Figure 5: Geometries with efficient quantum transport for different numbers of sites.
From: Structure–dynamics relationship in coherent transport through disordered systems

The most efficient structures in the case N=4 (ε=0.922), N=6 (ε=0.998) and N=8 (ε=0.993). The three cases are shown in light blue, grey and light green, respectively. The grey area highlights the presence of pairs for N=6 and N=8.