Quantum correlations in spin models
Abstract
Bell nonlocality, entanglement and nonclassical correlations are different aspects of quantum correlations for a given state. There are many methods to measure nonclassical correlations. In this paper, nonclassical correlations in two-qubit spin models are measured by use of measurement-induced disturbance (MID) [Phys. Rev. A, 77, 022301 (2008)] and geometric measure of quantum discord (GQD) [Phys. Rev. Lett. 105, 190502 (2010)]. Their dependencies on external magnetic field, spin-spin coupling, and Dzyaloshinski-Moriya (DM) interaction are presented in detail. We also compare Bell nonlocality, entanglement measured by concurrence, MID and GQD and illustrate their different characteristics.
Keywords
Cite
@article{arxiv.1105.2866,
title = {Quantum correlations in spin models},
author = {Guo-Feng Zhang and Heng Fan and Ai-Ling Ji and Zhao-Tan Jiang and Ahmad Abliz and Wu-Ming Liu},
journal= {arXiv preprint arXiv:1105.2866},
year = {2015}
}
Comments
1 text and 5 eps figures, accepted by Annals of Physics