Witnessing Spin-Orbital Entanglement Using Resonant Inelastic X-Ray Scattering

Shen, Zecheng; Ding, Shuhan; Zhao, Zijun; Evangelista, Francesco A.; Wang, Yao

doi:10.1103/nyxb-nqtq

Title: Witnessing Spin-Orbital Entanglement Using Resonant Inelastic X-Ray Scattering

Journal Article · Fri Mar 20 00:00:00 UTC 2026 · Physical Review Letters

DOI: https://doi.org/10.1103/nyxb-nqtq · OSTI ID:3024887

Shen, Zecheng ^[1]; Ding, Shuhan ^[1];

^[1];

^[1]

Emory Univ., Atlanta, GA (United States)

Entanglement plays a central role in quantum technologies, yet its characterization and control in materials remain challenging. Recent developments in spectrum-based entanglement witnesses have enabled new strategies for quantifying many-body entanglement in macroscopic materials. Here, in this work, we develop a protocol for detecting spin-orbital entanglement using experiment-accessible resonant inelastic x-ray scattering. Central to our approach is the construction of a Hermitian generator from measurable spectra, which allows us to compute the quantum Fisher information (QFI) available in spin-orbital systems. The resulting QFI provides upper bounds for 𝑘-producible states and thus serves as a robust witness of spin-orbital entanglement. To account for realistic experimental limitations, we further extend our framework to include relaxed QFI bounds applicable to measurements lacking full polarization resolution.

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Research Organization:: Emory Univ., Atlanta, GA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-05CH11231; SC0024524; SC0024532

OSTI ID:: 3024887

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 11 Vol. 136; ISSN 1079-7114; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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