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

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19 Citations (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.

Original language	Undefined/Unknown
Journal	Physical Review A (Atomic, Molecular and Optical Physics)
Volume	86
Issue number	5
Pages (from-to)	042108
Number of pages	1
ISSN	2469-9926
DOIs	https://doi.org/10.1103/PhysRevA.86.042108
Publication status	Published - 8 Oct 2012

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10.1103/PhysRevA.86.042108

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Cite this

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AU - Vogel, W.

AU - Christensen, Stefan Lund

AU - Béguin, J.-B.

AU - Appel, J.

AU - Polzik, E. S.

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N2 - 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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