A remark on the optimal cloning of an N-level quantum system

被引：9

作者：

Albeverio, S ^{[1
]}

Fei, SM

机构：

[1] Univ Bonn, Inst Angew Math, D-53115 Bonn, Germany

[2] Ruhr Univ Bochum, Fak Math, D-44780 Bochum, Germany

[3] Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China

来源：

EUROPEAN PHYSICAL JOURNAL B | 2000年 / 14卷 / 04期

关键词：

D O I：

10.1007/s100510051077

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

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 nl copies from N' (M > N') identical N-level quantum systems.

引用

页码：669 / 672

页数：4

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