Fig. 3: Complete state tomography.
From: Realizing a deterministic source of multipartite-entangled photonic qubits
a–c Three- and d–f four-mode state tomography. We plot the real part \({\rm{Re}}(\rho )\) of the most likely density matrices ρ (bars) for a, d the cluster state, b, e the GHZ state, and c, f the W state. Absolute values of the imaginary part (not shown) are all below 0.03. Ideal density matrices ρideal are shown as black wireframes. The fidelity \(F={\rm{Tr}}{\left(\sqrt{\sqrt{\rho }{\rho }_{{\rm{ideal}}}\sqrt{\rho }}\right)}^{2}\) is indicated. Entries are following the binary ordering from (0)000 to (1)111.
