Global-fidelity limits of state-dependent cloning of mixed states
Alexey Eduardovich Rastegin · Physical Review A · 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.