Skip to content
DraconiticResearch
Search Sources API
197,768 studies31 sourcesUpdated 13 min ago
Peer-reviewedCC BYNature Physics

Quantum Fisher information in a strange metal

  • Federico Mazza1
  • Sounak Biswas2
  • Xinlin Yan1
  • Andrey Prokofiev1
  • P. Steffens3
  • Qimiao Si A4
  • Fakher F. Assaad2,5
  • Silke Buehler Paschen1
5 affiliations
  1. 1Institute of Solid State Physics, TU Wien, Vienna, Austria
  2. 2Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Würzburg, Germany
  3. 3Institut Laue-Langevin, Grenoble, France
  4. 4Department of Physics and Astronomy, Extreme Quantum Materials Alliance, Rice Laboratory for Emergent Magnetic Materials, Smalley-Curl Institute, Rice University, Houston, TX USA
  5. 5Würzburg-Dresden Cluster of Excellence ctd.qmat, Würzburg, Germany
Open at sourcePDFDOICite

Abstract

A strange metal is an exotic state of correlated quantum matter, and intensive efforts are ongoing to understand its nature. Here we show that the quantum Fisher information-a concept from quantum metrology-may provide helpful insights. We use inelastic neutron scattering and quantum Monte Carlo simulations to study quantum critical fluctuations of the Kondo destruction type, which are considered to underlie strange metal behaviour in heavy-fermion compounds. We find that the associated quantum Fisher information increases strongly and without a characteristic scale as the strange metal forms with decreasing temperature. This provides evidence for a quantum state with high multipartite entanglement and offers a positive descriptor of strange metallicity that points towards its microscopic basis. Our work opens a direction for future studies across a range of strange metal platforms.

Related

  1. Extended strange metal regime in a pure nematic quantum critical superconductor
    Kousuke Ishida, Kiyotaka Mukasa, Shusaku Imajo +12
    arXivPreprintarXiv licenceFull textCondensed matterarXiv
  2. Fermi-liquid versus non-Fermi-liquid/'strange-metal' fits to the electrical resistivity in the quantum critical magnetic regime of an unconventional superconductor
    William Knafo, T. Thebault, K. Somesh +4
    HALPreprintCC BYFull textCondensed matterHAL
  3. Evaluation of the quantum Fisher information for large systems via an ancilla
    Qi Liu, Xin-Yu Hao, Jing Liu
    arXivPreprintCC BY-NC-SA 4.0Full textQuantum physics & quantum informationarXiv
  4. Quantum Fisher information of the Klein--Gordon and Dirac vacua
    Preslav Asenov, Alessio Serafini
    arXivPreprintCC BY 4.0Full textHigh-energy & particle physicsQuantum physics & quantum informationarXiv
  5. Enhancing Quantum Metrology with High-order Fisher Information and Experiments
    Xin-Zhu Liu, Jun-Li Jiang, Yan-Han Yang +4
    arXivPreprintCC BY 4.0Full textQuantum physics & quantum informationarXiv

Cite

BibTeXRIS
BibTeX
@article{mazza2026quantum,
  title = {{Quantum Fisher information in a strange metal}},
  author = {Federico Mazza and Sounak Biswas and Xinlin Yan and Andrey Prokofiev and P. Steffens and Qimiao Si A and Fakher F. Assaad and Silke Buehler Paschen},
  journal = {Nature Physics},
  year = {2026},
  month = jun,
  doi = {10.1038/s41567-026-03298-0},
  url = {https://doi.org/10.1038/s41567-026-03298-0},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Quantum Fisher information in a strange metal
AU  - Federico Mazza
AU  - Sounak Biswas
AU  - Xinlin Yan
AU  - Andrey Prokofiev
AU  - P. Steffens
AU  - Qimiao Si A
AU  - Fakher F. Assaad
AU  - Silke Buehler Paschen
PY  - 2026
DA  - 2026/06/15
JO  - Nature Physics
DO  - 10.1038/s41567-026-03298-0
UR  - https://doi.org/10.1038/s41567-026-03298-0
AB  - A strange metal is an exotic state of correlated quantum matter, and intensive efforts are ongoing to understand its nature. Here we show that the quantum Fisher information-a concept from quantum metrology-may provide helpful insights. We use inelastic neutron scattering and quantum Monte Carlo simulations to study quantum critical fluctuations of the Kondo destruction type, which are considered to underlie strange metal behaviour in heavy-fermion compounds. We find that the associated quantum Fisher information increases strongly and without a characteristic scale as the strange metal forms with decreasing temperature. This provides evidence for a quantum state with high multipartite entanglement and offers a positive descriptor of strange metallicity that points towards its microscopic basis. Our work opens a direction for future studies across a range of strange metal platforms.
SN  - 1745-2473
SN  - 1745-2481
ER  -