From 3fe45f36218e4ec7c5d9b2ec578ca4aeb9821aff Mon Sep 17 00:00:00 2001
From: Luciano Bello <luciano.bello@ibm.com>
Date: Wed, 9 Sep 2020 20:09:37 -0400
Subject: [PATCH 1/3] exclude backend from _check_conflicting_argument

---
 qiskit/execute.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/qiskit/execute.py b/qiskit/execute.py
index 897707cdb585..2afd16e6286d 100644
--- a/qiskit/execute.py
+++ b/qiskit/execute.py
@@ -243,8 +243,7 @@ def execute(experiments, backend,
                                     coupling_map=coupling_map,
                                     seed_transpiler=seed_transpiler,
                                     backend_properties=backend_properties,
-                                    initial_layout=initial_layout,
-                                    backend=backend)
+                                    initial_layout=initial_layout)
         experiments = pass_manager.run(experiments)
     else:
         # transpiling the circuits using given transpile options

From 4b0369b3b196750c41c00c37cf0b2a9aa314a3f5 Mon Sep 17 00:00:00 2001
From: Luciano Bello <luciano.bello@ibm.com>
Date: Wed, 9 Sep 2020 20:10:20 -0400
Subject: [PATCH 2/3] test

---
 test/python/compiler/test_compiler.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/test/python/compiler/test_compiler.py b/test/python/compiler/test_compiler.py
index 2722479a43df..fe86008ccc6b 100644
--- a/test/python/compiler/test_compiler.py
+++ b/test/python/compiler/test_compiler.py
@@ -169,6 +169,18 @@ def test_parallel_compile(self):
         qobj = assemble(transpile(qlist, backend=backend))
         self.assertEqual(len(qobj.experiments), 10)
 
+    def test_no_conflict_backend_passmanager(self):
+        """execute(qc, backend=..., passmanager=...)
+        See: https://github.com/Qiskit/qiskit-terra/issues/5037
+        """
+        backend = BasicAer.get_backend('qasm_simulator')
+        qc = QuantumCircuit(2)
+        qc.u1(0, 0)
+        qc.measure_all()
+        job = execute(qc, backend=backend, pass_manager=PassManager())
+        result = job.result().get_counts()
+        self.assertEqual(result, {'00': 1024})
+
     def test_compile_single_qubit(self):
         """ Compile a single-qubit circuit in a non-trivial layout
         """

From 7a0dd0ba08ad1f72b68011a4997e1da413983fa9 Mon Sep 17 00:00:00 2001
From: Luciano Bello <luciano.bello@ibm.com>
Date: Wed, 9 Sep 2020 21:12:17 -0400
Subject: [PATCH 3/3] reno

---
 releasenotes/notes/5037-e73ce50c4ae23445.yaml | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 releasenotes/notes/5037-e73ce50c4ae23445.yaml

diff --git a/releasenotes/notes/5037-e73ce50c4ae23445.yaml b/releasenotes/notes/5037-e73ce50c4ae23445.yaml
new file mode 100644
index 000000000000..fa42d2040974
--- /dev/null
+++ b/releasenotes/notes/5037-e73ce50c4ae23445.yaml
@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    The parameters `backend` and `passmanager` in :func:`qiskit.execute.execute`
+    are not conflicting and they are simultaneously allowed now.