diff --git a/src/qibotn/QiboCircuitConvertor.py b/src/qibotn/QiboCircuitConvertor.py
index 45000df..f92e1cd 100644
--- a/src/qibotn/QiboCircuitConvertor.py
+++ b/src/qibotn/QiboCircuitConvertor.py
@@ -1,8 +1,6 @@
 import cupy as cp
 import numpy as np
 
-EINSUM_SYMBOLS_BASE = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
-
 
 class QiboCircuitToEinsum:
     def __init__(self, circuit, dtype="complex128"):
@@ -54,21 +52,13 @@ class QiboCircuitToEinsum:
         operands = input_operands + gate_operands
         mode_labels += gate_mode_labels
 
-        expression = self._convert_mode_labels_to_expression(
-            mode_labels, qubits_frontier
-        )
+        out_list = []
+        for key in qubits_frontier:
+            out_list.append(qubits_frontier[key])
 
-        return expression, operands
-
-    def _get_symbol(self, i):
-        """
-        Return a Unicode as label for index.
-
-        .. note:: This function is adopted from `opt_einsum <https://optimized-einsum.readthedocs.io/en/stable/_modules/opt_einsum/parser.html#get_symbol>`_
-        """
-        if i < 52:
-            return EINSUM_SYMBOLS_BASE[i]
-        return chr(i + 140)
+        operand_exp_interleave = [x for y in zip(operands, mode_labels) for x in y]
+        operand_exp_interleave.append(out_list)
+        return operand_exp_interleave
 
     def _init_mode_labels_from_qubits(self, qubits):
         frontier_dict = {}
@@ -104,17 +94,3 @@ class QiboCircuitToEinsum:
                 next_frontier += 1
             mode_labels.append(output_mode_labels + input_mode_labels)
         return mode_labels, operands
-
-    def _convert_mode_labels_to_expression(self, input_mode_labels, output_mode_labels):
-        out_list = []
-        for key in output_mode_labels:
-            out_list.append(output_mode_labels[key])
-
-        input_symbols = [
-            "".join(map(self._get_symbol, idx)) for idx in input_mode_labels
-        ]
-        expression = (
-            ",".join(input_symbols) + "->" + "".join(map(self._get_symbol, out_list))
-        )
-
-        return expression
diff --git a/src/qibotn/__main__.py b/src/qibotn/__main__.py
index edbb52b..03db083 100644
--- a/src/qibotn/__main__.py
+++ b/src/qibotn/__main__.py
@@ -47,7 +47,6 @@ def main(args: argparse.Namespace):
     nqubits = args.nqubits
     circuit_name = args.circuit
     datatype = args.precision
-    # Create qibo quibit
 
     if circuit_name in ("qft", "QFT"):
         circuit = QFT(nqubits)
@@ -55,12 +54,10 @@ def main(args: argparse.Namespace):
         raise NotImplementedError(f"Cannot find circuit {circuit_name}.")
 
     myconvertor = QiboCircuitToEinsum(circuit, dtype=datatype)
-    expression, operands = myconvertor.state_vector()
+    operands_expression = myconvertor.state_vector()
 
     result_qibo = run_bench(circuit, "Qibo")
-    sv_cutn = run_bench(
-        lambda: contract(expression, *operands), "cuQuantum cuTensorNet"
-    )
+    sv_cutn = run_bench(lambda: contract(*operands_expression), "cuQuantum cuTensorNet")
 
     # print(f"is sv in agreement?", cp.allclose(sv_cutn.flatten(), result_qibo.state(numpy=True)))
     assert cp.allclose(sv_cutn.flatten(), result_qibo.state(numpy=True))