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arXiv:1601.02750 · International Journal of Theoretical Physics

One-Way Deficit and Quantum Phase Transitions in XX Model

Yao-Kun Wang, Yu-Ran Zhang

Published Oct 23, 2017• 1 citation
arXivHTMLPDF
DOI
10.1007/s10773-017-3568-3

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Quantum deficit originates in questions regarding work extraction from quantum systems coupled to a heat bath [Phys. Rev. Lett. 89, 180402 (2002)]. It is a kind of quantum correlations besides entanglement and quantum discord, and links quantum thermodynamics with quantum correlations. In this paper, we evaluate the one-way deficit of two adjacent spins in the bulk for the XY model. We find that the one-way deficit characterizes the quantum phase transition in the XX model and the transverse field Ising model that the XY model reduces to for specified parameters. This study may enlighten extensive studies of quantum phase transitions from the perspective of quantum information and quantum correlations, including finite-temperature phase transitions, phase transitions of other quantum many-body models or even topological phase transitions.