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Type: Artigo de periódico
Title: Genuine multipartite entanglement in quantum phase transitions
Author: de Oliveira, TR
Rigolin, G
de Oliveira, MC
Abstract: We demonstrate that the global-entanglement (GE) measure defined by Meyer and Wallach [J. Math. Phys. 43, 4273 (2002)] is maximal at the critical point for the Ising chain in a transverse magnetic field. Our analysis is based on the equivalence of GE to the averaged linear entropy, allowing an understanding of multipartite entanglement (ME) features through a generalization of GE for bipartite blocks of qubits. Moreover, in contrast to GE, the proposed ME measure can distinguish three paradigmatic entangled states: GHZ(N) (Greenberger-Horne-Zeilinger), W-N, and EPRcircle times N/2. As such the generalized measure can detect a genuine ME and is maximal at the critical point.
Country: EUA
Editor: American Physical Soc
Citation: Physical Review A. American Physical Soc, v. 73, n. 1, 2006.
Rights: aberto
Identifier DOI: 10.1103/PhysRevA.73.010305
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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