Optimal symmetric economical phase-covariant quantum cloning

被引：20
|
作者：
Zhang, Wen-Hai [1 ]
Yu, Long-Bao
Ye, Liu
Dai, Jie-Lin
机构：
[1] Anhui Univ, Sch Phys & Mat Sci, Hefei 230039, Peoples R China
[2] Anhui Inst Educ, Dept Phys & Elect Engn, Hefei 230061, Peoples R China
来源：
PHYSICS LETTERS A | 2007年 / 360卷 / 06期
基金：
中国国家自然科学基金;
关键词：
quantum cloning; economical phase-covariant quantum cloning;
D O I：
10.1016/j.physleta.2006.09.002
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We derive the explicit transformation of the optimal symmetric economical 1 -> M phase-covariant quantum cloning machine (EPCCM), which works without ancilla, as well as the corresponding fidelities in 2-dimension. The fidelity (1 -> M = 2k + 1 EPCCM) is covered with previous contributions [G.M. D'Ariano, et al., Phys. Rev. A 71 (2005) 042327]. Meanwhile, the explicit transformation of the optimal symmetric 1 -> M phase-covariant quantum cloning machine (PCCM) (working with ancilla) as well as the corresponding fidelities in 2-dimension is also derived. The results of the PCCM agree with previous contributions [H. Fan, et al., Phys. Rev. A 65 (2001) 012304]. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：726 / 730
页数：5
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