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Observing Floquet topological order by symmetry resolution

Daniel Azses1, Emanuele G. Dalla Torre2,3, and Eran Sela1

  • 1School of Physics and Astronomy, Tel Aviv University, Tel Aviv 6997801, Israel
  • 2Department of Physics, Bar-Ilan University, Ramat Gan 5290002, Israel
  • 3Center for Quantum Entanglement Science and Technology, Bar-Ilan University, Ramat Gan 5290002, Israel

Phys. Rev. B 104, L220301 – Published 2 December, 2021

DOI: https://doi.org/10.1103/PhysRevB.104.L220301

Abstract

Symmetry-protected topological order in one dimension leads to protected degeneracies between symmetry blocks of the reduced density matrix. In the presence of periodic driving, topological Floquet phases can be identified in terms of a cycling of these symmetry blocks between different charge quantum numbers. We discuss an example of this phenomenon with an Ising Z2 symmetry, using both analytic methods and real quantum computers. By adiabatically moving along the phase diagram, we demonstrate that the cycling periodicity is broken in Floquet topological phase transitions. An equivalent signature of the topological Floquet phase is identified as a computational power allowing for the teleportation of quantum information.

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