Experimental Bell inequality violation with an atom and a photon.

@article{Moehring2004ExperimentalBI,
  title={Experimental Bell inequality violation with an atom and a photon.},
  author={David L. Moehring and Martin Madsen and Boris B. Blinov and Christopher R. Monroe},
  journal={Physical review letters},
  year={2004},
  volume={93 9},
  pages={
          090410
        }
}
We report the measurement of a Bell inequality violation with a single atom and a single photon prepared in a probabilistic entangled state. This is the first demonstration of such a violation with particles of different species. The entanglement characterization of this hybrid system may also be useful in quantum information applications. 

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