A new type of delocalization induced by coherent harmonic perturbations in one-dimensional Anderson-localized disordered systems is investigated. With only a few $M$ frequencies a normal diffusion is realized, but the transition to a localized state always occurs as the perturbation strength is weakened below a critical value. The nature of the transition qualitatively follows the Anderson transition (AT) if the number of degrees of freedom $M+1$ is regarded as the spatial dimension $d$. However, the critical dimension is found to be $d=M+1=3$ and is not $d=M+1=2$, which should naturally be expected by the one-parameter scaling hypothesis.

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• Diffusion
• Localization
• Quantum chaos
• Quantum phase transitions
• Quantum statistical mechanics
• Quantum stochastic processes
• Quantum transport
• Quantum-to-classical transition