendconfiguration.py

@@ -26,7 +26,6 @@ from qiskit.pulse.channels import (
     DriveChannel,
     MeasureChannel,
 )
-from qiskit.utils.deprecation import deprecate_arg
 
 
 class GateConfig:
@@ -831,22 +830,13 @@ class PulseBackendConfiguration(QasmBackendConfiguration):
             raise BackendConfigurationError(f"Invalid index for {qubit}-qubit systems.")
         return AcquireChannel(qubit)
 
-    @deprecate_arg(
-        "channel",
-        since="0.19.0",
-        additional_msg=(
-            "Instead, use the ``qubits`` argument. This method will now return accurate "
-            "ControlChannels determined by qubit indices."
-        ),
-    )
-    def control(self, qubits: Iterable[int] = None, channel: int = None) -> List[ControlChannel]:
+    def control(self, qubits: Iterable[int] = None) -> List[ControlChannel]:
         """
         Return the secondary drive channel for the given qubit -- typically utilized for
         controlling multiqubit interactions. This channel is derived from other channels.
 
         Args:
             qubits: Tuple or list of qubits of the form `(control_qubit, target_qubit)`.
-            channel: Deprecated.
 
         Raises:
             BackendConfigurationError: If the ``qubits`` is not a part of the system or if
@@ -855,8 +845,6 @@ class PulseBackendConfiguration(QasmBackendConfiguration):
         Returns:
             List of control channels.
         """
-        if channel is not None:
-            qubits = [channel]
         try:
             if isinstance(qubits, list):
                 qubits = tuple(qubits)

qiskit/qobj/__init__.py

@@ -23,7 +23,6 @@ Base
 .. autosummary::
    :toctree: ../stubs/
 
-   Qobj
    QobjExperimentHeader
    QobjHeader
 
@@ -74,14 +73,3 @@ from qiskit.qobj.qasm_qobj import QasmQobjInstruction
 from qiskit.qobj.qasm_qobj import QasmQobjExperiment
 from qiskit.qobj.qasm_qobj import QasmQobjConfig
 from qiskit.qobj.qasm_qobj import QasmQobjExperimentConfig
-
-from qiskit.utils.deprecation import deprecate_func
-
-
-class Qobj(QasmQobj):
-    """A backwards compat alias for QasmQobj."""
-
-    @deprecate_func(additional_msg="Instead, use QasmQobj or PulseQobj", since="0.19.0")
-    def __init__(self, qobj_id=None, config=None, experiments=None, header=None):
-        """Initialize a Qobj object."""
-        super().__init__(qobj_id=qobj_id, config=config, experiments=experiments, header=header)

qiskit/transpiler/instruction_durations.py

@@ -16,20 +16,13 @@ from typing import Optional, List, Tuple, Union, Iterable
 
 import qiskit.circuit
 from qiskit.circuit import Barrier, Delay
-from qiskit.circuit import Instruction, Qubit, ParameterExpression
+from qiskit.circuit import Instruction, ParameterExpression
 from qiskit.circuit.duration import duration_in_dt
 from qiskit.providers import Backend
 from qiskit.transpiler.exceptions import TranspilerError
-from qiskit.utils.deprecation import deprecate_arg
 from qiskit.utils.units import apply_prefix
 
 
-def _is_deprecated_qubits_argument(qubits: Union[int, list[int], Qubit, list[Qubit]]) -> bool:
-    if isinstance(qubits, (int, Qubit)):
-        qubits = [qubits]
-    return isinstance(qubits[0], Qubit)
-
-
 class InstructionDurations:
     """Helper class to provide durations of instructions for scheduling.
 
@@ -130,7 +123,6 @@ class InstructionDurations:
             )
         else:
             for i, items in enumerate(inst_durations):
-
                 if not isinstance(items[-1], str):
                     items = (*items, "dt")  # set default unit
 
@@ -170,19 +162,10 @@ class InstructionDurations:
 
         return self
 
-    @deprecate_arg(
-        "qubits",
-        deprecation_description=(
-            "Using a Qubit or List[Qubit] for the ``qubits`` argument to InstructionDurations.get()"
-        ),
-        additional_msg="Instead, use an integer for the qubit index.",
-        since="0.19.0",
-        predicate=_is_deprecated_qubits_argument,
-    )
     def get(
         self,
         inst: str | qiskit.circuit.Instruction,
-        qubits: int | list[int] | Qubit | list[Qubit] | list[int | Qubit],
+        qubits: int | list[int],
         unit: str = "dt",
         parameters: list[float] | None = None,
     ) -> float:
@@ -192,7 +175,7 @@ class InstructionDurations:
 
         Args:
             inst: An instruction or its name to be queried.
-            qubits: Qubits or its indices that the instruction acts on.
+            qubits: Qubit indices that the instruction acts on.
             unit: The unit of duration to be returned. It must be 's' or 'dt'.
             parameters: The value of the parameters of the desired instruction.
 
@@ -212,12 +195,9 @@ class InstructionDurations:
         else:
             inst_name = inst
 
-        if isinstance(qubits, (int, Qubit)):
+        if isinstance(qubits, int):
             qubits = [qubits]
 
-        if isinstance(qubits[0], Qubit):
-            qubits = [q.index for q in qubits]
-
         try:
             return self._get(inst_name, qubits, unit, parameters)
         except TranspilerError as ex:

qiskit/utils/quantum_instance.py

@@ -21,7 +21,7 @@ import warnings
 
 import numpy as np
 
-from qiskit.qobj import Qobj
+from qiskit.qobj import QasmQobj, PulseQobj
 from qiskit.utils import circuit_utils
 from qiskit.exceptions import QiskitError
 from qiskit.utils.backend_utils import (
@@ -451,7 +451,7 @@ class QuantumInstance:
 
         return transpiled_circuits
 
-    def assemble(self, circuits) -> Qobj:
+    def assemble(self, circuits) -> Union[QasmQobj, PulseQobj]:
         """assemble circuits"""
         # pylint: disable=cyclic-import
         from qiskit import compiler

releasenotes/notes/remove-deprecated-code-in-0.19-a97ccfec62405b9a.yaml

@@ -0,0 +1,10 @@
+---
+upgrade:
+  - |
+    The argument ``qubits`` in the method :meth:`qiskit.transpiler.instruction_durations.InstructionDurations.get`, does not accept :class:`.Qubit` (or a list of them) any more. This functionality was deprecated in Qiskit 0.33 (with Terra 0.19), released on Dec 2021. Instead, use an integer for the qubit indices.
+
+  - |
+    The argument ``channel`` in the method :meth:`qiskit.providers.models.backendconfiguration.PulseBackendConfiguration.control` is removed. It was deprecated in Qiskit 0.33 (with Terra 0.19), released on Dec 2021. Instead use  the ``qubits`` argument.
+
+  - |
+    The class ``qiskit.qobj.Qobj`` is removed. It was deprecated in Qiskit 0.33 (with Terra 0.19), released on Dec 2021. Instead, use :class:`qiskit.qobj.QasmQobj` or :class:`qiskit.qobj.PulseQobj`.