fixing a bug in json noise model import

src/Python/qsharp-core/qsharp/clients/iqsharp.py

@@ -205,7 +205,7 @@ def _simulate_noise(self, op, **kwargs) -> Any:
     def _get_noise_model(self) -> str:
         return self._execute('%experimental.noise_model')
 
-    def _set_noise_model(self, op, json_data : str) -> None:
+    def _set_noise_model(self, json_data : str) -> None:
         # We assume json_data is already serialized, so that we skip the support
         # provided by _execute_magic and call directly.
         return self._execute(f'%experimental.noise_model {json_data}')

src/Python/qsharp-core/qsharp/experimental.py

@@ -22,6 +22,7 @@
 
 import qsharp
 from qsharp.loader import QSharpCallable
+import json
 
 ## EXPORTS ##