Optimal quantum cloning via spin networks

被引：16

作者：

Chen, Qing ^{[1
]}

Cheng, Jianhua

Wang, Ke-Lin

Du, Jiangfeng

机构：

[1] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Anhua 230026, Peoples R China

[2] Univ Sci & Technol China, Dept Modern Phys, Anhua 230026, Peoples R China

[3] Univ Dortmund, Fachbereich Phys, D-44221 Dortmund, Germany

来源：

PHYSICAL REVIEW A | 2006年 / 74卷 / 03期

关键词：

Electrodynamics - Electron transitions;

D O I：

10.1103/PhysRevA.74.034303

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

In this paper we demonstrate that optimal 1 -> M phase-covariant cloning quantum cloning is available via free dynamical evolution of spin networks. By properly designing the network and the couplings between spins, we show that optimal 1 -> M phase-covariant cloning can be achieved if the initial state is prepared as a specific symmetric state. Especially, when M is an odd number, the optimal phase-covariant cloning can be achieved without ancillas. Moreover, we demonstrate that the same framework is capable for optimal 1 -> 2 universal cloning.

引用

页数：4