Bodyfelt JDZheng MCKottos TKuhl UStöckmann H-J26/06/200926/06/2009PHYSICAL REVIEW LETTERS, 2009, 102 (25)0031-9007https://hdl.handle.net/10179/7479We measure Anderson localization in quasi-one-dimensional waveguides in the presence of absorption by analyzing the echo dynamics due to small perturbations. We specifically show that the inverse participation number of localized modes dictates the decay of the Loschmidt echo, differing from the Gaussian decay expected for diffusive or chaotic systems. Our theory, based on a random matrix modeling, agrees perfectly with scattering echo measurements on a quasi-one-dimensional microwave cavity filled with randomly distributed scatterers.Journal article10.1103/PhysRevLett.102.2539011978251079-7114Massey_Dark01 Mathematical Sciences02 Physical Sciences09 Engineering