arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0911.0772physics.atom-ph
收藏

超冷气体中回波序列后里德伯激发的关联

Correlations of Rydberg excitations in an ultra-cold gas after an echo sequence

S. Wuster, J. Stanojevic, C. Ates, T. Pohl, P. Deuar, J. F. Corney, J. M. Rost

备注：
8 pages, 6 figures
发表信息：
Phys. Rev. A 81, 023406 (2010)
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

我们发现，在超冷气体中的里德堡态可以激发与强烈优选的最近邻距离，如果密度远低于饱和。该方案利用回波序列，其中激光脉冲的前半部分激发里德伯态，而后半部分使原子返回到基态，如Raitzsch等人的实验[Phys.Rev.Lett. 100（2008）013002]。在接近回波序列的末端时，几乎所有剩余的里德伯原子都与它的下一个邻居里德伯原子分离，分离的距离略大于脉冲中途的瞬时阻塞半径。这些相关性导致原子计数统计从泊松分布的大偏差。我们的结果是基于精确的量子演化的样品与少量的原子。最后，我们证明了实用的欧米茄展开的相关动力学的近似描述通过回波序列。

英文摘要：

We show that Rydberg states in an ultra-cold gas can be excited with strongly preferred nearest-neighbor distance if densities are well below saturation. The scheme makes use of an echo sequence in which the first half of a laser pulse excites Rydberg states while the second half returns atoms to the ground state, as in the experiment of Raitzsch et al. [Phys. Rev. Lett. 100 (2008) 013002]. Near to the end of the echo sequence, almost any remaining Rydberg atom is separated from its next-neighbor Rydberg atom by a distance slightly larger than the instantaneous blockade radius half-way through the pulse. These correlations lead to large deviations of the atom counting statistics from a Poissonian distribution. Our results are based on the exact quantum evolution of samples with small numbers of atoms. We finally demonstrate the utility of the omega-expansion for the approximate description of correlation dynamics through an echo sequence.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

↑