Cloning of symmetric d -level photonic states in physical systems

@article{Fan2002CloningOS,
  title={Cloning of symmetric d -level photonic states in physical systems},
  author={Heng Fan and Gregor Weihs and Keiji Matsumoto and Hiroshi Imai},
  journal={Physical Review A},
  year={2002},
  volume={66},
  pages={024307}
}
Optimal procedures play an important role in quantum information. It turns out that some naturally occurring processes as emission of light from an atom can realize optimal transformations. Here we study how arbitrary symmetric states of a number of d-level systems can be cloned using a multilevel atomic system. It is shown that optimality is always ensured even though the output number of systems is probabilistic. 
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