Phys. Rev. A 68, 032303 (2003) [6 pages]Global-fidelity limits of state-dependent cloning of mixed statesReceived 27 January 2003; published 10 September 2003 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. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.68.032303
DOI:
10.1103/PhysRevA.68.032303
PACS:
03.67.-a, 03.65.Ta
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