Multipartite entanglement transfer in spin chains

•Multipartite entanglement transfer.•Spin chains for quantum information tasks.•Many-body dynamics in quadratic models.•Perturbative analysis of weak-coupling dynamics. We investigate the transfer of genuine multipartite entanglement across a spin-12 chain with nearest-neighbour XX-type interaction....

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Bibliographic Details
Published in:Physics letters. A 2020-05, Vol.384 (15), p.126306, Article 126306
Main Authors: Apollaro, Tony J.G., Sanavio, Claudio, Chetcuti, Wayne Jordan, Lorenzo, Salvatore
Format: Article
Language:English
Subjects:
Multipartite entanglement
Perturbative dynamics
Quantum spin chains
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Summary:•Multipartite entanglement transfer.•Spin chains for quantum information tasks.•Many-body dynamics in quadratic models.•Perturbative analysis of weak-coupling dynamics. We investigate the transfer of genuine multipartite entanglement across a spin-12 chain with nearest-neighbour XX-type interaction. We focus on the perturbative regime, where a block of spins is weakly coupled at each edge of a quantum wire, embodying the role of a multiqubit sender and receiver, respectively. We find that high-quality multipartite entanglement transfer is achieved at the same time that three excitations are transferred to the opposite edge of the chain. Moreover, we find that both a finite concurrence and tripartite negativity is attained at much shorter time, making GHZ-distillation protocols feasible. Finally, we investigate the robustness of our protocol with respect to non-perturbative couplings and increasing lengths of the quantum wire.
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2020.126306