Measuring multipartite entanglement via dynamic susceptibilities

Tools

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)

[thumbnail of Hauke-etal-NP2016-measuring-multipartite-entanglement-dynamic-susceptibilities]
Preview
 Text. Filename: Hauke_etal_NP2016_measuring_multipartite_entanglement_dynamic_susceptibilities.pdf
Accepted Author Manuscript
Download (743kB)| Preview

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 logoORCID: https://orcid.org/0000-0002-5858-1587 and Zoller, Peter;
  • 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:14 Feb 2025 03:44
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/55904
CORE (COnnecting REpositories)