Cloning a qutrit

@article{Cerf2002CloningAQ,
  title={Cloning a qutrit},
  author={Nicolas J. Cerf and Thomas Durt and Nicolas Gisin},
  journal={Journal of Modern Optics},
  year={2002},
  volume={49},
  pages={1355 - 1373}
}
Several classes of state-dependent quantum cloners for three-level systems are investigated. These cloners optimally duplicate some of the four maximally-conjugate bases with an equal fidelity, thereby extending the phasecovariant qubit cloner to qutrits. Three distinct classes of qutrit cloners can be distinguished, depending on whether two, three, or four maximally-conjugate bases are cloned as well (the latter case simply corresponds to the universal qutrit cloner). These results apply to… 
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