Fig. 2: Experimental results obtained with the KRAKEN protocol in the case of photoionization of helium atoms.
a, Photoelectron spectrograms are acquired for different values of δω (from left to right: ℏδω = 0, 41, 61, 80, 98, 117, 134 meV). b, Energy-resolved oscillation amplitude Aδω for the different spectrograms. The shaded area indicates the uncertainty of the fit (1 s.d.; Supplementary Discussion 2). c, The density matrix obtained by inserting the oscillation amplitudes for each δω at the corresponding position in an initially empty density matrix. The dark blue areas correspond to regions of the density matrix that are not reconstructed.
