Figure 3. Experimental results for simulating CTQWs on K₄.

(a,b) The experimental sampled probability distributions with ideal theoretical distributions overlaid, for CTQWs on K₄ graph with initial states and . The s.d. of each individual probability is also plotted, which is calculated by propagating error assuming Poissonian statistics. (c,d) The ideal theoretical and experimentally reconstructed density matrices for the states (corresponding to ρ₁) and (corresponding to ρ₂). Both of the real and imaginary parts of the density matrices are obtained through the maximum likelihood estimation technique, and is shown as Re(ρ) and Im(ρ), respectively. Further results are shown in Supplementary Table 1, Supplementary Fig. 2 and Supplementary Note 4.