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.

  • Item type:Article
    ID code:55904
    Dates:
    Date
    Event
    30 August 2016
    Published
    21 March 2016
    Published Online
    19 February 2016
    Accepted
    5 September 2015
    Submitted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:15 Mar 2016 15:01
    Last modified:08 Apr 2024 22:42
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/55904
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