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  • Letter
  • Open Access

Generating symmetry-protected long-range entanglement

Shovan Dutta1,2,3, Stefan Kuhr4, and Nigel R. Cooper1,5

  • 1TCM Group, Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom
  • 2Max Planck Institute for the Physics of Complex Systems, 01187 Dresden, Germany
  • 3Raman Research Institute, CV Raman Avenue, Sadashivanagar, Bangalore 560080, India
  • 4Department of Physics, University of Strathclyde, Glasgow G4 0NG, United Kingdom
  • 5Department of Physics and Astronomy, University of Florence, Via G. Sansone 1, 50019 Sesto Fiorentino, Italy

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Phys. Rev. Research 6, L012039 – Published 23 February, 2024

DOI: https://doi.org/10.1103/PhysRevResearch.6.L012039

Abstract

Entanglement between spatially distant qubits is perhaps the most counterintuitive and vital resource for distributed quantum computing. However, despite a few special cases, there is no known general procedure to maximally entangle two distant parts of an interacting many-body system. Here we present a symmetry-based approach, whereby one applies several timed pulses to drive a system to a particular symmetry sector with maximal bipartite long-range entanglement. As a concrete example, we demonstrate how a simple sequence of on-site pulses on a qubit array can efficiently produce multiple stable nonlocal Bell pairs, realizable in present-day atomic and photonic experimental platforms. More generally, our approach paves a route for exotic state preparation by harnessing symmetry. For instance, we show how it allows the creation of long-sought-after superconducting η pairs in a repulsive Hubbard model.

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Phys. Rev. Research 6, L012039– Published 23 February, 2024
  • Received 7 February 2022
  • Accepted 15 December 2023
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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. Open access publication funded by the Max Planck Society.

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