Deprecate decompose_operation in cirq_google. (quantumlib#4924)

More of quantumlib#4744 .
rht · May 1, 2023 · e91be48 · e91be48
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diff --git a/cirq-google/cirq_google/devices/xmon_device.py b/cirq-google/cirq_google/devices/xmon_device.py
@@ -66,6 +66,10 @@ def metadata(self) -> cirq.GridDeviceMetadata:
     def qubit_set(self) -> FrozenSet[cirq.GridQubit]:
         return self.qubits
 
+    @_compat.deprecated(
+        deadline='v0.15',
+        fix='XmonDevice.decompose_operation is deperecated. Please use ConvertToXmonGates().',
+    )
     def decompose_operation(self, operation: cirq.Operation) -> cirq.OP_TREE:
         return convert_to_xmon_gates.ConvertToXmonGates().convert(operation)
 

diff --git a/cirq-google/cirq_google/devices/xmon_device_test.py b/cirq-google/cirq_google/devices/xmon_device_test.py
@@ -181,6 +181,14 @@ def test_validate_measurement_non_adjacent_qubits_ok():
     )
 
 
+@mock.patch.dict(os.environ, clear='CIRQ_TESTING')
+def test_decompose_operation_deprecated():
+    d = square_device(3, 3)
+
+    with cirq.testing.assert_deprecated('decompose', deadline='v0.15'):
+        _ = d.decompose_operation(cirq.H(cirq.GridQubit(1, 1)))
+
+
 @mock.patch.dict(os.environ, clear='CIRQ_TESTING')
 def test_validate_operation_existing_qubits():
     d = square_device(3, 3, holes=[cirq.GridQubit(1, 1)])