Continuous-Variable Nonclassicality Detection under Coarse-Grained Measurement
Quantum Physics
2023-10-19 v1
Abstract
Coarse graining is a common imperfection of realistic quantum measurement, obstructing the direct observation of quantum features. Under highly coarse-grained measurement, we experimentally detect the continuous-variable nonclassicality of both Gaussian and non-Gaussian states. Remarkably, we find that this coarse-grained measurement outperforms the conventional fine-grained measurement for nonclassicality detection: it detects nonclassicality beyond the reach of the variance criterion, and furthermore, it exhibits stronger statistical significance than the high-order moments method. Our work shows the usefulness of coarse-grained measurement by providing a reliable and efficient way of nonclassicality detection for quantum technologies.
Cite
@article{arxiv.2212.14343,
title = {Continuous-Variable Nonclassicality Detection under Coarse-Grained Measurement},
author = {Chan Roh and Young-Do Yoon and Jiyong Park and Young-Sik Ra},
journal= {arXiv preprint arXiv:2212.14343},
year = {2023}
}