diff --git a/README.md b/README.md
index 74e1e3a..b7532ac 100644
--- a/README.md
+++ b/README.md
@@ -45,7 +45,9 @@ computation_settings = {
 }
 
 
-qibo.set_backend(backend="qibotn", runcard=computation_settings)
+qibo.set_backend(backend="qibotn", platform="cutensornet", runcard=computation_settings)  #cuQuantum
+# qibo.set_backend(backend="qibotn", platform="qutensornet", runcard=computation_settings) #quimb
+
 
 # Construct the circuit
 c = Circuit(2)
diff --git a/src/qibotn/QiboCircuitConvertor.py b/src/qibotn/QiboCircuitConvertor.py
index c59745b..5ac2fee 100644
--- a/src/qibotn/QiboCircuitConvertor.py
+++ b/src/qibotn/QiboCircuitConvertor.py
@@ -166,7 +166,6 @@ class QiboCircuitToEinsum:
         input_operands = self._get_bitstring_tensors(input_bitstring)
         pauli_string = dict(zip(range(self.circuit.nqubits), pauli_string))
         pauli_map = pauli_string
-        coned_qubits = pauli_map.keys()
 
         (
             mode_labels,