diff --git a/qadence/noise/protocols.py b/qadence/noise/protocols.py
index af74e01e..fdb0f46d 100644
--- a/qadence/noise/protocols.py
+++ b/qadence/noise/protocols.py
@@ -149,16 +149,22 @@ def list(cls) -> list:
         return list(filter(lambda el: not el.startswith("__"), dir(cls)))
 
     def filter(self, protocol: NoiseEnum | str) -> NoiseHandler | None:
-        is_protocol: list = list()
         if protocol == NoiseProtocol.READOUT:
-            is_protocol = [p == protocol for p in self.protocol]
+
+            def filter_fn(p: NoiseEnum | str) -> bool:
+                return p == protocol
+
         else:
-            is_protocol = [isinstance(p, protocol) for p in self.protocol]  # type: ignore[arg-type]
+
+            def filter_fn(p: NoiseEnum | str) -> bool:
+                return isinstance(p, protocol)  # type: ignore[arg-type]
+
+        protocol_matches: list = list(filter(filter_fn, self.protocol))
         # if we have at least a match
-        if sum(is_protocol) > 0:
+        if True in protocol_matches:
             return NoiseHandler(
-                list(compress(self.protocol, is_protocol)),
-                list(compress(self.options, is_protocol)),
+                list(compress(self.protocol, protocol_matches)),
+                list(compress(self.options, protocol_matches)),
             )
         return None