Entanglement between Identical Particles Is a Useful and Consistent Resource

Morris, Benjamin and Yadin, Benjamin and Fadel, Matteo and Zibold, Tilman and Treutlein, Philipp and Adesso, Gerardo. (2020) Entanglement between Identical Particles Is a Useful and Consistent Resource. Physical Review X, 10 (4). 041012.

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Official URL: https://edoc.unibas.ch/78994/

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The existence of fundamentally identical particles represents a foundational distinction between classical and quantum mechanics. Because of their exchange symmetry, identical particles can appear to be entangled - another uniquely quantum phenomenon with far-reaching practical implications. However, a long-standing debate has questioned whether identical particle entanglement is physical or merely a mathematical artifact. In this work, we provide such particle entanglement with a consistent theoretical description as a quantum resource in processes frequently encountered in optical and cold atomic systems. This leads to a plethora of applications of immediate practical impact. On the one hand, we show that the metrological advantage for estimating phase shifts in systems of identical bosons amounts to a measure of their particle entanglement, with a clear-cut operational meaning. On the other hand, we demonstrate in general terms that particle entanglement is the property resulting in directly usable mode entanglement when distributed to separated parties, with particle conservation laws in play. Application of our tools to an experimental implementation with Bose-Einstein condensates leads to the first quantitative estimation of identical particle entanglement. Further connections are revealed between particle entanglement and other resources such as optical nonclassicality and quantum coherence. Overall, this work marks a resolutive step in the ongoing debate by delivering a unifying conceptual and practical understanding of entanglement between identical particles.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentelle Nanophysik (Treutlein)
UniBasel Contributors:Treutlein, Philipp and Fadel, Matteo and Zibold, Tilman
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article -- Additional publication or translation in: https://arxiv.org/abs/1908.11735
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Last Modified:21 Apr 2021 14:54
Deposited On:21 Apr 2021 14:51

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