Remove hamiltonian_expand and sum_expand (#6204)

[sc-72708] Completes the deprecation cycle for `hamiltonian_expand` and `sum_expand`. `split_non_commuting` should be used instead for both cases.
PennyLaneAI · Sep 4, 2024 · ae1f40a · ae1f40a
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diff --git a/doc/development/deprecations.rst b/doc/development/deprecations.rst
@@ -31,12 +31,6 @@ Pending deprecations
   - Deprecated in v0.38
   - Will be removed in v0.39
 
-* The functions ``qml.transforms.sum_expand`` and ``qml.transforms.hamiltonian_expand`` are deprecated.
-  Instead, ``qml.transforms.split_non_commuting`` can be used for equivalent behaviour.
-
-  - Deprecated in v0.38
-  - Will be removed in v0.39
-
 * The ``expansion_strategy`` attribute of ``qml.QNode`` is deprecated. 
   Users should make use of ``qml.workflow.construct_batch``, should they require fine control over the output tape(s).
 
@@ -129,6 +123,12 @@ Other deprecations
 Completed deprecation cycles
 ----------------------------
 
+* The functions ``qml.transforms.sum_expand`` and ``qml.transforms.hamiltonian_expand`` are deprecated.
+  Instead, ``qml.transforms.split_non_commuting`` can be used for equivalent behaviour.
+
+  - Deprecated in v0.38
+  - Removed in v0.39
+
 * ``queue_idx`` attribute has been removed from the ``Operator``, ``CompositeOp``, and ``SymboliOp`` classes. Instead, the index is now stored as the label of the ``CircuitGraph.graph`` nodes.
 
   - Deprecated in v0.38

diff --git a/doc/releases/changelog-dev.md b/doc/releases/changelog-dev.md
@@ -19,6 +19,9 @@
 
 <h3>Breaking changes 💔</h3>
 
+* `qml.transforms.hamiltonian_expand` and `qml.transforms.sum_expand` are removed.
+  Please use `qml.transforms.split_non_commuting` instead.
+
 <h3>Deprecations 👋</h3>
 
 <h3>Documentation 📝</h3>

diff --git a/pennylane/devices/__init__.py b/pennylane/devices/__init__.py
@@ -91,10 +91,7 @@
 
     defer_measurements
     transforms.broadcast_expand
-    transforms.sum_expand
     transforms.split_non_commuting
-    transforms.hamiltonian_expand
-
 
 Modifiers
 ---------

diff --git a/pennylane/transforms/__init__.py b/pennylane/transforms/__init__.py
@@ -114,9 +114,7 @@
     ~transforms.split_non_commuting
     ~transforms.split_to_single_terms
     ~transforms.broadcast_expand
-    ~transforms.hamiltonian_expand
     ~transforms.sign_expand
-    ~transforms.sum_expand
     ~transforms.convert_to_numpy_parameters
     ~apply_controlled_Q
     ~quantum_monte_carlo
@@ -320,7 +318,6 @@ def circuit(params):
 from .diagonalize_measurements import diagonalize_measurements
 from .dynamic_one_shot import dynamic_one_shot, is_mcm
 from .sign_expand import sign_expand
-from .hamiltonian_expand import hamiltonian_expand, sum_expand
 from .split_non_commuting import split_non_commuting
 from .split_to_single_terms import split_to_single_terms
 from .insert_ops import insert