Atomic nonclassicality quasiprobabilities
Quantum Physics
2012-10-09 v2
Abstract
Although nonclassical quantum states are important both conceptually and as a resource for quantum technology, it is often difficult to test whether a given quantum system displays nonclassicality. A simple method to certify nonclassicality is introduced, based on easily accessible collective atomic quadrature measurements, without the need of full state tomography. The statistics is analyzed beyond the ground-state noise level, by direct sampling of a regularized atomic quadrature quasiprobability. Nonclassicality of a squeezed ensemble of 2x10^5 Cesium atoms is demonstrated, with a significance of up to 23 standard deviations.
Cite
@article{arxiv.1207.3314,
title = {Atomic nonclassicality quasiprobabilities},
author = {T. Kiesel and W. Vogel and S. L. Christensen and J. -B. Béguin and J. Appel and E. S. Polzik},
journal= {arXiv preprint arXiv:1207.3314},
year = {2012}
}
Comments
5 pages, 2 figures