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

• URL: http://arxiv.org/abs/2512.06718v1
• Date: Sun, 07 Dec 2025 08:12:16 GMT
• Title: Witnessing Spin-Orbital Entanglement using Resonant Inelastic X-Ray Scattering
• Authors: Zecheng Shen, Shuhan Ding, Zijun Zhao, Francesco A. Evangelista, Yao Wang,
• Abstract summary: Entanglement plays a central role in quantum technologies, yet its characterization and control in materials remain challenging.<n>Recent developments in spectrum-based entanglement witnesses have enabled new strategies for quantifying many-body entanglement in macroscopic materials.<n>We develop a protocol for detecting spin--orbital entanglement using experiment-accessible resonant inelastic x-ray scattering (RIXS)
• Score: 2.3299207193498583
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: 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, we develop a protocol for detecting spin--orbital entanglement using experiment-accessible resonant inelastic x-ray scattering (RIXS). Central to our approach is the construction of a Hermitian generator from experimentally 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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