Optimal cloning with respect to the relative error
نویسنده
چکیده
The relative error of cloning of states with arbitrary prior probabilities is considered. It is assumed that ancilla may contain some a priori information about states to be cloned. The lower bound on the relative error for general cloning scenario is derived. Both the case of two-state set and case of multi-state set are analyzed. The made conclusions complete subject of the stronger no-cloning theorem. The quantum circuit for optimal cloning of pair of pure states is constructed. The general method based on simple geometrical picture is described. PACS: 03.67.-a, 03.65.Ta
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تاریخ انتشار 2009