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arXiv quant-ph/0212156quant-ph
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周期势中的随机共振:耗散光晶格中的实现

Stochastic resonance in periodic potentials: realization in a dissipative optical lattice

Michele Schiavoni, Francois-Regis Carminati, Laurent Sanchez-Palencia, Ferruccio Renzoni, Gilbert Grynberg

摘要:

我们观察到耗散光晶格布里渊传播模的随机共振现象。这种模式已被激发,通过施加一个移动的电位调制与相速度等于模式的速度。它的振幅已经被表征为原子云的质心(CM)速度。在布里渊共振条件下,我们研究了在一定深度的势阱中,CM速度与光抽运率的关系。我们已经观察到的CM速度的光抽运率,对应于噪声强度的共振依赖性。这对应于在低阻尼制度的周期性电位的随机共振的实验观察。

英文摘要:

We have observed the phenomenon of stochastic resonance on the Brillouin propagation modes of a dissipative optical lattice. Such a mode has been excited by applying a moving potential modulation with phase velocity equal to the velocity of the mode. Its amplitude has been characterized by the center-of-mass (CM) velocity of the atomic cloud. At Brillouin resonance, we studied the CM-velocity as a function of the optical pumping rate at a given depth of the potential wells. We have observed a resonant dependence of the CM velocity on the optical pumping rate, corresponding to the noise strength. This corresponds to the experimental observation of stochastic resonance in a periodic potential in the low-damping regime.

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