Quantum fluids of light in 2D artificial reconfigurable aperiodic crystals with tailored coupling

Aperiodic crystals are the intermediates between strictly periodic crystalline matter and amorphous solids. The lack of translational symmetry combined with intrinsic long-range order endows aperiodic crystals with unique physical characteristics, while, at the same time, markedly enriching the spectrum and localization properties. Here, we demonstrate exciton-polariton condensation in a two-dimensional Penrose tiling with <i>C</i>₁₀ rotational symmetry-the evidence of quasicrystalline order in a quantum fluid of light. We identify a regime, wherein near-perfect delocalization and synchronization of a quantum fluid of light occurs at mesoscopic length scales extending beyond 100× the healing length and the size of each individual condensate. Realizing long-range order in fully reconfigurable quasicrystals of nonlinear and open-dissipative quantum fluids in the presence of artificial defects provides insights into phase synchronization between the condensates in unconventional, aperiodic settings.