Criticality, factorization, and long-range correlations in the anisotropic XY model

@article{Campbell2013CriticalityFA,
  title={Criticality, factorization, and long-range correlations in the anisotropic XY model},
  author={Steve Campbell and Jonathan G. Richens and Nicola Lo Gullo and Thomas Busch},
  journal={Physical Review A},
  year={2013},
  volume={88},
  pages={062305}
}
We study the long-range quantum correlations in the anisotropic XY-model. By first examining the thermodynamic limit we show that employing the quantum discord as a figure of merit allows one to capture the main features of the model at zero temperature. Further, by considering suitably large site separations we find that these correlations obey a simple scaling behavior for finite temperatures, allowing for efficient estimation of the critical point. We also address ground-state factorization… 

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