Computable measure of nonclassicality for light.

@article{Asbth2005ComputableMO,
  title={Computable measure of nonclassicality for light.},
  author={J{\'a}nos K. Asb{\'o}th and John Calsamiglia and Helmut Ritsch},
  journal={Physical review letters},
  year={2005},
  volume={94 17},
  pages={
          173602
        }
}
We propose the entanglement potential (EP) as a measure of nonclassicality for quantum states of a single-mode electromagnetic field. It is the amount of two-mode entanglement that can be generated from the field using linear optics, auxiliary classical states, and ideal photodetectors. The EP detects nonclassicality, has a direct physical interpretation, and can be computed efficiently. These three properties together make it stand out from previously proposed nonclassicality measures. We… 

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