Lower bound on the relative error of mixed-state cloning and related operations
arXiv:quant-ph/0208159 · doi:10.1088/1464-4266/5/6/017
Abstract
We extend the concept of the relative error to mixed-state cloning and related physical operations, in which the ancilla contains some a priori information about the input state. The lower bound on the relative error is obtained. It is shown that this result contributes to the stronger no-cloning theorem.
5 pages, ReVTeX, no figures. The main result is completed. The bibliography is extended and corrected. More explanations
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