Finite-temperature mutual information in a simple phase transition

Details Finite-temperature mutual information in a simple phase transition Finite-temperature mutual information in a simple phase transition

2011-11-22

arxiv.org/abs/1111.5225v2

J. Stat. Mech. P01023 (2012)

Physics

Condensed Matter

Statistical Mechanics

12 pages, 9 figures, published version

Scientific paper

10.1088/1742-5468/2012/01/P01023

We study the finite-temperature behavior of the Lipkin-Meshkov-Glick model, with a focus on correlation properties as measured by the mutual information. The latter, which quantifies the amount of both classical and quantum correlations, is computed exactly in the two limiting cases of vanishing magnetic field and vanishing temperature. For all other situations, numerical results provide evidence of a finite mutual information at all temperatures except at criticality. There, it diverges as the logarithm of the system size, with a prefactor that can take only two values, depending on whether the critical temperature vanishes or not. Our work provides a simple example in which the mutual information appears as a powerful tool to detect finite-temperature phase transitions, contrary to entanglement measures such as the concurrence.

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