Economical phase-covariant cloning of qudits

被引：78
|
作者：
Buscemi, F [1 ]
D'Ariano, GM [1 ]
Macchiavello, C [1 ]
机构：
[1] Univ Pavia, Dipartimento Fis A Volta, QUIT Grp, I-27100 Pavia, Italy
来源：
PHYSICAL REVIEW A | 2005年 / 71卷 / 04期
关键词：
D O I：
10.1103/PhysRevA.71.042327
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We derive the optimal N -> M phase-covariant quantum cloning for equatorial states in dimension d with M=kd+N, k integer. The cloning maps are optimal for both global and single-qudit fidelity. The map is achieved by an "economical" cloning machine, which works without ancilla.
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页数：7
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