Economical phase-covariant cloning with multiclones
Wen‐Hai Zhang, Ye Liu · Chinese Physics B · 2009
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.