Quantum fractal fluctuations - art. no. 014101

We numerically analyze quantum survival probability fluctuations in an open , classically chaotic system. In a quasiclassical regime and in the presenc e of classical mixed phase space, such fluctuations are believed to exhibit a fractal pattern, on the grounds of semiclassical arguments. In contrast, we work in a classical regime of complete chaoticity and in a deep quantum regime of strong localization. We provide evidence that fluctuations are s till fractal, due to the slow, purely quantum algebraic decay in time produ ced by dynamical localization. Such findings considerably enlarge the scope of the existing theory.