On the negativity of the Wigner function as a measure of entanglement under quantum polarization converter devices

TL;DR

This paper investigates how the Negativity of Wigner Function (NWF) can serve as an indicator of non-Gaussian entanglement in quantum states affected by polarization converters, comparing it with other entanglement measures.

Contribution

It demonstrates that NWF effectively quantifies non-Gaussian entanglement and compares its behavior with other entanglement measures in specific quantum states.

Findings

NWF correlates with non-Gaussian entanglement measures.

NWF can be used as a quantifier of non-Gaussian entanglement.

Comparison shows NWF's effectiveness relative to other measures.

Abstract

We study the behaviour of the Negativity of Wigner Function (NWF) as a measure of entanglement in non-Gaussian states under quantum polarisation converter devices. We analyze comparatively this quantity with other measures of entanglement in a system prepared in a superposition of two-mode coherent states. We show that the (WF) can be identified as a quantifier of non-Gaussian entanglement.