Global-fidelity limits of state-dependent cloning of mixed states
arXiv:quant-ph/0301132 · doi:10.1103/PhysRevA.68.032303
Abstract
By relevant modifications, the known global-fidelity limits of state-dependent cloning are extended to mixed quantum states. We assume that the ancilla contains some a priori information about the input state. As it is shown, the obtained results contribute to the stronger no-cloning theorem. An attainability of presented limits is discussed.
8 pages, ReVTeX, 1 figure. In revised form an attainability of presented limits is discussed. Detected errors are corrected. Elucidative figure is added. Minor grammatical changes are made. More explanations