Remove WiresEnum, AllWires, and AnyWires

doc/development/deprecations.rst

@@ -48,13 +48,6 @@ Pending deprecations
   - Deprecated in v0.42
   - Will be removed in v0.43
 
-* ``qml.operation.WiresEnum``, ``qml.operation.AllWires``, and ``qml.operation.AnyWires`` are deprecated. If an operation can act
-  on any number of wires ``Operator.num_wires = None`` should be used instead. This is the default, and does not need
-  to be overridden unless the operator developer wants to validate that the correct number of wires is passed.
-
-  - Deprecated in v0.42
-  - Will be removed in v0.43
-
 * The boolean functions provided by ``pennylane.operation`` are deprecated. See below for alternate code to
   use instead.
   These include ``not_tape``, ``has_gen``, ``has_grad_method``,  ``has_multipar``, ``has_nopar``, ``has_unitary_gen``,
@@ -137,6 +130,13 @@ for details on how to port your legacy code to the new system. The following fun
 Completed deprecation cycles
 ----------------------------
 
+* ``qml.operation.WiresEnum``, ``qml.operation.AllWires``, and ``qml.operation.AnyWires`` are deprecated. If an operation can act
+  on any number of wires ``Operator.num_wires = None`` should be used instead. This is the default, and does not need
+  to be overridden unless the operator developer wants to validate that the correct number of wires is passed.
+
+  - Deprecated in v0.42
+  - Removed in v0.43
+
 * Top-level access to ``DeviceError``, ``PennyLaneDeprecationWarning``, ``QuantumFunctionError`` and ``ExperimentalWarning`` 
   is now removed in v0.43. Please import these objects from the new ``pennylane.exceptions`` module.
 

doc/releases/changelog-dev.md

@@ -68,6 +68,10 @@
 
 <h3>Breaking changes 💔</h3>
 
+* `qml.operation.WiresEnum`, `qml.operation.AllWires`, and `qml.operation.AnyWires` have been removed. Setting `Operator.num_wires = None` (the default)
+  should instead indicate that the `Operator` does not need wire validation.
+  [(#7911)](https://github.com/PennyLaneAI/pennylane/pull/7911)
+
 * Top-level access to ``DeviceError``, ``PennyLaneDeprecationWarning``, ``QuantumFunctionError`` and ``ExperimentalWarning`` has been removed. Please import these objects from the new ``pennylane.exceptions`` module.
   [(#7874)](https://github.com/PennyLaneAI/pennylane/pull/7874)
 

pennylane/operation.py

@@ -221,7 +221,6 @@
 import copy
 import warnings
 from collections.abc import Hashable, Iterable
-from enum import IntEnum
 from functools import lru_cache
 from typing import Any, Callable, Literal, Optional, Type, Union
 
@@ -300,44 +299,6 @@ class ParameterFrequenciesUndefinedError(OperatorPropertyUndefined):
     does not have parameter_frequencies"""
 
 
-# =============================================================================
-# Wire types
-# =============================================================================
-
-
-class _WiresEnum(IntEnum):
-    """Integer enumeration class
-    to represent the number of wires
-    an operation acts on.
-
-    .. warning::
-
-        This class is deprecated ``Operator.num_wires=None`` should now be used to indicate
-        that an operator can exist on any number of wires.
-
-    """
-
-    AnyWires = -1
-    """A enumeration that represents that an operator can act on any number of wires.
-
-    .. warning::
-
-        ``AnyWires`` is deprecated ``Operator.num_wires=None`` should now be used to indicate
-        that an operator can exist on any number of wires.
-
-    """
-
-    AllWires = -2
-    """A enumeration that represents that an operator acts on all wires in the system.
-
-    .. warning::
-
-        ``AllWires`` is deprecated ``Operator.num_wires=None`` should now be used to indicate
-        that an operator can exist on any number of wires.
-
-    """
-
-
 # =============================================================================
 # Class property
 # =============================================================================
@@ -1087,7 +1048,7 @@ def terms(self) -> tuple[list[TensorLike], list["Operation"]]:  # pylint: disabl
         """
         raise TermsUndefinedError
 
-    num_wires: Optional[Union[int, _WiresEnum]] = None
+    num_wires: None | int = None
     """Number of wires the operator acts on."""
 
     @property
@@ -1250,9 +1211,7 @@ def __init__(
         self._wires: Wires = Wires(wires)
 
         # check that the number of wires given corresponds to required number
-        if (self.num_wires is not None and not isinstance(self.num_wires, _WiresEnum)) and len(
-            self._wires
-        ) != self.num_wires:
+        if (self.num_wires is not None) and len(self._wires) != self.num_wires:
             raise ValueError(
                 f"{self.name}: wrong number of wires. "
                 f"{len(self._wires)} wires given, {self.num_wires} expected."
@@ -2627,27 +2586,6 @@ def __getattr__(name):
             PennyLaneDeprecationWarning,
         )
         return Observable
-    if name == "AnyWires":
-        warnings.warn(
-            "AnyWires is deprecated and will be removed in v0.43. "
-            " If your operation accepts any number of wires, set num_wires=None instead.",
-            PennyLaneDeprecationWarning,
-        )
-        return _WiresEnum.AllWires
-    if name == "AllWires":
-        warnings.warn(
-            "AllWires is deprecated and will be removed in v0.43. "
-            " If your operation accepts any number of wires, set num_wires=None instead.",
-            PennyLaneDeprecationWarning,
-        )
-        return _WiresEnum.AllWires
-    if name == "WiresEnum":
-        warnings.warn(
-            "WiresEnum is deprecated and will be removed in v0.43. "
-            " If your operation accepts any number of wires, set num_wires=None instead.",
-            PennyLaneDeprecationWarning,
-        )
-        return _WiresEnum
     if name == "StatePrep":
         return StatePrepBase
     raise AttributeError(f"module 'pennylane.operation' has no attribute '{name}'")

tests/test_operation.py

@@ -22,7 +22,6 @@
 
 import pennylane as qml
 from pennylane import numpy as pnp
-from pennylane.exceptions import PennyLaneDeprecationWarning
 from pennylane.operation import (
     _UNSET_BATCH_SIZE,
     Operation,
@@ -42,19 +41,6 @@
 I_broadcasted = I[pnp.newaxis]
 
 
-def test_wires_enum_deprecation():
-    """Test that WiresEnum, AllWires, and AnyWires are deprecated."""
-
-    with pytest.warns(PennyLaneDeprecationWarning, match="is deprecated"):
-        _ = qml.operation.WiresEnum
-
-    with pytest.warns(PennyLaneDeprecationWarning, match="is deprecated"):
-        _ = qml.operation.AllWires
-
-    with pytest.warns(PennyLaneDeprecationWarning, match="is deprecated"):
-        _ = qml.operation.AnyWires
-
-
 class TestOperatorConstruction:
     """Test custom operators' construction."""