Overview
- Researchers at TU Wien, with theory partners at Rice University and the University of Würzburg, reported this result in Nature Physics on Wednesday after neutron‑scattering experiments at the Institut Laue‑Langevin in Grenoble.
- The team analyzed spin responses from a cerium‑palladium‑silicon strange‑metal crystal using quantum Fisher information, a metric that measures how sensitively a system reacts and can reveal multipartite entanglement without creating a macroscopic superposition.
- Data showed a collective response that cannot be explained by independent particles and indicates groups of at least nine entangled entities acting together within a hand‑sized crystal.
- The measured spin quantum Fisher information peaks at the material's quantum critical point, supporting the idea that enhanced entanglement is linked to the unusual transport and ‘strange‑metal’ behavior observed in these materials.
- Authors say this bridges quantum information theory and solid‑state experiment and could open studies of whether strange metals offer practical uses in quantum metrology, with follow‑up work planned to test generality across other materials and probes.