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

共 33 条

[1] Quantum computing with an always-on Heisenberg interaction [J].

Benjamin, SC ;

Bose, S .

PHYSICAL REVIEW LETTERS, 2003, 90 (24) :4

[2] Quantum communication through an unmodulated spin chain [J].

Bose, S .

PHYSICAL REVIEW LETTERS, 2003, 91 (20)

[3] Optimal universal and state-dependent quantum cloning [J].

Bruss, D ;

DiVincenzo, DP ;

Ekert, A ;

Fuchs, CA ;

Macchiavello, C ;

Smolin, JA .

PHYSICAL REVIEW A, 1998, 57 (04) :2368-2378

[4]

Bruss D, 2000, PHYS REV A, V62, DOI [10.1103/PhysRevA.62.062302, 10.1103/PhysRevA.62.012302]

[5] Quantum copying: Beyond the no-cloning theorem [J].

Buzek, V ;

Hillery, M .

PHYSICAL REVIEW A, 1996, 54 (03) :1844-1852

[6]

CHEN Q, QUANTPH0604204

[7] Perfect state transfer in quantum spin networks [J].

Christandl, M ;

Datta, N ;

Ekert, A ;

Landahl, AJ .

PHYSICAL REVIEW LETTERS, 2004, 92 (18) :187902-1

[8] Approximate quantum cloning with nuclear magnetic resonance [J].

Cummins, HK ;

Jones, C ;

Furze, A ;

Soffe, NF ;

Mosca, M ;

Peach, JM ;

Jones, JA .

PHYSICAL REVIEW LETTERS, 2002, 88 (18) :4

[9] Optimal phase-covariant cloning for qubits and qutrits [J].

D'Ariano, GM ;

Macchiavello, C .

PHYSICAL REVIEW A, 2003, 67 (04) :9

[10] Cloning transformations in spin networks without external control [J].

De Chiara, G ;

Fazio, R ;

Macchiavello, C ;

Montangero, S ;

Palma, GM .

PHYSICAL REVIEW A, 2005, 72 (01)

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