Quadrature squeezed cylindrically polarized modes contain entanglement not only in the polarization and spatial electric field variables but also between these two degrees of freedom [1]. In this paper we present tools to generate and detect this entanglement. Experimentally we demonstrate the generation of quadrature squeezing in cylindrically polarized modes by mode transforming a squeezed Gaussian mode. Specifically, -1.2 dB of amplitude squeezing are achieved in the radially and azimuthally polarized mode. Furthermore, theoretically it is shown how the entanglement contained within these modes can be measured and how strong the quantum correlations, depending on the measurement scheme, are.
@article{arxiv.1112.3534,
title = {Tools for detecting entanglement between different degrees of freedom in quadrature squeezed cylindrically polarized modes},
author = {Christian Gabriel and Andrea Aiello and Stefan Berg-Johansen and Christoph Marquardt and Gerd Leuchs},
journal= {arXiv preprint arXiv:1112.3534},
year = {2015}
}