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Bell correlations in a Bose-Einstein condensate

Schmied, Roman and Bancal, Jean-Daniel and Allard, Baptiste and Fadel, Matteo and Scarani, Valerio and Treutlein, Philipp and Sangouard, Nicolas. (2016) Bell correlations in a Bose-Einstein condensate. Science, 352 (6284). pp. 441-444.

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Official URL: http://edoc.unibas.ch/52751/

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Abstract

Characterizing many-body systems through the quantum correlations between their constituent particles is a major goal of quantum physics. Although entanglement is routinely observed in many systems, we report here the detection of stronger correlations—Bell correlations—between the spins of about 480 atoms in a Bose-Einstein condensate. We derive a Bell correlation witness from a many-particle Bell inequality involving only one- and two-body correlation functions. Our measurement on a spin-squeezed state exceeds the threshold for Bell correlations by 3.8 standard deviations. Our work shows that the strongest possible nonclassical correlations are experimentally accessible in many-body systems and that they can be revealed by collective measurements.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentelle Nanophysik (Treutlein)
05 Faculty of Science > Departement Physik > Physik > Quantum Physics (Sangouard)
UniBasel Contributors:Treutlein, Philipp and Schmied, Roman and Bancal, Jean-Daniel and Allard, Baptiste and Fadel, Matteo and Sangouard, Nicolas
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Association for the Advancement of Science
ISSN:0036-8075
e-ISSN:1095-9203
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:01 Nov 2018 16:21
Deposited On:15 Feb 2017 13:39

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