Quantification of Entanglement from Magnetic Susceptibility for a Heisenberg Spin 1/2 system

TL;DR

This paper demonstrates how magnetic susceptibility measurements of a Heisenberg spin-1/2 chain system can be used to quantify entanglement, linking macroscopic magnetic properties to quantum correlations.

Contribution

It introduces a method to extract entanglement from experimental magnetic susceptibility data in a Heisenberg spin chain system, validated by fitting to the Bonner-Fisher model.

Findings

Magnetic susceptibility reveals signatures of infinite spin chain behavior.

Entanglement can be quantified from susceptibility data.

Experimental data aligns with theoretical models.

Abstract

Temperature and magnetic field dependent magnetization and extraction of entanglement from the experimental data is reported for dichloro(thiazole)copper(II), a Heisenberg spin chain system. The magnetic susceptibility vs. temperature plot exhibits signature of infinite spin chain. Isothermal magnetization measurements (as a function of magnetic field) were performed at various temperatures below the antiferromagnetic (AFM) ordering, where the AFM correlations persist significantly. These magnetization curves are fitted to the theoretically generated Bonner-Fisher model. Magnetic susceptibility can be used as a macroscopic witness of entanglement; using which entanglement is extracted from the experimentally measured magnetic data.