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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def aschannel(self) -> 'Channel': """Converts a Gate into a Channel"""

        N = self.qubit_nb
        R = 4

        tensor = bk.outer(self.tensor, self.H.tensor)
        tensor = bk.reshape(tensor, [2**N]*R)
        tensor = bk.transpose(tensor, [0, 3, 1, 2])

        return Channel(tensor, self.qubits)