Rydberg States in Localized Ensembles

这个项目的重点是操纵超冷里德堡原子在空间局部合奏。这种原子的独特性质使得封锁机制有可能扩展到整个样品，从而观察到有趣的量子效应。解决这个问题的方法允许高质量的量子操纵，同时考虑到原子复杂性引起的关键问题。特别是，要注意使样品具有适当的几何形状，具有足够大的Rydberg-Rydberg相互作用，以允许阻断机制起作用。为此，共振微波场在原子中诱导振荡偶极矩。通过观察在封锁条件下产生的相位匹配四波混频光的量子统计来识别封锁。在第二个实验中，集体拉比假摔的失相研究的制度，弱到差的封锁。据预测，退相将是突出的条件下，穷人的封锁，但将消失在强封锁level.This项目致力于显着的本科生参与，并有其本科生继续在AMO物理研究生院的历史。PI将研究项目中的概念整合到本科课程中，并从中招募本科研究人员。研究生的培训是该项目的一个特别重要的广泛成果。

This project is focusing on manipulating ultracold Rydberg atoms in spatially localized ensembles. The unique properties of such atoms make it possible for a blockade mechanism to extend over the entire sample, allowing for interesting quantum effects to be observed. The approach to this problem allows high quality quantum manipulations while accounting for key issues that arise from the complexity of the atoms. In particular, care is taken to make samples of appropriate geometry with sufficiently large Rydberg-Rydberg interactions to allow the blockade mechanism to work. To this end, resonant microwave fields induce oscillating dipole moments in the atoms. The blockades are identified by looking at the quantum statistics of phase-matched four-wave mixing light generated under blockade conditions. In a second experiment, the dephasing of collective Rabi flopping is studied in the regime of weak to poor blockade. It is predicted that dephasing will be prominent under conditions of poor blockade, but will disappear at strong blockade levels.This project is committed to significant undergraduate involvement and has a history of its undergraduate students continuing on to graduate school in AMO physics. The PI has integrated concepts from the research project into undergraduate courses from which he recruits undergraduate researchers. The training of graduate students is a particularly important broader outcome of this project.