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  • Letter
  • Open Access

Measuring postquench entanglement entropy through density correlations

Adrian Del Maestro1,2, Hatem Barghathi1, and Bernd Rosenow3

  • 1Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 2Min H. Kao Department of Electrical Engineering and Computer Science, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 3Institut für Theoretische Physik, Universität Leipzig, D-04103 Leipzig, Germany

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Phys. Rev. Research 4, L022023 – Published 26 April, 2022

DOI: https://doi.org/10.1103/PhysRevResearch.4.L022023

Abstract

Following a sudden change of interactions in an integrable system of one-dimensional fermions, we analyze the dependence of the static structure factor on the observation time after the quantum quench. At small waiting times after the quench, we map the system to noninteracting bosons such that we are able to extract their occupation numbers from the Fourier transform of the density-density correlation function, and use these to compute a bosonic entropy from a diagonal ensemble. By comparing this bosonic entropy with the asymptotic steady-state entanglement entropy per fermion computed with exact diagonalization, we find excellent agreement.

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Phys. Rev. Research 4, L022023– Published 26 April, 2022
  • Received 8 December 2021
  • Revised 17 March 2022
  • Accepted 22 March 2022
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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