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Entanglement Quantification in Atomic Ensembles

Fadel, Matteo and Usui, Ayaka and Huber, Marcus and Friis, Nicolai and Vitagliano, Giuseppe. (2021) Entanglement Quantification in Atomic Ensembles. Physical Review Letters, 127 (1). 010401.

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Official URL: https://edoc.unibas.ch/87539/

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Abstract

Entanglement measures quantify nonclassical correlations present in a quantum system, but can be extremely difficult to calculate, even more so, when information on its state is limited. Here, we consider broad families of entanglement criteria that are based on variances of arbitrary operators and analytically derive the lower bounds these criteria provide for two relevant entanglement measures: the best separable approximation and the generalized robustness. This yields a practical method for quantifying entanglement in realistic experimental situations, in particular, when only few measurements of simple observables are available. As a concrete application of this method, we quantify bipartite and multipartite entanglement in spin-squeezed Bose-Einstein condensates of similar to 500 atoms, by lower bounding the best separable approximation and the generalized robustness only from measurements of first and second moments of the collective spin operator.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentelle Nanophysik (Treutlein)
UniBasel Contributors:Fadel, Matteo
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
ISSN:0031-9007
e-ISSN:1079-7114
Note:Publication type according to Uni Basel Research Database: Journal article -- Additional publication or translation in: https://arxiv.org/abs/2103.15730
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Last Modified:11 Apr 2022 15:40
Deposited On:11 Apr 2022 15:40

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