Generating entanglement between spatially separated regions within solid materials is now possible using a new resonant inelastic X-ray scattering technique developed by Chunjing Jia, Valentin Walther, and Laimei Nie from the University of Florida and Purdue University. An interferometric method splits incident X-rays to illuminate opposite sides of a sample; recombining these scattered photons projects the material into entangled states like Bell states or fractionalized spins depending on its properties. This process creates entanglement, a quantum link between particles, within solid materials using X-rays; unlike previous approaches that manipulate individual atoms or defects, this technique focuses on how photons scatter during observation.

Splitting incoming X-rays to illuminate opposite sides of a sample then recombining them allows projection of the material into entangled states like linked spins depending on its properties. Unlike previous methods focused on manipulating individual atoms or defects, this approach examines photon scattering when they interact with a material; it’s akin to shining an x-ray light onto a substance and analysing what bounces off to understand its internal structure.

The team splits incoming X-rays to illuminate opposite sides of a sample before recombining them, effectively projecting the material into entangled states like linked spins depending on its properties. This process is similar to splitting a single photon into two, detecting one instantly reveals information about the other, but applied across spatially separated regions of matter. The researchers now aim to demonstrate if this technique can be used as a set of tools for understanding complex quantum materials and their unique behaviours.

RIXS protocol establishes long-range solid-state entanglement exceeding prior limits

A new interferometric resonant inelastic X-ray scattering (RIXS) protocol coherently links spatially separated regions by splitting and recombining photons, an X-ray equivalent to the Duan-Lukin-Cirac-Zoller scheme used with atoms. Bell state creation from simple two-site models and entangled fractionalized spins within more complex spin chains like the Haldane chain were achieved, increasing middle-cut entanglement entropy by ln 2. Open tight binding chains serve as calibration tools for testing interferometer coherence via reflection parity of final states.

RIXS creates a quantum link between particles within solids; this established technique typically studies material properties but now actively manipulates quantum matter. Detector clicks herald coherent superpositions of excitations at opposite ends of the sample. While these results represent key progress, practical applications remain challenging because current experiments require precise control over X-ray beams and materials free from imperfections not yet fully attainable.

Resonant X-ray Scattering Provides A Scalable Route To Solid-State Entanglement

Solid-state quantum materials offer a promising platform for scalable entanglement generation, avoiding isolating individual atoms or defects as seen in nitrogen-vacancy centres and semiconductor dots; however, maintaining coherence during photon scattering presents significant hurdles that existing experimental setups have yet to overcome. This theoretical work charts a new path toward entanglement using readily available solid materials. Unlike approaches needing isolated atoms or defects, this scheme leverages established resonant inelastic X-ray scattering techniques offering potential scalability if these challenges can be addressed. The team’s framework relies on achieving precise control over X-ray beams. Researchers from the University of Florida and Purdue University pioneered a method to generate entanglement within solids using X-rays. RIXS, traditionally used for analysing material characteristics, has been repurposed into an interferometric protocol coherently linking spatially separated regions via photons; it mirrors atomic physics schemes but applies directly to solids rather than individual atoms or defects.

Researchers demonstrated that resonant inelastic X-ray scattering (RIXS) could create entangled states in solid materials by splitting and recombining X-ray photons illuminating opposite ends of a sample. This approach generates coherent superpositions of excitations, effectively linking quantum properties across distances within the material, and successfully created Bell states from simple models while increasing entanglement entropy in more complex spin chains.

The work shows RIXS can be adapted beyond analysis, actively manipulating quantum matter without requiring isolated atoms or defects as other methods do. Achieving this relies on precise control over X-ray beams, which presents ongoing experimental challenges.

👉 More information
🗞 Generating entanglement in quantum matter with pathway-entangled photons via resonant inelastic X-ray scattering
✍️ Chunjing Jia (University of Florida); Valentin Walther and Laimei Nie (Purdue University)
🧠 ArXiv: https://arxiv.org/abs/2610.32936

More like this