Fig. 4
Scalable reconstruction algorithm for mixed states. a (Inset) Measured two-photon correlations for the mixed state \(\hat \rho _{{\mathrm{mix}}} = \left( {\hat \rho _{{\mathrm{anti - bunched}}} + \hat \rho _{{\mathrm{N00N}}}} \right){\mathrm{/}}2\). a Performance of the self guided tomography algorithm searching for the input density matrix that best matches the measured correlations. Red curves show 1000 different realizations of the algorithm. b The real (top row) and imaginary (bottom row) parts of the density matrix at iteration numbers 1, 30 and 300 during the realization highlighted with blue in Fig. 4a
