"Witnessing quantum spin entanglement with neutron spectroscopy."
ORAL · Invited
Abstract
I will discuss recent work on witnessing solid-state quantum spin entanglement with inelastic neutron spectroscopy. I will begin with an overview of entanglement witnesses and their connection to the magnetic structure factor, and then discuss several experimental examples of how entanglement information can be extracted from magnetic scattering. The most successful witness so far is Quantum Fisher Information (QFI), which bounds multipartite entanglement. I will then discuss how to interpret them using tractable quantum and semiclassical models, and how studying the momentum-dependence of QFI yields important information. Finally, I will discuss open questions and research directions in this new field.
*This work is supported by by the Quantum Science Center (QSC), a National Quantum Information Science Research Center of the U.S. Department of Energy (DOE), and the Laboratory Directed Research and Development program of Los Alamos National Laboratory under project number 20250836ECR.
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Publication: A. Scheie, P. Laurell, W. Simeth, E. Dagotto, and D. A. Tennant, Tutorial: Extracting entanglement signatures from neutron spectroscopy, Materials Today Quantum 5, 100020 (2025).
W. Simeth, P. Laurell, A. Scheie, in preparation.
Presenters
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Allen O Scheie
- Los Alamos National Laboratory (LANL)
- Los Alamos National Laboratory