Critical point estimation and long-range behavior in the one-dimensional XY model using thermal quantum and total correlations
Çakmak, Barış and Karpat, Göktuğ and Gedik, Zafer (2012) Critical point estimation and long-range behavior in the one-dimensional XY model using thermal quantum and total correlations. Physics Letters A, 376 (45). pp. 2982-2988. ISSN 0375-9601
Official URL: http://dx.doi.org/10.1016/j.physleta.2012.09.007
We investigate the thermal quantum and total correlations in the anisotropic XY spin chain in transverse field. While we adopt concurrence and geometric quantum discord to measure quantum correlations, we use measurement-induced non-locality and an alternative quantity defined in terms of Wigner–Yanase information to quantify total correlations. We show that the ability of these measures to estimate the critical point at finite temperature strongly depend on the anisotropy parameter of the Hamiltonian. We also identify a correlation measure which detects the factorized ground state in this model. Furthermore, we study the effect of temperature on long-range correlations.
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