Simulating non-Hermitian quasicrystals with single-photon quantum walks
- URL: http://arxiv.org/abs/2112.15024v2
- Date: Tue, 31 May 2022 08:47:22 GMT
- Title: Simulating non-Hermitian quasicrystals with single-photon quantum walks
- Authors: Quan Lin, Tianyu Li, Lei Xiao, Kunkun Wang, Wei Yi, Peng Xue
- Abstract summary: We experimentally simulate non-Hermitian quasicrystals using photonic quantum walks.
Our work opens the avenue of investigating the interplay of non-Hermiticity, quasiperiodicity, and spectral topology in open quantum systems.
- Score: 8.119496606443793
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Non-Hermiticity significantly enriches the properties of topological models,
leading to exotic features such as the non-Hermitian skin effects and non-Bloch
bulk-boundary correspondence that have no counterparts in Hermitian settings.
Its impact is particularly illustrating in non-Hermitian quasicrystals where
the interplay between non-Hermiticity and quasiperiodicity results in the
concurrence of the delocalization-localization transition, the parity-time
(PT)-symmetry breaking, and the onset of the non-Hermitian skin effects. Here
we experimentally simulate non-Hermitian quasicrystals using photonic quantum
walks. Using dynamic observables, we demonstrate that the system can transit
from a delocalized, PT-symmetry broken phase that features non-Hermitian skin
effects, to a localized, PT-symmetry unbroken phase with no non-Hermitian skin
effects. The measured critical point is consistent with the theoretical
prediction through a spectral winding number, confirming the topological origin
of the phase transition. Our work opens the avenue of investigating the
interplay of non-Hermiticity, quasiperiodicity, and spectral topology in open
quantum systems.
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