Global quantum correlations in finite-size spin chains

Steve Campbell; L. Mazzola; G. De Chiara; T. J. G. Apollaro; F. Plastina; Th Busch; M. Paternostro

doi:10.1088/1367-2630/15/4/043033

Global quantum correlations in finite-size spin chains

Steve Campbell, L. Mazzola, G. De Chiara, T. J. G. Apollaro, F. Plastina, Th Busch, M. Paternostro

School of Mathematics and Physics

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Abstract

We perform an extensive study of the properties of global quantum correlations in finite-size one-dimensional quantum spin models at finite temperature. By adopting a recently proposed measure for global quantum correlations (Rulli and Sarandy 2011 Phys. Rev. A 84 042109), called global discord, we show that critical points can be neatly detected even for many-body systems that are not in their ground state. We consider the transverse Ising model, the cluster-Ising model where three-body couplings compete with an Ising-like interaction, and the nearest-neighbor XX Hamiltonian in transverse magnetic field. These models embody our canonical examples showing the sensitivity of global quantum discord close to criticality. For the Ising model, we find a universal scaling of global discord with the critical exponents pertaining to the Ising universality class.

Original language	English
Article number	043033
Number of pages	15
Journal	New Journal of Physics
Volume	15
DOIs	https://doi.org/10.1088/1367-2630/15/4/043033
Publication status	Published - 19 Apr 2013

Keywords

PHASE-TRANSITION
MODEL
ENTANGLEMENT
SIMULATOR
SYSTEMS
DISCORD
XY

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10.1088/1367-2630/15/4/043033Licence: CC BY

Global quantum correlations in finite-size spin chains
© IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. This is an open access article published under a Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
Final published version, 657 KBLicence: CC BY

Cite this

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AU - Mazzola, L.

AU - De Chiara, G.

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AU - Busch, Th

AU - Paternostro, M.

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KW - MODEL

KW - ENTANGLEMENT

KW - SIMULATOR

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Global quantum correlations in finite-size spin chains

Abstract

Keywords

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