Steck Daniel A, Oskay Windell H, Raizen Mark G
Department of Physics and Center for Nonlinear Dynamics, The University of Texas at Austin, Austin, Texas 78712-1081, USA.
Phys Rev Lett. 2002 Mar 25;88(12):120406. doi: 10.1103/PhysRevLett.88.120406. Epub 2002 Mar 8.
We study quantum dynamical tunneling between two symmetry-related islands of stability in the phase space of a classically chaotic system. The setting for these experiments is the motion of carefully prepared samples of cesium atoms in an amplitude-modulated standing wave of light. We examine the dependence of the tunneling dynamics on the system parameters and indicate how the observed features provide evidence for chaos-assisted (three-state) tunneling. We also observe the influence of a noisy perturbation of the standing-wave intensity, which destroys the tunneling oscillations, and we show that the tunneling is more sensitive to the noise for a smaller value of the effective Planck constant.
我们研究了经典混沌系统相空间中两个与对称性相关的稳定岛之间的量子动力学隧穿。这些实验的设置是让精心制备的铯原子样本在振幅调制的驻波光中运动。我们研究了隧穿动力学对系统参数的依赖性，并指出观测到的特征如何为混沌辅助（三态）隧穿提供证据。我们还观察了驻波强度的噪声扰动的影响，这种扰动会破坏隧穿振荡，并且我们表明，对于较小的有效普朗克常量值，隧穿对噪声更敏感。
