存储光学涡旋的拓扑稳定性
Topological stability of stored optical vortices
摘要：
我们报道了一个在Rb原子蒸气中储存光学涡旋的实验。由于它的2π相位扭曲，这种模式，也被称为拉盖尔-高斯模式，是拓扑稳定的，即使在强扩散的条件下也不能展开。为了补充我们的发现，我们存储了一个平坦的相位高斯光束与暗中心。与保持稳定超过100微秒的光学涡旋相反，检索的平相图像中的暗中心在存储时间小至10微秒时充满了光。该实验证明，更高的电磁模式可以转换为原子相干性，并且具有相位奇异性的模式对诸如扩散的退相干效应具有鲁棒性。这为在原子蒸气中存储二维信息提供了更精细的方案。
英文摘要：
We report an experiment in which an optical vortex is stored in a vapor of Rb atoms. Due to its 2πphase twist, this mode, also known as the Laguerre-Gauss mode, is topologically stable and cannot unwind even under conditions of strong diffusion. To supplement our finding, we stored a flat phase Gaussian beam with a dark center. Contrary to the optical vortex, which stays stable for over 100 microseconds, the dark center in the retrieved flat-phased image was filled with light at storage times as small as 10 microseconds. This experiment proves that higher electromagnetic modes can be converted into atomic coherences, and that modes with phase singularities are robust to decoherence effects such as diffusion. This opens the possibility to more elaborate schemes for two dimensional information storage in atomic vapors.
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