We present an experimentally practical method to reveal Einstein-Podolsky-Rosen steering in non-Gaussian spin states by exploiting a connection to quantum metrology. Our criterion is based on the quantum Fisher information, and uses bounds derived from generalized spin-squeezing parameters that involve measurements of higher-order moments. This leads us to introduce the concept of conditional spin-squeezing parameters, which quantify the metrological advantage provided by conditional states, as well as detect the presence of an EPR paradox.
@article{arxiv.2106.13106,
title = {Detecting Einstein-Podolsky-Rosen steering in non-Gaussian spin states from conditional spin-squeezing parameters},
author = {Jiajie Guo and Feng-Xiao Sun and Daoquan Zhu and Manuel Gessner and Qiongyi He and Matteo Fadel},
journal= {arXiv preprint arXiv:2106.13106},
year = {2023}
}