Thermal entanglement in a two-qubit Ising chain subjected to Dzialoshinski-Moriya interaction

TL;DR

This paper investigates how Dzialoshinski-Moriya interaction influences thermal entanglement in a two-qubit Ising chain under magnetic field, highlighting conditions for sustaining entanglement at higher temperatures.

Contribution

It demonstrates that longitudinal DM interaction enhances thermal entanglement and is more effective for control compared to perpendicular DM interaction.

Findings

Longitudinal DM interaction sustains entanglement at higher temperatures.

Perpendicular DM interaction is less effective for entanglement control.

Magnetic field and DM interaction strength significantly affect entanglement.

Abstract

Thermal entanglement of a two-qubit Ising chain subjected to an external magnetic field and Dzialoshinski-Moriya (DM) interaction is examined. The effect of magnetic field, strength of DM interaction and temperature are analyzed by adopting negativity of partial transpose as the measure of entanglement. It is shown that when the DM interaction along the Ising axis is considerable, thermal entanglement can be sustained for higher temperature. The usefulness of longitudinal DM interaction over the one that is perpendicular to the Ising axis, in the manipulation and control of entanglement at a feasible temperature, is illustrated.