From 340ef4c49c79e6d25c10efb585547ed966074d82 Mon Sep 17 00:00:00 2001
From: Shelly Garion <shelly@il.ibm.com>
Date: Thu, 28 Dec 2023 09:19:49 +0000
Subject: [PATCH] move qsd from qiskit/quantum_info/synthesis to
 qiskit/synthesis/unitary

---
 qiskit/circuit/library/generalized_gates/unitary.py |  2 +-
 qiskit/synthesis/__init__.py                        |  5 +++++
 qiskit/synthesis/unitary/__init__.py                | 13 +++++++++++++
 .../synthesis => synthesis/unitary}/qsd.py          |  0
 .../passes/synthesis/unitary_synthesis.py           |  2 +-
 test/python/synthesis/test_synthesis.py             |  2 +-
 6 files changed, 21 insertions(+), 3 deletions(-)
 create mode 100644 qiskit/synthesis/unitary/__init__.py
 rename qiskit/{quantum_info/synthesis => synthesis/unitary}/qsd.py (100%)

diff --git a/qiskit/circuit/library/generalized_gates/unitary.py b/qiskit/circuit/library/generalized_gates/unitary.py
index 3b15e83196c6..6d0cdf0f949f 100644
--- a/qiskit/circuit/library/generalized_gates/unitary.py
+++ b/qiskit/circuit/library/generalized_gates/unitary.py
@@ -146,7 +146,7 @@ def _define(self):
         elif self.num_qubits == 2:
             self.definition = two_qubit_cnot_decompose(self.to_matrix())
         else:
-            from qiskit.quantum_info.synthesis.qsd import (  # pylint: disable=cyclic-import
+            from qiskit.synthesis.unitary.qsd import (  # pylint: disable=cyclic-import
                 qs_decomposition,
             )
 
diff --git a/qiskit/synthesis/__init__.py b/qiskit/synthesis/__init__.py
index f4d6a73f2a70..c865464ca79c 100644
--- a/qiskit/synthesis/__init__.py
+++ b/qiskit/synthesis/__init__.py
@@ -89,6 +89,10 @@
 
 .. autofunction:: synth_qft_line
 
+Unitary Synthesis
+=================
+
+.. autofunction:: qs_decomposition
 """
 
 from .evolution import (
@@ -126,3 +130,4 @@
 from .stabilizer import synth_stabilizer_layers, synth_stabilizer_depth_lnn
 from .discrete_basis import SolovayKitaevDecomposition, generate_basic_approximations
 from .qft import synth_qft_line
+from .unitary.qsd import qs_decomposition
diff --git a/qiskit/synthesis/unitary/__init__.py b/qiskit/synthesis/unitary/__init__.py
new file mode 100644
index 000000000000..f19592ee8bdb
--- /dev/null
+++ b/qiskit/synthesis/unitary/__init__.py
@@ -0,0 +1,13 @@
+# This code is part of Qiskit.
+#
+# (C) Copyright IBM 2017 - 2023.
+#
+# This code is licensed under the Apache License, Version 2.0. You may
+# obtain a copy of this license in the LICENSE.txt file in the root directory
+# of this source tree or at http://www.apache.org/licenses/LICENSE-2.0.
+#
+# Any modifications or derivative works of this code must retain this
+# copyright notice, and modified files need to carry a notice indicating
+# that they have been altered from the originals.
+
+"""Module containing unitary synthesis methods."""
diff --git a/qiskit/quantum_info/synthesis/qsd.py b/qiskit/synthesis/unitary/qsd.py
similarity index 100%
rename from qiskit/quantum_info/synthesis/qsd.py
rename to qiskit/synthesis/unitary/qsd.py
diff --git a/qiskit/transpiler/passes/synthesis/unitary_synthesis.py b/qiskit/transpiler/passes/synthesis/unitary_synthesis.py
index f7f30fc284c7..5335a8251540 100644
--- a/qiskit/transpiler/passes/synthesis/unitary_synthesis.py
+++ b/qiskit/transpiler/passes/synthesis/unitary_synthesis.py
@@ -866,7 +866,7 @@ def run(self, unitary, **options):
                 default=None,
             )
         else:
-            from qiskit.quantum_info.synthesis.qsd import (  # pylint: disable=cyclic-import
+            from qiskit.synthesis.unitary.qsd import (  # pylint: disable=cyclic-import
                 qs_decomposition,
             )
 
diff --git a/test/python/synthesis/test_synthesis.py b/test/python/synthesis/test_synthesis.py
index bc460825807e..9216ee3a919d 100644
--- a/test/python/synthesis/test_synthesis.py
+++ b/test/python/synthesis/test_synthesis.py
@@ -78,7 +78,7 @@
 )
 
 from qiskit.circuit.library.standard_gates.equivalence_library import _cnot_rxx_decompose
-from qiskit.quantum_info.synthesis import qsd
+from qiskit.synthesis.unitary import qsd
 from qiskit.test import QiskitTestCase