Experimental demonstration of probabilistic quantum cloning.

@article{Chen2011ExperimentalDO,
  title={Experimental demonstration of probabilistic quantum cloning.},
  author={Hongwei Chen and Dawei Lu and Bo Chong and Gan Qin and Xianyi Zhou and Xinhua Peng and Jiangfeng Du},
  journal={Physical review letters},
  year={2011},
  volume={106 18},
  pages={
          180404
        }
}
The method of quantum cloning is divided into two main categories: approximate and probabilistic quantum cloning. The former method is used to approximate an unknown quantum state deterministically, and the latter can be used to faithfully copy the state probabilistically. Thus far, many approximate cloning machines have been experimentally demonstrated, but probabilistic cloning remains an experimental challenge, as it requires more complicated networks and a higher level of precision control… 
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