Atomic nonclassicality quasiprobabilities

T. Kiesel; W. Vogel; Stefan Lund Christensen; J.-B. Béguin; J. Appel; E. S. Polzik

doi:10.1103/PhysRevA.86.042108

Atomic nonclassicality quasiprobabilities

T. Kiesel, W. Vogel, Stefan Lund Christensen, J.-B. Béguin, J. Appel, E. S. Polzik

Kvanteoptik

19 Citationer (Scopus)

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 2×105 cesium atoms is demonstrated, with a significance of up to 23 standard deviations.

Originalsprog	Udefineret/Ukendt
Tidsskrift	Physical Review A (Atomic, Molecular and Optical Physics)
Vol/bind	86
Udgave nummer	5
Sider (fra-til)	042108
Antal sider	1
ISSN	2469-9926
DOI	https://doi.org/10.1103/PhysRevA.86.042108
Status	Udgivet - 8 okt. 2012

Adgang til dokumentet

10.1103/PhysRevA.86.042108

http://link.aps.org/doi/10.1103/PhysRevA.86.042108

Citationsformater

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AU - Christensen, Stefan Lund

AU - Béguin, J.-B.

AU - Appel, J.

AU - Polzik, E. S.

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AB - 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 2×105 cesium atoms is demonstrated, with a significance of up to 23 standard deviations.

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