def expand(self, other):
return self._tensor_product(other, reverse=True)<EOL>
Return the tensor product channel other ⊗ self.

        Args:
            other (QuantumChannel): a quantum channel.

        Returns:
            PTM: the tensor product channel other ⊗ self as a PTM object.

        Raises:
            QiskitError: if other cannot be converted to a channel.