磁光阱中单原子荧光信号的优化及单原子的高效装载

王杰英; 刘贝; 刁文婷; 靳刚; 何军; 王军民

doi:10.7498/aps.63.053202

摘要

实验中首先通过增大四极磁场梯度、提高背景真空度、缩小冷却俘获激光光束直径的方法获得了磁光阱中单原子的装载. 其次，通过减小冷却光失谐量、适当增加其光强、同时使用偏振光谱锁频技术抑制冷却光噪声的方法得到了磁光阱中高信号背景比的单原子荧光信号. 此外，通过实时反馈控制磁光阱四极磁场梯度的方法，在实验中实现了单原子98%的装载概率. 使用Hamburg Brown-Twiss 方案测量了磁光阱中的单原子在连续光激发下所辐射荧光的光子统计特性，得到二阶关联度g（2）（=0）=0.09.

关键词:

Abstract

In our experiment, firstly, we carry out the loading of single atoms in the magneto-optical trap (MOT) by increasing the quadrupole magnetic field gradient, improving the background vacuum, and reducing the diameters of the cooling and trapping laser beams. Secondly, we get the single atomic fluorescence signal of a high signal-to-background ratio in the MOT by means of reducing the detuning of cooling light and increasing its intensity appropriately, and using the polarization spectroscopy locking technique to suppress the fluctuations of cooling laser. In addition, with the real-time feedback on quadrupole magnetic field gradient, we demonstrate a probability of loading single atoms in the MOT as high as 98%. We also measure the statistical properties of the single atomic fluorescence which is excited by continuous light in the MOT; the measured second-order correlation is g(2)( = 0) = 0.09.

Keywords:

作者及机构信息

1.
量子光学与光量子器件国家重点实验室(山西大学), 山西大学光电研究所, 太原 030006

基金项目: 国家重大科学研究计划（批准号：2012CB921601）、国家自然科学基金（批准号：11274213，61205215，61227902）、国家自然科学基金创新群体项目（批准号：61121064）、山西省回国留学人员科研经费（批准号：2012-015）和山西省太原市科技明星专项（批准号：12024707）资助的课题.

Authors and contacts

1.
State Key Laboratory of Quantum Optics and Quantum Optics Devices (Shanxi University), and Institute of Opto-Electronics, Shanxi University, Taiyuan 030006

Funds: project supported by the National Basic Research Program of China (Grant No. 2012CB921601), the National Natural Science Foundation of China (Grant Nos. 11274213, 61205215, 61227902), the National Natural Science Foundation of Innovative Research Group Project (Grant No. 61121064), the Shanxi Scholarship Council of China (Grant No. 2012-015), and the Research Program for Sci Tech Star of Taiyuan, Shanxi Province, China (Grant No. 12024707).

参考文献

[1]	Hu Z, Kimble H J 1994 Opt. Lett. 19 1888
[2]	Ruschewitz F, Bettermann D, Peng J L, Ertmer W 1996 Europhys. Lett. 34 651
[3]	Haubrich D, Schadwinkel H, Strauch F, Ueberholz B, Wynands R, Meschede D 1996 Europhys. Lett. 34 663
[4]	Willems P A, Boyd R A, Bliss J L, Libbrecht K G 1997 Phys. Rev. Lett. 78 1660
[5]	Hilland S B, McClelland J J 2003 Appl. Phys. Lett. 82 3128
[6]	Yoon S, Choi Y, Park S, Kim J, Lee J H, An K 2006 Appl. Phys. Lett. 88 211104
[7]	Wang J, He J, Qiu Y, Yang B D, Zhao J Y, Zhang T C, Wang J M 2008 Chin. Phys. B 17 2062
[8]	He J, Yang B D, Zhang T C, Wang J M 2011 J. Phys. D: Appl. Phys. 44 135102
[9]	He J, Yang B D, Zhang T C, Wang J M 2011 Chin. Phys. B 20 073701
[10]	He J 2011 Ph. D. Thesis (Shanxi: Shanxi University) (in Chinese) [何军 2011 博士学位论文(山西:山西大学)]
[11]	Thompson J D, Tiecke T G, Zibrov A S, Vuletic V, Lukin M D 2013 Phys. Rev. Lett. 110 133001
[12]	Haubrich D, Hope A, Meschede D 1993 Opt. Commun. 102 225
[13]	Foot C J 2005 Atomic Physics (Oxford: Clarendon Press) 180-181
[14]	Carmichael H J, Walls D F 1976 J. Phys. B: At. Mol. Phys. 9 1199

施引文献

[1]	Hu Z, Kimble H J 1994 Opt. Lett. 19 1888
[2]	Ruschewitz F, Bettermann D, Peng J L, Ertmer W 1996 Europhys. Lett. 34 651
[3]	Haubrich D, Schadwinkel H, Strauch F, Ueberholz B, Wynands R, Meschede D 1996 Europhys. Lett. 34 663
[4]	Willems P A, Boyd R A, Bliss J L, Libbrecht K G 1997 Phys. Rev. Lett. 78 1660
[5]	Hilland S B, McClelland J J 2003 Appl. Phys. Lett. 82 3128
[6]	Yoon S, Choi Y, Park S, Kim J, Lee J H, An K 2006 Appl. Phys. Lett. 88 211104
[7]	Wang J, He J, Qiu Y, Yang B D, Zhao J Y, Zhang T C, Wang J M 2008 Chin. Phys. B 17 2062
[8]	He J, Yang B D, Zhang T C, Wang J M 2011 J. Phys. D: Appl. Phys. 44 135102
[9]	He J, Yang B D, Zhang T C, Wang J M 2011 Chin. Phys. B 20 073701
[10]	He J 2011 Ph. D. Thesis (Shanxi: Shanxi University) (in Chinese) [何军 2011 博士学位论文(山西:山西大学)]
[11]	Thompson J D, Tiecke T G, Zibrov A S, Vuletic V, Lukin M D 2013 Phys. Rev. Lett. 110 133001
[12]	Haubrich D, Hope A, Meschede D 1993 Opt. Commun. 102 225
[13]	Foot C J 2005 Atomic Physics (Oxford: Clarendon Press) 180-181
[14]	Carmichael H J, Walls D F 1976 J. Phys. B: At. Mol. Phys. 9 1199

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