March 2025

Journal

Tutorial: Extracting entanglement signatures from neutron spectroscopy

By:
Scheie, Allen O; Laurell, Pontus Bengt Johan ; Simeth, Wolfgang J; Tennant, David A; Dagotto Mir, Elbio R
Journal Name:
Materials Today Quantum
Page Number:
100020
Volume:
5
Publication Date:
March 2025
View DOI Listing:
https://doi.org/10.1016/j.mtquan.2024.100020

Abstract

This tutorial is a pedagogical introduction to recent methods of computing quantum spin entanglement witnesses from spectroscopy, with a special focus on neutron scattering on quantum spin systems. We offer a brief introduction to the concepts and equations, define a data analysis protocol, and discuss the interpretation of three entanglement witnesses: one-tangle, two-tangle, and Quantum Fisher Information. We also discuss practical experimental considerations, and give three examples of extracting entanglement witnesses from experimental data: Copper Nitrate, KCuF3, and NiPS3.


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