Fig. 4: Quadratic dependence of superabsorption on atom number.
From: Realization of superabsorption by time reversal of superradiance
a, For a given number of atoms in the cavity, the maximum number of photons that can be completely absorbed is evaluated at t0. b, The reduced number of photons from t = 0 to t0 (280 ns) in a versus N. The upper grey-shaded area indicates the theoretically expected photon number reduction from the cavity decay, whereas the lower red-shaded area indicates the increase by the spontaneous emission. The absorption by the correlated dipoles then corresponds to the sum of the blue- and the red-shaded areas. c, The absorbed number of photons obtained in b versus N. The N-dependence is well fit by Nq (red curve) with q = 1.86 ± 0.03. The inset shows a linear fit in the log–log plot. The error bars indicate the standard deviations from repeated measurements.
