1 山西大学激光光谱研究所量子光学与光量子器件国家重点实验室, 太原 030006
2 山西大学极端光学协同创新中心, 太原 030006
本文33Σ+1以为中间激发态, 通过扫描光缔合光的频率得到了33Σ+1的不同振动态光谱。研究发现利用短程光缔合制备的超冷基态85Rb133mCs分子产率在33Σ+1(v=3)处较其他振动态更大, 33Σ+1(v=3)转动常数较邻近的振动态有明显变化且与23Π0－(v=14)的能量接近, 这些特征显示了这两个振动态的共振耦合特性。优化光缔合光的功率和光电离光的能量后, 我们得到X1Σ+(v=0)最低振动态超冷85Rb133Cs分子的产率为1.5×104/s。在考虑了分子波函数的宇称和跃迁选择定则后, 我们发现33Σ+1(v=3,J=1)存在单步自发辐射制备超冷基态85Rb133Cs分子的通道, 采用该通道可实现原子-分子相干转移直接制备超冷基态分子。
共振耦合 单步自发辐射 光缔合 光电离 resonant coupling single pass spontaneously decay photoassociation photoionization
1 中北大学仪器与电子学院,太原０３００５１
2 中北大学仪器与电子学院,太原０３００５１)
室温条件下高浓度的NV－ 色心系综的相干时间受到较高浓度顺磁杂质和杂质自旋的影响,限制着其高灵敏磁传感的实现. 为了增加NV－ 色心系综的相干时间,本文对系综的动力学解耦(DD)过程进行研究. 在外部磁场为４０ G 的条件下,通过连续光学磁共振光谱技术(CWＧODMR),首先确定电子自旋态|ms＝０＞→|ms＝±１＞共振跃迁对应的微波频率;构建脉冲控制序列,观测不同微波功率条件下系综NV－色心自旋电子态|ms＝０＞→|ms＝ ＋１＞ 的相干Rabi振荡,获得最优功率的π脉冲作用时间;基于典型的CPMGＧn 控制序列,研究最优脉冲作用下不同π脉冲个数的DD过程. 在最大输入微波功率为１??３０mW 的条件下,获得的π 脉冲长度为２８??８ns;结合CPMGＧ３２控制脉冲序列,系综的典型相干时间由３７２(３)ns提升至８??７(１)μs. 该研究结果为后续高灵敏量子磁检测的实现奠定了实验基础.
金刚石NVＧ色心系综 Rabi振荡 动力学解耦 NV- color center ensemble in diamond Rabi oscillations dynamic decoupling
Author Affiliations
Abstract
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
We present a simple, robust, space-adjustable dark magneto-optical trap (MOT) for the efficient production of heteronuclear molecules. Double-mixed beams made up of repumping beams and depumping beams propagate in nearly opposite directions in the dark MOT. This optical arrangement can easily adjust the spatial positions of two clouds by changing the power ratio of the two repumping beams, and ensure a good overlap, which is very necessary for the production of heteronuclear molecules. The imaging of cold atoms by camera and the collision-induced loss rate obtained by recording the loading curve of the cold atoms show that we obtain a perfect overlap of atom clouds. The number of RbCs molecules with the double-mixed beams is improved by 70%, which is higher than the one with the single-mixed beam.
020.3320 Laser cooling 020.7010 Laser trapping 300.6360 Spectroscopy, laser 300.6390 Spectroscopy, molecular Chinese Optics Letters
2015, 13(11): 110201
