From 3dbded9755c24dd17362381879b25e4784ece4c8 Mon Sep 17 00:00:00 2001
From: Kevin Hartman <kevin@hart.mn>
Date: Sun, 2 Jul 2023 19:41:44 -0400
Subject: [PATCH] Add release note.

---
 .../notes/sabre-ctrl-flow-o1-431cd25a19adbcdc.yaml    | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 releasenotes/notes/sabre-ctrl-flow-o1-431cd25a19adbcdc.yaml

diff --git a/releasenotes/notes/sabre-ctrl-flow-o1-431cd25a19adbcdc.yaml b/releasenotes/notes/sabre-ctrl-flow-o1-431cd25a19adbcdc.yaml
new file mode 100644
index 000000000000..e80e77bc308d
--- /dev/null
+++ b/releasenotes/notes/sabre-ctrl-flow-o1-431cd25a19adbcdc.yaml
@@ -0,0 +1,11 @@
+---
+upgrade:
+  - |
+    The Sabre family of transpiler passes (namely :class:`.SabreLayout`
+    and :class:`.SabreSwap`) are now used by default for all circuits
+    when invoking the transpiler at optimization level 1 (e.g. calling
+    :func:`.transpile` or :func:`.generate_preset_pass_manager` with 
+    keyword argument ``optimization_level=1``). Previously, circuits
+    with control flow operations used :class:`.DenseLayout` and
+    :class:`.StochasticSwap` with this profile.
+