Mechanism and Lineshapes of Sub-Fourier Resonances

Physics – Quantum Physics

Scientific paper

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5 pages, 3 figures, submitted to PRL

Scientific paper

Subtle internal interference effects allow quantum-chaotic systems to display "sub-Fourier" resonances, i.e. to distinguish two neighboring driving frequencies in a time shorter than the inverse of the difference of the two frequencies. We report experiments on the atomic version of the kicked rotor showing the unusual properties of the sub-Fourier resonances, and develop a theoretical approach (based on the Floquet theorem) explaining these properties, and correctly predicting the widths and lineshapes.

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