On universal quantum cloning and state estimation |
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Authors: | D Bruss |
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Institution: | Institut für Theoretische Physik, Universit?t Hannover, Appelstr. 2, 30167 Hannover, Germany, DE
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Abstract: | Both perfect cloning and perfect state estimation of an unknown pure quantum state are impossible, due to principles of quantum
mechanics. Nevertheless, they can be performed imperfectly. A link between these two scenarios allows us to derive an upper
bound for the fidelity in one of them, given an upper bound is known in the other. Furthermore, it is shown that also a lower
bound on cloning is related to an upper bound on state estimation.
Received: 15 June 1999 / Revised version: 23 September 1999 / Published online: 10 November 1999 |
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Keywords: | PACS: 03 67 -a 03 65 -w |
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