An extensive characterization of the information flux underlying the universal cloning process is presented together with the realization of several cloning and measurement tasks. The restoration of both the quantum and classical information associated to the input qubit was theoretically analysed and experimentally accomplished. At the same time the extension of the cloning to the universal and covariant processes is reported with the first experimental optical realizations.
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Martini et al. (2005) studied this question.
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