Entanglement Conditions Involving Intensity Correlations of Optical Fields: the Case of Multi-Port Interferometry

@article{Ryu2017EntanglementCI,
  title={Entanglement Conditions Involving Intensity Correlations of Optical Fields: the Case of Multi-Port Interferometry},
  author={Junghee Ryu and Marcin Marciniak and Marcin Wie'sniak and Dagomir Kaszlikowski and Marek Żukowski},
  journal={Acta Physica Polonica A},
  year={2017},
  volume={132},
  pages={1713-1718}
}
Normalized quantum Stokes operators introduced in [Phys. Rev. A {\bf 95}, 042113 (2017)] enable one to better observe non-classical correlations of entangled states of optical fields with undefined photon numbers. For a given run of an experiment the new quantum Stokes operators are defined by the differences of the measured intensities (or photon numbers) at the exits of a polarizer divided by their sum. It is this ratio that is to be averaged, and not the numerator and the denominator… 
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