Quantifying and Controlling Entanglement in the Quantum Magnet Cs2CoCl4

Pontus Laurell, Allen Scheie, Chiron J. Mukherjee, Michael M. Koza, Mechtild Enderle, Zbigniew Tylczynski, Satoshi Okamoto, Radu Coldea, D. Alan Tennant, and Gonzalo Alvarez
Phys. Rev. Lett. 127, 037201 – Published 13 July 2021; Erratum Phys. Rev. Lett. 130, 129902 (2023)
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Abstract

The lack of methods to experimentally detect and quantify entanglement in quantum matter impedes our ability to identify materials hosting highly entangled phases, such as quantum spin liquids. We thus investigate the feasibility of using inelastic neutron scattering (INS) to implement a model-independent measurement protocol for entanglement based on three entanglement witnesses: one-tangle, two-tangle, and quantum Fisher information (QFI). We perform high-resolution INS measurements on Cs2CoCl4, a close realization of the S=1/2 transverse-field XXZ spin chain, where we can control entanglement using the magnetic field, and compare with density-matrix renormalization group calculations for validation. The three witnesses allow us to infer entanglement properties and make deductions about the quantum state in the material. We find QFI to be a particularly robust experimental probe of entanglement, whereas the one and two-tangles require more careful analysis. Our results lay the foundation for a general entanglement detection protocol for quantum spin systems.

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  • Received 19 January 2021
  • Revised 18 May 2021
  • Accepted 25 May 2021

DOI:https://doi.org/10.1103/PhysRevLett.127.037201

© 2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsQuantum Information, Science & Technology

Erratum

Erratum: Quantifying and Controlling Entanglement in the Quantum Magnet Cs2CoCl4 [Phys. Rev. Lett. 127, 037201 (2021)]

Pontus Laurell, Allen Scheie, Chiron J. Mukherjee, Michael M. Koza, Mechtild Enderle, Zbigniew Tylczynski, Satoshi Okamoto, Radu Coldea, D. Alan Tennant, and Gonzalo Alvarez
Phys. Rev. Lett. 130, 129902 (2023)

Authors & Affiliations

Pontus Laurell1,2,*, Allen Scheie3, Chiron J. Mukherjee4,5, Michael M. Koza6, Mechtild Enderle6, Zbigniew Tylczynski7, Satoshi Okamoto8,9, Radu Coldea5, D. Alan Tennant8,9,10,†, and Gonzalo Alvarez1,2,‡

  • 1Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 2Computational Science and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 3Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 4Science Department, Drew School, San Francisco, California 94115, USA
  • 5Clarendon Laboratory, Oxford University, Parks Road, Oxford OX1 3PU, United Kingdom
  • 6Institut Laue-Langevin, 38042 Grenoble Cedex 9, France
  • 7Faculty of Physics, Adam Mickiewicz University, 61-614 Poznań, Poland
  • 8Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 9Quantum Science Center, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 10Shull-Wollan Center, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

  • *laurell@utexas.edu
  • tennantda@ornl.gov
  • alvarezcampg@ornl.gov

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Issue

Vol. 127, Iss. 3 — 16 July 2021

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