diff --git a/src/qibotn/cutn.py b/src/qibotn/cutn.py
index 6deb078..e6f3e8c 100644
--- a/src/qibotn/cutn.py
+++ b/src/qibotn/cutn.py
@@ -5,6 +5,4 @@ from cuquantum import contract
 
 def eval(qibo_circ, datatype):
     myconvertor = QiboCircuitToEinsum(qibo_circ, dtype=datatype)
-    operands_expression = myconvertor.state_vector_operands()
-    results = contract(*operands_expression)
-    return results
+    return contract(*myconvertor.state_vector_operands())