Quantum Fisher information and skew information correlations in dipolar spin system

TL;DR

This paper investigates how dipolar and Dzyaloshinsky-Moriya interactions influence quantum Fisher information and skew information in a dipolar spin-1/2 system, highlighting the effects on quantum correlations at thermal equilibrium.

Contribution

It analyzes the impact of dipolar and DM interactions on quantum correlations using QFI and SI in a bipartite spin system, revealing how these interactions affect quantum resources.

Findings

DM interaction enhances quantum correlations

Temperature reduces quantum correlations

Dipolar coupling constants significantly influence quantum measures

Abstract

Quantum Fisher information (QFI) and skew information (SI) plays a key role in the quantum resource theory. Understanding these measures in the physical system has practical significance in the state parameter estimation and quantum metrology. In this article, we consider a pair ofspin-1/2 particles coupled with dipolar and Dzyaloshinsky-Moriya (DM) interactions, serving as the physical carrier of quantum information. We examine the bipartite nonlocal correlations of pair of spin-1/2 particle system for the thermal equilibrium states, characterized by local quantum uncertainty (LQU) and local quantum Fisher information (lQFI). The effects of dipolar coupling constants on quantum correlation quantifiers are studied. The DM interaction greatly enhances the quantum correlation in the system whereas the temperature tends to annihilate the amount of quantum correlations.