TU Wien Researchers Find Entanglement in ‘Strange’ Metal

Researchers at TU Wien have demonstrated high multipartite quantum entanglement in a macroscopic centimetre-sized strange-metal crystal composed of cerium, palladium, and silicon. Using quantum Fisher information — a tool from quantum information theory — and neutron-scattering experiments at the ILL in Grenoble, the team showed that the crystal's response to neutron bombardment cannot be explained by independent particles. Instead, groups of at least nine quantum-entangled entities act collectively. The findings offer a potential explanation for strange metals' unusually low-noise electrical current and open a path toward applying strange metals in quantum metrology and other quantum technologies.