We investigate the transfer of genuine multipartite entanglement across a spin-1/2 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.

Apollaro T.J.G., Sanavio C., Chetcuti W.J., Lorenzo S. (2020). Multipartite entanglement transfer in spin chains. PHYSICS LETTERS A, 384(15), 126306 [10.1016/j.physleta.2020.126306].

Multipartite entanglement transfer in spin chains

Lorenzo S.
2020-01-01

Abstract

We investigate the transfer of genuine multipartite entanglement across a spin-1/2 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.
Apollaro T.J.G., Sanavio C., Chetcuti W.J., Lorenzo S. (2020). Multipartite entanglement transfer in spin chains. PHYSICS LETTERS A, 384(15), 126306 [10.1016/j.physleta.2020.126306].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/406245
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