  The correspondence principle suggests that a quantum description for the
microworld should be naturally transited to a classical description within the
classical limit. However, it seems that there is a large gap between quantum
no-cloning and classical duplication. In this paper, we prove that a classical
duplication process can be realized using a universal quantum cloning machine.
In the classical world, information is encoded in a large number of quantum
states instead of one quantum state. When tolerable errors occur in a small
number of the quantum states, the fidelity of duplicated copies of classical
information can approach unity. That is, classical information duplication is
equivalent to a redundant quantum cloning process with self-correcting.
