物理学报2026，Vol.75Issue(11)：82-88,7.DOI:10.7498/aps.75.20260099
利用多频推送光提升双磁光阱装置中的冷原子输运效率
Enhanced cold atom transfer in a double magneto-optical trap using a multi-frequency pushing laser
摘要
Abstract
The dual magneto-optical trap scheme,which combines a two-dimensional magneto-optical trap(2D MOT)and a three-dimensional magneto-optical trap(3D MOT),has been widely used in quantum simulation,quantum computing,and quantum precision measurement.Enhancing the transfer efficiency of cold atoms in the dual MOT scheme remains one of the most critical challenges.The cold atom cloud in a 2D MOT adopts an elongated shape owing to the two-dimensional confinement.The Doppler broadening caused by the velocity distribution of cold atoms siginificantly exceeds the natural linewidth.Therefore,when a single-frequency laser is used,it can only push cold atoms within a specific velocity range,which limits the overall efficiency of cold atom transfer. We propose and experimentally demonstrate a cold atom transfer scheme that employs a multi-frequency pushing laser.The scheme utilizes an electro-optic modulator(EOM)to modulate a single-frequency pushing laser,and the generating multi-frequency pushing laser is capable of effectively transferring atoms with a broad velocity distribution.By employing this scheme,the effects of the pushing laser power,pushing laser detuning,and the RF power driving the EOM on the atom number and loading rate in a 3D MOT are systematically investigated.The experimental results demonstrate that employing a multi-frequency pushing laser can significantly increase the atom number in the 3D MOT.With the same pushing laser power,the atom number is increased by up to 40％.Multi-frequency pushing lasers primarily enhance atom loading by expanding the range of atomic velocity groups subjected to effective resonant interaction and increasing the proportion of atoms that can be captured by the 3D MOT,without significantly altering the optimal loading conditions of the 3D MOT. Our proposed scheme is easy to implement and requires minimal modifications to existing experimental systems.If combined with integrated optoelectronic technology to generate a customized multi-frequency pushing laser that matches the velocity distribution of cold atoms in a 2D MOT,this approach will further enhance the transfer efficiency of cold atoms in a dual MOT apparatus and substantially reduce the preparation time of cold atoms.The proposed multi-frequency pushing laser scheme not only facilitates more efficient preparation of cold atoms,but also contributes to the development of fields such as cold atom physics and quantum precision measurement.关键词
冷原子/磁光阱/原子输运/多频推送光/电光调制器Key words
cold atom/magneto-optical trap/atom transfer/multi-frequency pushing laser/electro-optic modulator引用本文复制引用
康鑫,吴嘉涛,史深圳,高璐娜,陈雨柯,韩成银,鹿博,李朝红..利用多频推送光提升双磁光阱装置中的冷原子输运效率[J].物理学报,2026,75(11):82-88,7.基金项目
国家重点研发计划(批准号:2022YFA1404104)、国家自然科学基金(批准号:92476201)和广东省量子科学战略专项(批准号:GDZX2304007,GDZX2305006,GDZX2204003)资助的课题. Project supported by the National Key Research and Development Program of China(Grant No.2022YFA1404104),the National Natural Science Foundation of China(Grant No.92476201),and the Guangdong Provincial Quantum Science Strategic Initiative,China(Grant Nos.GDZX2304007,GDZX2305006,GDZX2204003). （批准号:2022YFA1404104）
