Add test and reno

Qiskit · Jan 19, 2023 · 43fd417 · 43fd417
1 parent 4827256
commit 43fd417
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diff --git a/releasenotes/notes/fix-qpy-mcxgray-421cf8f673f24238.yaml b/releasenotes/notes/fix-qpy-mcxgray-421cf8f673f24238.yaml
@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Fixed a bug in QPY (:mod:`qiskit.qpy`) where circuits containing gates of class
+    :class:`.MCXGrayCode` would fail to serialize.
+    See `#9390 <https://github.com/Qiskit/qiskit-terra/issues/9390>`__.
diff --git a/test/python/circuit/test_circuit_load_from_qpy.py b/test/python/circuit/test_circuit_load_from_qpy.py
@@ -24,7 +24,15 @@
 from qiskit.circuit.quantumregister import Qubit
 from qiskit.circuit.random import random_circuit
 from qiskit.circuit.gate import Gate
-from qiskit.circuit.library import XGate, QFT, QAOAAnsatz, PauliEvolutionGate, DCXGate, MCU1Gate
+from qiskit.circuit.library import (
+    XGate,
+    QFT,
+    QAOAAnsatz,
+    PauliEvolutionGate,
+    DCXGate,
+    MCU1Gate,
+    MCXGrayCode,
+)
 from qiskit.circuit.instruction import Instruction
 from qiskit.circuit.parameter import Parameter
 from qiskit.circuit.parametervector import ParameterVector
@@ -1043,9 +1051,11 @@ def test_open_controlled_gate(self):
 
     def test_standard_control_gates(self):
         """Test standard library controlled gates."""
-        qc = QuantumCircuit(3)
+        qc = QuantumCircuit(6)
         mcu1_gate = MCU1Gate(np.pi, 2)
+        mcx_gray_gate = MCXGrayCode(5)
         qc.append(mcu1_gate, [0, 2, 1])
+        qc.append(mcx_gray_gate, list(range(0, 6)))
         qc.mcp(np.pi, [0, 2], 1)
         qc.mct([0, 2], 1)
         qc.mcx([0, 2], 1)