fixes #9355 deprecate visualize_transition

qiskit/visualization/transition_visualization.py

@@ -10,6 +10,16 @@
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
 
+import warnings
+from qiskit.utils.deprecation import deprecate_func
+
+warnings.warn(
+    "qiskit.visualization.transition_visualization module is "
+    "deprecated since 1.1.1",
+    category=DeprecationWarning,
+    stacklevel=2
+)
+
 """
 Visualization function for animation of state transitions by applying gates to single qubit.
 """
@@ -121,6 +131,7 @@ def vector_norm(self):
         return np.linalg.norm(v)
 
 
+@deprecate_func(since="1.1.1", additional_msg="Plan to move to QuSTaR/kaleidoscope")
 def visualize_transition(circuit, trace=False, saveas=None, fpg=100, spg=2):
     """
     Creates animation showing transitions between states of a single

releasenotes/notes/deprecate-visualize_transition-8c1d257b7f37aa58.yaml

@@ -0,0 +1,6 @@
+---
+deprecations_visualization:
+  - |
+    The ``qiskit.visualization.transition_visualization`` module has been deprecated
+    and will be removed in a future release. Refer to
+    `#9355 <https://github.com/Qiskit/qiskit/issues/9355>`__ for more details.