Add dynamic circuits backend filter (#1291)

* Add dynamic circuits backend filter

* add reno

qiskit_ibm_runtime/qiskit_runtime_service.py

@@ -538,6 +538,7 @@ def backends(
         name: Optional[str] = None,
         min_num_qubits: Optional[int] = None,
         instance: Optional[str] = None,
+        dynamic_circuits: Optional[bool] = None,
         filters: Optional[Callable[[List["ibm_backend.IBMBackend"]], bool]] = None,
         **kwargs: Any,
     ) -> List["ibm_backend.IBMBackend"]:
@@ -548,6 +549,7 @@ def backends(
             min_num_qubits: Minimum number of qubits the backend has to have.
             instance: This is only supported for ``ibm_quantum`` runtime and is in the
                 hub/group/project format.
+            dynamic_circuits: Filter by whether the backend supports dynamic circuits.
             filters: More complex filters, such as lambda functions.
                 For example::
 
@@ -630,6 +632,15 @@ def backends(
             backends = list(
                 filter(lambda b: b.configuration().n_qubits >= min_num_qubits, backends)
             )
+
+        if dynamic_circuits is not None:
+            backends = list(
+                filter(
+                    lambda b: ("qasm3" in getattr(b.configuration(), "supported_features", []))
+                    == dynamic_circuits,
+                    backends,
+                )
+            )
         return filter_backends(backends, filters=filters, **kwargs)
 
     def _set_backend_config(self, backend_name: str, instance: Optional[str] = None) -> None:

releasenotes/notes/dynamic-circuits-filter-59f771a9b43c00cd.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    Added a new parameter, `dynamic_circuits` to :meth:`~qiskit_ibm_runtime.QiskitRuntimeService.backends`
+    to allow filtering of backends that support dynamic circuits.