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Quantum Fisher information in a strange metal
Federico Mazza1, Sounak Biswas2, Xinlin Yan1
1Institute of Solid State Physics, TU Wien, Vienna, Austria.
Nature Physics
|August 1, 2026
Summary
Quantum Fisher information reveals insights into strange metals, exotic quantum matter. This quantum state exhibits high multipartite entanglement, clarifying the microscopic origins of strange metallicity.
Area of Science:
- Condensed matter physics
- Quantum matter
- Quantum metrology
Background:
- Strange metals are exotic states of correlated quantum matter.
- Understanding the microscopic basis of strange metallicity is a key challenge.
- Heavy-fermion compounds are a prominent platform for studying strange metals.
Purpose of the Study:
- To investigate the potential of quantum Fisher information as a tool to understand strange metals.
- To explore the quantum critical fluctuations underlying strange metal behavior in heavy-fermion compounds.
Main Methods:
- Inelastic neutron scattering
- Quantum Monte Carlo simulations
- Calculation of quantum Fisher information
Main Results:
- Observed strong increase in quantum Fisher information as strange metal forms.
- Found no characteristic scale associated with the increase in quantum Fisher information.
- Demonstrated a link between quantum Fisher information and quantum critical fluctuations of the Kondo destruction type.
Conclusions:
- Quantum Fisher information provides a valuable descriptor of strange metallicity.
- The observed behavior indicates a quantum state with high multipartite entanglement.
- This approach offers a new direction for studying strange metal platforms.
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