Witnessing Spin-Orbital Entanglement using Resonant Inelastic X-Ray Scattering
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866912753312071680 |
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| author | Shen, Zecheng Ding, Shuhan Zhao, Zijun Evangelista, Francesco A. Wang, Yao |
| author_facet | Shen, Zecheng Ding, Shuhan Zhao, Zijun Evangelista, Francesco A. Wang, Yao |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_06718 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Witnessing Spin-Orbital Entanglement using Resonant Inelastic X-Ray Scattering Shen, Zecheng Ding, Shuhan Zhao, Zijun Evangelista, Francesco A. Wang, Yao Quantum Physics Strongly Correlated Electrons 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. |
| title | Witnessing Spin-Orbital Entanglement using Resonant Inelastic X-Ray Scattering |
| topic | Quantum Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2512.06718 |