Fix Parameter uuid on deserialization

qiskit_ibm_provider/qpy/binary_io/value.py

@@ -212,8 +212,7 @@ def _read_parameter(file_obj):  # type: ignore[no-untyped-def]
     )
     param_uuid = uuid.UUID(bytes=data.uuid)
     name = file_obj.read(data.name_size).decode(common.ENCODE)
-    param = Parameter.__new__(Parameter, name, uuid=param_uuid)
-    param.__init__(name)  # pylint: disable=unnecessary-dunder-call
+    param = Parameter(name, uuid=param_uuid)
     return param
 
 

test/unit/test_serialization.py

@@ -106,3 +106,18 @@ def test_noise_model(self):
         self.assertIsInstance(decoded, NoiseModel)
         self.assertEqual(noise_model.noise_qubits, decoded.noise_qubits)
         self.assertEqual(noise_model.noise_instructions, decoded.noise_instructions)
+
+    def test_param(self):
+        """Test encoding and decoding a parameter."""
+        param = Parameter("a")
+        encoded = json.dumps(param, cls=RuntimeEncoder)
+        self.assertIsInstance(encoded, str)
+        with warnings.catch_warnings():
+            warnings.filterwarnings(
+                "ignore",
+                category=DeprecationWarning,
+            )
+            decoded = json.loads(encoded, cls=RuntimeDecoder)
+        self.assertIsInstance(decoded, Parameter)
+        self.assertEqual(param.name, decoded.name)
+        self.assertEqual(param._uuid, decoded._uuid)