Published July 7, 2023 | Version Version 1.0
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Data of the publication "Absence of Localization in Two-Dimensional Clifford Circuits"

  • 1. University of Bristol
  • 2. Leibniz Universität Hannover
  • 3. University College London


We analyze a Floquet circuit with random Clifford gates in one and two spatial dimensions. By using
random graphs and methods from percolation theory, we prove in the two-dimensional (2D) setting that
some local operators grow at a ballistic rate, which implies the absence of localization. In contrast, the
one-dimensional model displays a strong form of localization, characterized by the emergence of left- and
right-blocking walls in random locations. We provide additional insights by complementing our analytical results with numerical simulations of operator spreading and entanglement growth, which show the
absence (presence) of localization in two dimensions (one dimension). Furthermore, we unveil how the
spectral form factor of the Floquet unitary in 2D circuits behaves like that of quasifree fermions with
chaotic single-particle dynamics, with an exponential ramp that persists up to times scaling linearly with
the size of the system. Our work sheds light on the nature of disordered Floquet Clifford dynamics and
their relationship to fully chaotic quantum dynamics.


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Journal article: 10.1103/PRXQuantum.4.030302 (DOI)


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