Quantum Correlation in One-dimensional Extend Quantum Compass Model

TL;DR

This paper investigates quantum correlations in a one-dimensional extended quantum compass model, demonstrating how quantum discord and entanglement reveal critical points and phase transition orders.

Contribution

It provides an exact solution showing quantum discord's effectiveness in detecting quantum criticality and phase transition characteristics in the model.

Findings

Quantum correlation in the ground state vanishes.

Quantum discord locates critical points and identifies phase transition orders.

Entanglement is also analyzed and compared.

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.