Related Experiment Video
Updated: Jan 29, 2026
07:56
A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
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Intertwined orders in a quantum-entangled metal
Junyoung Kwon1, Jaehwon Kim1, Gwansuk Oh1
1Department of Physics, Pohang University of Science and Technology, Pohang, Korea.
Nature Materials
|January 27, 2026
Summary
Researchers quantitatively measured quantum entanglement in correlated materials using resonant inelastic X-ray scattering. This reveals a highly entangled electronic phase near a quantum metal-insulator transition, linking entanglement to unconventional orders.
Area of Science:
- Quantum Materials Science
- Condensed Matter Physics
- Quantum Information
Background:
- Characterizing quantum entanglement in correlated materials is crucial for quantum computing.
- Existing methods face challenges in quantitative assessment of entanglement.
- Understanding entanglement is key to unlocking novel quantum phenomena.
Purpose of the Study:
- To quantitatively characterize quantum entanglement in a correlated material system.
- To investigate the electronic phase near a quantum metal-insulator transition.
- To establish a framework linking entanglement to emergent orders.
Main Methods:
- Resonant inelastic X-ray scattering (RIXS) interferometry was employed.
- Theoretical modeling was used to capture interference patterns and reconstruct entanglement spectra.
- Raman spectroscopy was used for complementary investigations.
Main Results:
- A highly entangled electronic phase was identified near a quantum metal-insulator transition.
- Entanglement extending across atomic sites was quantitatively reconstructed.
- Evidence for coexisting symmetry-breaking orders, including a two-magnon bound state and split phonon modes, was found in Nd2Ir2O7.
Conclusions:
- A quantitative framework linking quantum entanglement to emergent unconventional orders was established.
- The study provides microscopic resolution of quantum states and their entanglement.
- Findings highlight the complex interplay of spin, orbital, charge, and magnetic order.
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