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Optimal entanglement witnesses in a split spin-squeezed Bose-Einstein condensate

Oudot, Enky and Bancal, Jean-Daniel and Schmied, Roman and Treutlein, Philipp and Sangouard, Nicolas. (2017) Optimal entanglement witnesses in a split spin-squeezed Bose-Einstein condensate. Physical Review A, 95 (5). 052347.

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Official URL: http://edoc.unibas.ch/58167/

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Abstract

How do we detect quantum correlations in bipartite scenarios using a split many-body system and collective measurements on each party? We address this question by deriving entanglement witnesses using either only first-order or both first-and second-order moments of local collective spin components. In both cases, we derive optimal witnesses for spatially split spin-squeezed states in the presence of local white noise. We then compare the two optimal witnesses with respect to their resistance to various noise sources operating either at the preparation or at the detection level. We finally evaluate the statistics required to estimate the value of these witnesses when measuring a split spin-squeezed Bose-Einstein condensate. Our results can be seen as a step toward Bell tests with many-body systems.
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 Oudot, Enky and Bancal, Jean-Daniel and Schmied, Roman and Sangouard, Nicolas
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
ISSN:2469-9926
e-ISSN:2469-9934
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:28 Dec 2017 10:21
Deposited On:28 Dec 2017 10:21

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