Journal
JOURNAL OF OPTICS B-QUANTUM AND SEMICLASSICAL OPTICS
Volume 5, Issue 6, Pages S647-S650Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1464-4266/5/6/017
Keywords
mixed-state cloning; relative error of state-dependent cloning; stronger no-cloning theorem
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We extend the concept of the relative error to mixed-state cloning and related physical operations, in which the ancilla contains some information a priori about the input state. The lower bound on the relative error is obtained. It is shown that this result provides further support for a stronger no-cloning theorem.
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