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PennyLaneAI · Sep 20, 2024 · d1db2bc · d1db2bc
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Showing 2 changed files with 5 additions and 3 deletions.
diff --git a/pennylane_lightning/core/_serialize.py b/pennylane_lightning/core/_serialize.py
@@ -285,6 +285,9 @@ def _pauli_word(self, observable, wires_map: dict = None):
         def map_wire(wire: int):
             return wires_map[wire] if wires_map else wire
 
+        if len(observable) == 0:
+            return self.named_obs(PAULI_NAME_MAP["I"], [map_wire(0)])
+
         if len(observable) == 1:
             wire, pauli = list(observable.items())[0]
             return self.named_obs(PAULI_NAME_MAP[pauli], [map_wire(wire)])

diff --git a/tests/test_execute.py b/tests/test_execute.py
@@ -33,9 +33,6 @@ class TestQChem:
     def test_VQE_gradients(self, diff_method, tol):
         """Test if the VQE procedure returns the expected gradients."""
 
-        if qml.operation.active_new_opmath() and device_name == "lightning.tensor":
-            pytest.skip("The new operation math is not yet fully supported for lightning.tensor")
-
         symbols = ["H", "H"]
 
         geometry = np.array(
@@ -71,6 +68,8 @@ def test_VQE_gradients(self, diff_method, tol):
 
             qml.expval(H)
 
+        # print(H)
+
         num_params = len(excitations)
         tape.trainable_params = np.linspace(1, num_params, num_params, dtype=int).tolist()