Eur. Phys. J. B (2012) 85: 83
https://doi.org/10.1140/epjb/e2012-21046-y

Regular Article

Quantum correlation in one-dimensional extended quantum compass model

School of Physical Science and Technology, Soochow University, Suzhou, Jiangsu 215006, P.R. China

^a e-mail: wlyou@suda.edu.cn

Received: 19 December 2011
Received in final form: 26 January 2012
Published online: 29 February 2012

Abstract

We study the correlations in the one-dimensional extended quantum compass model in a transverse magnetic field. By exactly solving the Hamiltonian, we find that the quantum correlation of the ground state of one-dimensional quantum compass model is vanishing. We show that quantum discord can not only locate the quantum critical points, but also discern the orders of phase transitions. Furthermore, entanglement quantified by concurrence is also compared.