Cold-atom gravimetry with a Bose-Einstein condensate

被引：113

作者：

Debs, J. E. ^{[1
,2
]}

Altin, P. A. ^{[1
,2
]}

Barter, T. H. ^{[1
,2
]}

Doering, D. ^{[1
,2
]}

Dennis, G. R. ^{[1
,2
]}

McDonald, G. ^{[1
,2
]}

Anderson, R. P. ^{[3
]}

Close, J. D. ^{[1
,2
]}

Robins, N. P. ^{[1
,2
]}

机构：

[1] Australian Natl Univ, Australian Ctr Quantum Atom Opt, Canberra, ACT 0200, Australia

[2] Australian Natl Univ, Dept Quantum Sci, Canberra, ACT 0200, Australia

[3] Monash Univ, Sch Phys, Melbourne, Vic 3800, Australia

来源：

PHYSICAL REVIEW A | 2011年 / 84卷 / 03期

关键词：

D O I：

10.1103/PhysRevA.84.033610

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We present a cold-atom gravimeter operating with a sample of Bose-condensed Rb-87 atoms. Using a Mach-Zehnder configuration with the two arms separated by a two-photon Bragg transition, we observe interference fringes with a visibility of (83 +/- 6)% at T = 3 ms. We exploit large momentum transfer (LMT) beam splitting to increase the enclosed space-time area of the interferometer using higher-order Bragg transitions and Bloch oscillations. We also compare fringes from condensed and thermal sources and observe a reduced visibility of (58 +/- 4)% for the thermal source. We suspect the loss in visibility is caused partly by wave-front aberrations, to which the thermal source is more susceptible due to its larger transverse momentum spread. Finally, we discuss briefly the potential advantages of using a coherent atomic source for LMT, and we present a simple mean-field model to demonstrate that with currently available experimental parameters, interaction-induced dephasing will not limit the sensitivity of inertial measurements using freely falling, coherent atomic sources.

引用

页数：5

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