Long-distance genuine multipartite Entanglement between Magnetic Defects in Spin Chains

Consiglio, Mirko; Odavić, Jovan; Bonsignori, Riccarda; Torre, Gianpaolo; Wieśniak, Marcin; Franchini, Fabio; Giampaolo, Salvatore Marco; Apollaro, Tony J. (2025) Long-distance genuine multipartite Entanglement between Magnetic Defects in Spin Chains. Physical Review A, 111 . ISSN 2469-9934

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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- 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 two. Our work provides insights into generating multipartite entanglement in many-body quantum systems via local control techniques.

Item Type:	Article
Uncontrolled Keywords:	Entanglement; Multipartite; Spin Chain; Quantum
Subjects:	NATURAL SCIENCES > Physics > Atomic and Molecular Physics NATURAL SCIENCES > Physics > Condensed Matter Physics
Divisions:	Theoretical Physics Division
Projects:	Project title Project leader Project code Project type Frustrirani kompleksni sustavi-FCS Salvatore Marco Giampaolo IP-2019-04-3321 HRZZ
Depositing User:	Fabio Franchini
Date Deposited:	26 Jan 2026 12:18
URI:	http://fulir.irb.hr/id/eprint/11085
DOI:	10.1103/PhysRevA.111.032434

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