Fig. 2: Experimental observation of a quantum walk in a synthetic two-dimensional triangular chiral-tube lattice.
From: Multidimensional synthetic chiral-tube lattices via nonlinear frequency conversion
a A lattice with three coupling orders 1, 3 and 4, where only couplings to the shown sites are plotted with arrows. b The corresponding synthetic triangular lattice in two-dimensional space. c 3D sketch of the lattice in b. d Experimental realization of a frequency quantum walk, where P is the power of the three-pump spectral components with A1 = A2 = A5. e–g Mapping of experimental data from d to a two-dimensional triangular lattice with P = 0.10, 0.19, 0.28 mW, as indicated by the labels
