基于魔数波长光学偶极阱中单原子操控的触发式单光子源研究

基于单原子操控的单光子源，具有窄的带宽、可与同类原子系综吸收线匹配、基本不受环境因素的影响（与其他单光子源相比,单光子间的不可区分性相对易于实现）等特点，在量子光学基本问题研究及量子信息处理方面都具有重要价值。本项目拟在本研究组已掌握的基于中性原子激光冷却与俘获途径制备单原子的实验技术基础上，瞄准自由空间中基于单原子量子态的制备、操控和探测的触发式单光子源，针对可消除光学偶极阱中原子跃迁频率空间位置依赖的空间非均匀频移的魔数波长光学偶极阱，主要开展以下几方面的研究工作：.1)、原子内态AC Stark频移及魔数波长的计算及铯原子魔数波长微型光学偶极阱的实验构建及相关问题研究；.2)、魔数波长微型光学偶极阱中单原子的装载、进一步冷却、内态初始化制备、俘获寿命研究；.3)、单原子的光脉冲相干激发及相应的脉冲激光系统研究；.4)、基于单原子操控的触发式单光子源的实验实现及特性测量。

Single-atom-based single-photon source has several special chracteristics, such as narrow bandwidth, wavelength matching with tha absorption line of the same atomic emsamble, not sensitive to the environment disturbing (therefore it is much more suitable for achieving nondistinguishable single photons compared with other single-photon scheme), and it is very important not only for basic researches in quantum optics field but also for applications in quantum information processing. Based on the single-atom preparation which we already realized along the technical line of the laser cooling and trapping of neutral atoms, in this proposed project we will mainly focus on the triggered single-photon source with free-space single-atom preparation, trapping, manipulation and detection, especially pay more attentions to the magic-wavelength optical dipole trap with which the position-dependant spacially inhomogeneous AC Stark shift of the desired atomic transition can be eliminated.The following main aspects will be included in this proposed project: .1).Calculation of AC Stark shift of atomic internal state and possible magic wavelength of the desired atomic transition, and implementation of the magic-wavelength optical dipole trap for single cesium atom and relevant issues;.2).Investigation of loading, furthing cooling, internal-state initially preparing, trapping lifetime of single cesium atom in the magic-wavelength optical dipole trap;.3).Coherent excitation of single atom with pulsed lasers, and implementation of the proper short-pulse laser system; .4).Experimental demonstration and chracterization of the triggerd single- photon source based on single-atom manipulation.