Fig. 4: Localizable entanglement.
From: Realizing a deterministic source of multipartite-entangled photonic qubits
Negativity \({\mathcal{N}}\) between the first and (D + 1)-th photonic mode separated by a distance D. Filled dots indicate measurements based on complete tomography, dashed lines are inferred from process maps, empty dots are calculated from partial tomography (see text), and solid lines indicate the coherence limit from master equation simulations. Ideal value of \({\mathcal{N}}\) is 0.5. The cluster state (a, red diamond), GHZ state (b, blue circles), and W state (c, black squares) data are shown. Error bars represent the statistical SD of 0.025 estimated via repeated nominally identical measurements.
