Multipartite quantum correlations in the frustrated and nonfrustrated regimes of a tunable triangular Ising system

TL;DR

This paper investigates multipartite quantum correlations in a tunable triangular Ising system, showing how MQC and its susceptibility can distinguish frustrated regimes and how anisotropic coupling modulates correlations, with implications for cold atom experiments.

Contribution

It introduces a combined MQC and susceptibility approach to identify frustrated regimes and explores anisotropic coupling as a control tool in a triangular Ising model.

Findings

MQC alone cannot distinguish frustrated regimes

MQC susceptibility effectively discriminates regimes

Anisotropic coupling modulates MQC in ground state

Abstract

We study the multipartite quantum correlation (MQC) in a quantum transverse Ising system with the tunable triangular configuration, where it is found that the MQC itself cannot always discriminate the frustrated and nonfrustrated regimes of the ground state but the MQC combined with our newly defined MQC susceptibility can complete the task. Meanwhile, we reveal that the spatially anisotropic coupling is an effective and feasible tool for the MQC modulation in the ground state of frustrated Ising spins. Furthermore, we analyze the multipartite correlation properties in the thermal state, where it is shown that, unlike the thermally fragile MQC in the nonfrustrated regimes, there is a three-way trade-off relation among high MQC, strong thermal robustness, and the spatially anisotropic interactions in the frustrated spins. In addition, an experimental scheme for the MQC modulation via the anisotropic coupling is discussed in the system of cold atoms trapped in an optical lattice.