A remark on the optimal cloning of an N-level quantum system |
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| Authors: | S Albeverio Shao-Ming Fei |
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| Affiliation: | Institut für Angewandte Mathematik, Universit?t Bonn, 53115 Bonn, Fakult?t für Mathematik, Ruhr-Universit?t Bochum, 44780 Bochum, Germany, DE
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| Abstract: | We study quantum cloning machines (QCM) that act on an unknown N-level quantum state and make M copies. We give a formula for the maximum of the fidelity of cloning and exhibit the unitary transformations that realize
this optimal fidelity. We also extend the results to treat the case of M copies from () identical N-level quantum systems.
Received 21 September 1999 |
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| Keywords: | PACS 03 67 -a Quantum information - 89 70 +c Information science - 03 65 -w Quantum mechanics |
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