Optimal Cloning of Unitary Transformation

被引：57
|
作者：
Chiribella, Giulio [1 ]
D'Ariano, Giacomo Mauro
Perinotti, Paolo
机构：
[1] Dipartimento Fis A Volta, QUIT Grp, I-27100 Pavia, Italy
来源：
PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 18期
关键词：
D O I：
10.1103/PhysRevLett.101.180504
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
After proving a general no-cloning theorem for black boxes, we derive the optimal universal cloning of unitary transformations, from one to two copies. The optimal cloner is realized by quantum channels with memory, and greatly outperforms the optimal measure-and-reprepare cloning strategy. Applications are outlined, including two-way quantum cryptographic protocols.
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页数：4
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