Crystals (Feb 2019)

Identification of Unentangled–Entangled Border in the Luttinger Liquid Phase

  • Somayyeh Nemati,
  • Fatemeh Khastehdel Fumani,
  • Saeed Mahdavifar

DOI
https://doi.org/10.3390/cryst9020105
Journal volume & issue
Vol. 9, no. 2
p. 105

Abstract

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Quantum discord and entanglement are both criteria for distinguishing quantum correlations in a quantum system. We studied the effect of the transverse magnetic field on the quantum discord of the one-dimensional spin-1/2 XX model. This study focused on the pair of spins at different distances. We show that quantum discord is finite for all studied spin pairs in the Luttinger liquid phase. In addition, relying on our calculations, we show that the derivatives of quantum discord can be used to identify the border between entangled and separable regions in the Luttinger liquid phase.

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