General mapping of multiqudit entanglement conditions to nonseparability indicators for quantum-optical fields

@article{Ryu2019GeneralMO,
  title={General mapping of multiqudit entanglement conditions to nonseparability indicators for quantum-optical fields},
  author={Junghee Ryu and Bianka Woloncewicz and Marcin Marciniak and Marcin Wiesniak and Marek Żukowski},
  journal={Physical Review Research},
  year={2019}
}
We show that any multi-qudit entanglement witness leads to a non-separability indicator for quantum optical fields, which involves intensity correlations. We get, e.g., necessary and sufficient conditions for intensity or intensity-rate correlations to reveal polarization entanglement. We also derive separability conditions for experiments involving multiport interferometers, now feasible with integrated optics. We show advantages of using intensity rates rather than intensities, e.g., a… 
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