Fig. 6: Quantum circuit simulating \({e}^{it\theta {\sum }_{(i,j)\in E}{Z}_{(i)}{Z}_{(j)}}\).
From: Synthesizing efficient circuits for Hamiltonian simulation

When the underlying graph G = (V, E) is (a) 4-point circle, (b) 3-point line, (c) triangle, (d) 4-point complete graph, (e) 6-point circle.