Fix FSim serialization for zeros and ints (#4646)

* Fix FSim serialization for zeros and ints - Conversion of float args changes 0.0 to a int of 0, so this fails validation, since the current code checks isinstance float. - This PR adds ints to the type checking to fix this.
quantumlib · Nov 9, 2021 · 6f71b55 · 6f71b55
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commit 6f71b55
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diff --git a/cirq-google/cirq_google/serialization/circuit_serializer.py b/cirq-google/cirq_google/serialization/circuit_serializer.py
@@ -528,7 +528,9 @@ def _deserialize_gate_op(
                 arg_function_language=arg_function_language,
                 required_arg_name=None,
             )
-            if isinstance(theta, (float, sympy.Basic)) and isinstance(phi, (float, sympy.Basic)):
+            if isinstance(theta, (int, float, sympy.Basic)) and isinstance(
+                phi, (int, float, sympy.Basic)
+            ):
                 op = cirq.FSimGate(theta=theta, phi=phi)(*qubits)
             else:
                 raise ValueError('theta and phi must be specified for FSimGate')

diff --git a/cirq-google/cirq_google/serialization/circuit_serializer_test.py b/cirq-google/cirq_google/serialization/circuit_serializer_test.py
@@ -217,6 +217,23 @@ def circuit_proto(json: Dict, qubits: List[str]):
             }
         ),
     ),
+    (
+        cirq.FSimGate(theta=2 + sympy.Symbol('a'), phi=1)(Q0, Q1),
+        op_proto(
+            {
+                'fsimgate': {
+                    'theta': {
+                        'func': {
+                            'type': 'add',
+                            'args': [{'arg_value': {'float_value': 2.00}}, {'symbol': 'a'}],
+                        }
+                    },
+                    'phi': {'float_value': 1.0},
+                },
+                'qubit_constant_index': [0, 1],
+            }
+        ),
+    ),
     (
         cirq.FSimGate(theta=0.5, phi=0.25)(Q0, Q1),
         op_proto(
@@ -226,6 +243,24 @@ def circuit_proto(json: Dict, qubits: List[str]):
             }
         ),
     ),
+    (
+        cirq.FSimGate(theta=0.5, phi=0.0)(Q0, Q1),
+        op_proto(
+            {
+                'fsimgate': {'theta': {'float_value': 0.5}, 'phi': {'float_value': 0.0}},
+                'qubit_constant_index': [0, 1],
+            }
+        ),
+    ),
+    (
+        cirq.FSimGate(theta=2, phi=1)(Q0, Q1),
+        op_proto(
+            {
+                'fsimgate': {'theta': {'float_value': 2.0}, 'phi': {'float_value': 1.0}},
+                'qubit_constant_index': [0, 1],
+            }
+        ),
+    ),
     (
         cirq.WaitGate(duration=cirq.Duration(nanos=15))(Q0),
         op_proto(