# 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}
}
• Published 1 December 2017
• Physics
• Acta Physica Polonica A
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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