期刊
NATURE PHYSICS
卷 12, 期 8, 页码 778-782出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS3700
关键词
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资金
- EU IP SIQS
- SFB FoQuS (FWF Project) [F4016-N23]
- ERC synergy grant UQUAM
- Deutsche Akademie der Naturforscher Leopoldina [LPDS 2013-07, LPDR 2015-01]
- Spanish Government Grant FOQUS
- ERC AdG OSYRIS
- EU STREP EQuaM
- EU FET Proactive QUIC
Entanglement is considered an essential resource in quantum technologies, and central to the understanding of quantum many body physics. Developing protocols to detect and quantify the entanglement of many-particle quantum states is thus a key challenge for present experiments. Here, we show that the quantum Fisher information, a witness for genuinely multipartite entanglement, becomes measurable for thermal ensembles by means of the dynamic susceptibility that is, with resources readily available in present cold atomic-gas and condensed-matter experiments. This establishes a connection between multipartite entanglement and many-body correlations contained in response functions, with immediate implications close to quantum phase transitions, where the quantum Fisher information becomes universal, allowing us to identify strongly entangled phase transitions with a divergent multipartite entanglement. We illustrate our framework using paradigmatic quantum lsing models, and point out potential signatures in optical-lattice experiments and strongly correlated materials.
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