Optimal transport of cold atoms by modulating the velocity of traps

doi:10.1088/1674-1056/22/2/023702

Abstract This work experimentally demonstrates a new method of optimizing the transport of cold atoms via modulating the velocity profile imposed on a magnetic quadrupole trap. The trap velocity and corresponding modulation are controlled by varying the currents of two pairs of anti-Helmholtz coils. Cold ⁸⁷Rb atoms are transported in a non-adiabatic regime over 22 mm in 200 ms. For the transported atoms their final-vibration amplitude dependences of modulation period number, depth, and initial phase are investigated. With modulation period n=5, modulation depth K=0.55, and initial phase φ=0, cold atom clouds with more atom numbers, smaller final-vibration amplitude, and lower temperature are efficiently transported. Theoretical analysis and numerical simulation are also provided, which are in good agreement with experimental results.

Keywords: transport of cold atoms modulation velocity profile

Received: 15 June 2012
Revised: 30 July 2012
Accepted manuscript online:

PACS:	37.10.Vz	(Mechanical effects of light on atoms, molecules, and ions)
	37.10.Gh	(Atom traps and guides)
	37.90.+j	(Other topics in mechanical control of atoms, molecules, and ions)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10974210) and the National Basic Research Program of China (Grant No. 2011CB921504).

Corresponding Authors: Zhang Hai-Chao, Wang Yu-Zhu
E-mail: zhanghc@siom.ac.cn; yzwang@mail.shcnc.ac.cn

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Han Jing-Shan (韩景珊), Xu Xin-Ping (许忻平), Zhang Hai-Chao (张海潮), Wang Yu-Zhu (王育竹) Optimal transport of cold atoms by modulating the velocity of traps 2013 Chin. Phys. B 22 023702

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Optimal transport of cold atoms by modulating the velocity of traps

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