Quantum cloning in spin networks

被引：45

作者：

De Chiara, G

Fazio, R

Macchiavello, C

Montangero, S

Palma, GM

机构：

[1] INFM, NEST, I-56126 Pisa, Italy

[2] INFM, I-27100 Pavia, Italy

[3] Dipartimento Fis A Volta, I-27100 Pavia, Italy

[4] Univ Milan, INFM, NEST, I-26013 Crema, CR, Italy

[5] Univ Milan, Dipartimento Tecnol Informaz, I-26013 Crema, CR, Italy

来源：

PHYSICAL REVIEW A | 2004年 / 70卷 / 06期

关键词：

D O I：

10.1103/PhysRevA.70.062308

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We introduce an approach to quantum cloning based on spin networks and we demonstrate that phase covariant cloning can be realized using no external control but only with a proper design of the Hamiltonian of the system. In the 1-->2 cloning we find that the XY model saturates the value for the fidelity of the optimal cloner and gives values comparable to it in the general N-->M case. We finally discuss the effect of external noise. Our protocol is much more robust to decoherence than a conventional procedure based on quantum gates.

引用

页码：062308 / 1

页数：4

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