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arXiv quant-ph/0412019quant-phnlin.CDphysics.atom-ph
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准周期受击转子中的量子扩散

Quantum diffusion in the quasiperiodic kicked rotor

Hans Lignier, Jean Claude Garreau, Pascal Szriftgiser, Dominique Delande

摘要:

我们研究了准周期受激转子中量子扩散的机制。我们报告的原子版本的系统的扩散常数的实验测量和发展的理论方法(基于Floquet定理)解释了观测结果,特别是在精确周期附近观测到的共振的"次傅立叶“特征,即系统在比两个频率差的倒数更短的时间内区分两个相邻驱动频率的能力。

英文摘要:

We study the mechanisms responsible for quantum diffusion in the quasiperiodic kicked rotor. We report experimental measurements of the diffusion constant on the atomic version of the system and develop a theoretical approach (based on the Floquet theorem) explaining the observations, especially the ``sub-Fourier'' character of the resonances observed in the vicinity of exact periodicity, i.e. the ability of the system to distinguish two neighboring driving frequencies in a time shorter than the inverse of the difference of the two frequencies.

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