Economical phase-covariant cloning with multiclones
Zhang Wen-Hai(张文海)a)b)c)† and Ye Liu(叶柳)b)
a Department of Physics, Huainan Normal University, Huainan 232001, China; b School of Physics and Material Science, Anhui University, Hefei 230039, Chinac Department of Physics & Electronic Engineering, Hefei Teachers College, Hefei 230601, China
Abstract This paper presents a very simple method to derive the explicit transformations of the optimal economical 1 to M phase-covariant cloning. The fidelity of clones reaches the theoretic bound [D'Ariano G M and Macchiavello C 2003 Phys. Rev. A 67 042306]. The derived transformations cover the previous contributions [Delgado Y, Lamata L et al, 2007 Phys. Rev. Lett.98 150502] in which M must be odd.
Received: 19 November 2008
Revised: 23 December 2008
Accepted manuscript online:
PACS:
03.67.-a
(Quantum information)
Fund: Project
supported by the National Natural Science Foundation of China (Grant
No 10674001), and the Program of the Education Department of Anhui
Province of China (Grant No KJ2007A002).
Cite this article:
Zhang Wen-Hai(张文海) and Ye Liu(叶柳) Economical phase-covariant cloning with multiclones 2009 Chin. Phys. B 18 3702
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