Add work_wires property to GroverOperator (#6738)

**Context:** `qml.GroverOperator` now has a `work_wires` property similar to `MultiControlledX`. **Benefits:** Nice to have. **Possible Drawbacks:** None identified. **Related GitHub Issues:** Fixes #6591 [sc-78409] --------- Co-authored-by: Isaac De Vlugt <[email protected]>
PennyLaneAI · Dec 20, 2024 · 7d1b0e5 · 7d1b0e5
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diff --git a/doc/releases/changelog-dev.md b/doc/releases/changelog-dev.md
@@ -341,6 +341,9 @@ such as `shots`, `rng` and `prng_key`.
 
 <h4>Other Improvements</h4>
 
+* `qml.GroverOperator` now has a `work_wires` property.
+  [(#6738)](https://github.com/PennyLaneAI/pennylane/pull/6738)
+
 * `Wires` object usage across Pennylane source code has been tidied up.
   [(#6689)](https://github.com/PennyLaneAI/pennylane/pull/6689)
 

diff --git a/pennylane/templates/subroutines/grover.py b/pennylane/templates/subroutines/grover.py
@@ -123,6 +123,11 @@ def __init__(self, wires: WiresLike, work_wires: WiresLike = (), id=None):
 
         super().__init__(wires=wires, id=id)
 
+    @property
+    def work_wires(self):
+        """Additional auxiliary wires that can be used in the decomposition of :class:`~.MultiControlledX`."""
+        return self.hyperparameters["work_wires"]
+
     @property
     def num_params(self):
         return 0

diff --git a/tests/templates/test_subroutines/test_grover.py b/tests/templates/test_subroutines/test_grover.py
@@ -31,6 +31,12 @@ def test_repr():
     assert repr(op) == expected
 
 
+def test_work_wire_property():
+    op = qml.GroverOperator(wires=(0, 1, 2), work_wires=(3, 4))
+    expected = qml.wires.Wires((3, 4))
+    assert op.work_wires == expected
+
+
 def test_standard_validity():
     """Test the standard criteria for a valid operation."""
     work_wires = qml.wires.Wires((3, 4))