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^(87)Rb玻色-爱因斯坦凝聚体中双拉曼相对相位对相干跃迁操控的实验研究

Experimental study of coherent manipulation in ^(87)Rb Bose-Einstein condensate with phase difference of double stimulated Raman adiabatic passage
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摘要 发展了利用两对拉曼光之间的相对相位精确调控拉曼耦合强度的新方法,实现了两个量子态相干跃迁的操控.对两对拉曼光的光路进行了特殊设计,从而保证两对拉曼激光在传输过程中的相对相位保持恒定,然后作用到^(87)Rb原子的两个超精细塞曼能级|1,1〉和|1,0〉上,实验观测了两个量子态的布居数随两对拉曼光之间的相对相位的变化关系.该方法为超冷原子量子模拟实验提供了一个独特的操控参量--激光相位,由此拓展了受激拉曼跃迁的应用范围,为研究光与原子相互作用提供了一种新的方法. In this paper,we develop a new method to adjust the Raman coupling strength by using the relative phase between two pairs of Raman lasers.The stimulated Raman transition process is highly controllable and has the characteristics of multiple degrees of freedom.In experiments on ultracold atoms,the populations of atomic energy levels can be adjusted by taking an appropriate Raman light intensity and interaction time,and by detuning the two-photon frequency.The intensity of the Raman laser is usually changed to adjust the Raman coupling strength.Based on two-level atoms,a new method of accurately controlling the Raman coupling strength by using the relative phase between two pairs of Raman light beams is developed.This technology can achieve coherent manipulation of atomic quantum states,which greatly broadens the ability of ultracold atoms to perform quantum simulations.First,the 87Rb Bose-Einstein condensate is realized by using an optical dipole trap.Then,the two pairs of Raman lasers are designed with a special optical path to keep the relative phase of the two pairs of Raman lasers stable in the transmission process,and can be controlled accurately.Then the two pairs of Raman light beams act on the two ground state hyperfine energy levels |1,1> and |1,0>of the ^(87)Rb atom.In the experiment,we observe the relation between the percentage of atoms in the two quantum states and the relative phase between the two pairs of Raman light beams.This method provides a unique control parameter for ultracold atom quantum simulation experiments,which is the laser phase.It is hoped that this technology can be used to manipulate the interaction between light and atoms in the future to achieve more abundant physical phenomena.
作者 周方 文凯 王良伟 刘方德 韩伟 王鹏军 黄良辉 陈良超 孟增明 †张靖 Zhou Fang;Wen Kai;Wang Liang-Wei;Liu Fang-De;Han Wei;Wang Peng-Jun;Huang Liang-Hui;Chen Liang-Chao;Meng Zeng-Ming;hang Jing(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,Shanxi University,Taiyuan 030006,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China)
出处 《物理学报》 SCIE EI CAS CSCD 北大核心 2021年第15期114-120,共7页 Acta Physica Sinica
基金 国家重点研发计划(批准号:2016YFA0301602,2018YFA0307601) 国家自然科学基金(批准号:11804203,12004229)资助的课题
关键词 受激拉曼跃迁 激光相位 拉曼耦合强度 三能级原子系统 stimulated Raman transition laser phase Raman coupling strength three-level atomic system
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