Fig. 2: Entanglement characterization.
From: Generation, characterization, and manipulation of quantum correlations in electron beams
a The bare pair amplitude \({{{\Phi }}}_{{s}_{1},{s}_{2}}^{\lambda }\left({k}_{1},{k}_{2}\right)\) is presented for selected control-parameter values, covering the key areas of the dynamical range. The amplitudes labeled Φi are calculated at the dimensionless interaction times \({T}_{\text{I}}=\left(1{0}^{-2},1{0}^{-3},1{0}^{-5},1{0}^{-5},1{0}^{-5}\right)\), with bandwidths \({\sigma }_{\text{e}}=\frac{2\pi }{{\lambda }_{\text{p}}}\left(2,2,2,1/2,1/20\right)\), respectively. b Collision entropy versus TI and σe, covering the entire dynamical range from correlated \(\left({{{\Phi }}}_{1}\right)\) to anticorrelated \(\left({{{\Phi }}}_{5}\right)\) momenta. c Variation of the Schmidt number κ along the dotted curve displayed in b, exposing the short time mode meshing of narrow-band electrons. d Schmidt spectrum of the amplitude displayed in e \(\left(\kappa \approx 6\right)\). The corresponding eigenstates are displayed in the inset with matching colors. e Pair amplitude in joint momentum space, where we display the first (lowest order) three modes.
