Long-distance genuine multipartite entanglement between magnetic defects in spin chains

We investigate the emergence and properties of long-distance genuine multipartite entanglement, induced via three localized magnetic defects, in a one-dimensional transverse-field $XX$ spin-$1/2$ chain. Using both analytical and numerical techniques, we determine the conditions for the existence of bound states localized at the defects. We find that the reduced density matrix (RDM) of the defects exhibits long-distance genuine multipartite entanglement (GME) across the whole range of the Hamiltonian parameter space, including regions where the two-qubit concurrence is zero. We quantify the entanglement by using numerical lower bounds for the GME concurrence, as well as by analytically deriving the GME concurrence in regions where the RDM is of rank 2. Our work provides insights into generating multipartite entanglement in many-body quantum systems via local control techniques.

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Publication Details

Journal
Physical review. A/Physical review, A
Published
2025-03-28
DOI
https://doi.org/10.1103/physreva.111.032434
Citations
1
Primary Topic
Quantum many-body systems
Type
article
Field-Weighted Citation Impact
1.25

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article

Long-distance genuine multipartite entanglement between magnetic defects in spin chains

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1 citations
Physical review. A/Physical review, A
Quantum many-body systems
1.25
article

Long-distance genuine multipartite entanglement between magnetic defects in spin chains

S. M. Giampaolo, Tony J. G. Apollaro, Fabio Franchini, Gianpaolo Torre, Riccarda Bonsignori, Mirko Consiglio, Marcin Wieśniak, Jovan Odavić
article en
1 citations

Abstract

We investigate the emergence and properties of long-distance genuine multipartite entanglement, induced via three localized magnetic defects, in a one-dimensional transverse-field $XX$ spin-$1/2$ chain. Using both analytical and numerical techniques, we determine the conditions for the existence of bound states localized at the defects. We find that the reduced density matrix (RDM) of the defects exhibits long-distance genuine multipartite entanglement (GME) across the whole range of the Hamiltonian parameter space, including regions where the two-qubit concurrence is zero. We quantify the entanglement by using numerical lower bounds for the GME concurrence, as well as by analytically deriving the GME concurrence in regions where the RDM is of rank 2. Our work provides insights into generating multipartite entanglement in many-body quantum systems via local control techniques.

Physical review. A/Physical review, AVol. 111(3)
University of Malta (MT), University of Gdańsk (PL), Graz University of Technology (AT), Istituto Nazionale di Fisica Nucleare, Sezione di Napoli (IT), Ruđer Bošković Institute (HR), University of Naples Federico II (IT)
Austrian Science Fund, Narodowe Centrum Nauki, Hrvatska Zaklada za Znanost, Ministero dell'Università e della Ricerca
Openalex Percentile: Top 23%
Quantum many-body systems
1.25
DOISourceOpenAlex
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