Experimental Quantum Cloning of Single Photons

@article{LamasLinares2002ExperimentalQC,
  title={Experimental Quantum Cloning of Single Photons},
  author={Antia Lamas-Linares and Christoph Simon and John C. Howell and Dirk Bouwmeester},
  journal={Science},
  year={2002},
  volume={296},
  pages={712 - 714}
}
Although perfect copying of unknown quantum systems is forbidden by the laws of quantum mechanics, approximate cloning is possible. A natural way of realizing quantum cloning of photons is by stimulated emission. In this context, the fundamental quantum limit to the quality of the clones is imposed by the unavoidable presence of spontaneous emission. In our experiment, a single input photon stimulates the emission of additional photons from a source on the basis of parametric down-conversion… 
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