Fix a bug is StabilizerState repr (#11368)

* fix a bug in StabilizerState repr

* add a test to check repr does not throw an error

* add release notes

(cherry picked from commit 1b69780)

qiskit/quantum_info/states/stabilizerstate.py

@@ -95,7 +95,7 @@ def __eq__(self, other):
         return (self._data.stab == other._data.stab).all()
 
     def __repr__(self):
-        return f"StabilizerState({self._data.stabilizer})"
+        return f"StabilizerState({self._data.to_labels(mode='S')})"
 
     @property
     def clifford(self):

releasenotes/notes/fix-stabilizerstate-repr-908c830028b1f868.yaml

@@ -0,0 +1,4 @@
+---
+fixes:
+  - |
+    Fix a bug in the :class:`.StabilizerState` string representation.

test/python/quantum_info/states/test_stabilizerstate.py

@@ -980,6 +980,12 @@ def test_stabilizer_bell_equiv(self):
         self.assertFalse(cliff1.equiv(cliff3))
         self.assertFalse(cliff2.equiv(cliff4))
 
+    def test_visualize_does_not_throw_error(self):
+        """Test to verify that drawing StabilizerState does not throw an error"""
+        clifford = random_clifford(3, seed=0)
+        stab = StabilizerState(clifford)
+        _ = repr(stab)
+
 
 if __name__ == "__main__":
     unittest.main()