@@ -30,12 +30,12 @@ def from_classical(bitstring):

     """

     bitstring = "".join(map(str, bitstring))

-    n = len(bitstring)

+    n_qubits = len(bitstring)

     try:

         index = int(bitstring, base=2)

     except ValueError:

         raise ValueError("Input is not a classical bitstring") from None

-    state = np.zeros(2 ** n, dtype=complex)

+    state = np.zeros(1 << n_qubits, dtype=complex)

     state[index] = 1

     return state