Measuring multipartite entanglement via dynamic susceptibilities
Hauke, Philipp and Heyl, Markus and Tagliacozzo, Luca and Zoller, Peter (2016) Measuring multipartite entanglement via dynamic susceptibilities. Nature Physics, 12. 778–782. ISSN 1745-2473 (https://doi.org/10.1038/NPHYS3700)
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Abstract
Entanglement plays a central role in our understanding of quantum many body physics, and is fundamental in characterising quantum phases and quantum phase transitions. Developing protocols to detect and quantify entanglement of many-particle quantum states is thus a key challenge for present experiments. Here, we show that the quantum Fisher information, representing a witness for genuinely multipartite entanglement, becomes measurable for thermal ensembles via the dynamic susceptibility, i.e., with resources readily available in present cold atomic gas and condensed-matter experiments. This moreover establishes a fundamental connection between multipartite entanglement and many-body correlations contained in response functions, with profound implications close to quantum phase transitions. There, the quantum Fisher information becomes universal, allowing us to identify strongly entangled phase transitions with a divergent multipartiteness of entanglement. We illustrate our framework using paradigmatic quantum Ising models, and point out potential signatures in optical-lattice experiments.
ORCID iDs
Hauke, Philipp, Heyl, Markus, Tagliacozzo, Luca ORCID: https://orcid.org/0000-0002-5858-1587 and Zoller, Peter;-
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Item type: Article ID code: 55904 Dates: DateEvent30 August 2016Published21 March 2016Published Online19 February 2016Accepted5 September 2015SubmittedSubjects: Science > Physics Department: Faculty of Science > Physics Depositing user: Pure Administrator Date deposited: 15 Mar 2016 15:01 Last modified: 11 Nov 2024 11:17 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/55904