Surface entanglement in quantum spin networks

Stefano Zippilli, Salvatore Marco Giampaolo, and Fabrizio Illuminati
Phys. Rev. A 87, 042304 – Published 3 April 2013

Abstract

We study the ground-state entanglement in systems of spins forming the boundary of a quantum spin network in arbitrary geometries and dimensionality. We show that as long as they are weakly coupled to the bulk of the network, the surface spins are strongly entangled, even when distant and not directly interacting, thereby generalizing the phenomenon of long-distance entanglement occurring in quantum spin chains. Depending on the structure of the couplings between surface and bulk spins, we discuss in detail how the patterns of surface entanglement can range from multipair bipartite to fully multipartite. In the context of quantum information and communication, these results find immediate application to the implementation of quantum routers, that is, devices able to distribute quantum correlations on demand among multiple network nodes.

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  • Received 5 February 2013

DOI:https://doi.org/10.1103/PhysRevA.87.042304

©2013 American Physical Society

Authors & Affiliations

Stefano Zippilli, Salvatore Marco Giampaolo, and Fabrizio Illuminati

  • Dipartimento di Ingegneria Industriale, Università degli Studi di Salerno, Via Ponte don Melillo, I-84084 Fisciano (SA) Italy

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Issue

Vol. 87, Iss. 4 — April 2013

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