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Title: Cold-atom gravimetry with a Bose-Einstein condensate

Abstract

We present a cold-atom gravimeter operating with a sample of Bose-condensed {sup 87}Rb 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.

Authors:
; ; ; ; ; ; ;  [1];  [2]
  1. Australian Centre for Quantum Atom Optics and Department of Quantum Science, Australian National University, Canberra 0200 (Australia)
  2. School of Physics, Monash University, Melbourne 3800 (Australia)
Publication Date:
OSTI Identifier:
22068755
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 84; Journal Issue: 3; Other Information: (c) 2011 American Institute of Physics; Country of input: Syrian Arab Republic; Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 74 ATOMIC AND MOLECULAR PHYSICS; BEAM SPLITTING; BOSE-EINSTEIN CONDENSATION; GRAVIMETRY; INTERACTIONS; INTERFERENCE; INTERFEROMETERS; MEAN-FIELD THEORY; MOMENTUM TRANSFER; OSCILLATIONS; PHOTONS; POTENTIALS; RUBIDIUM 87; SENSITIVITY; SPACE-TIME; TRANSVERSE MOMENTUM; VISIBILITY

Citation Formats

Debs, J. E., Altin, P. A., Barter, T. H., Doering, D., Dennis, G. R., McDonald, G., Close, J. D., Robins, N. P., and Anderson, R. P. Cold-atom gravimetry with a Bose-Einstein condensate. United States: N. p., 2011. Web. doi:10.1103/PHYSREVA.84.033610.
Debs, J. E., Altin, P. A., Barter, T. H., Doering, D., Dennis, G. R., McDonald, G., Close, J. D., Robins, N. P., & Anderson, R. P. Cold-atom gravimetry with a Bose-Einstein condensate. United States. doi:10.1103/PHYSREVA.84.033610.
Debs, J. E., Altin, P. A., Barter, T. H., Doering, D., Dennis, G. R., McDonald, G., Close, J. D., Robins, N. P., and Anderson, R. P. Thu . "Cold-atom gravimetry with a Bose-Einstein condensate". United States. doi:10.1103/PHYSREVA.84.033610.
@article{osti_22068755,
title = {Cold-atom gravimetry with a Bose-Einstein condensate},
author = {Debs, J. E. and Altin, P. A. and Barter, T. H. and Doering, D. and Dennis, G. R. and McDonald, G. and Close, J. D. and Robins, N. P. and Anderson, R. P.},
abstractNote = {We present a cold-atom gravimeter operating with a sample of Bose-condensed {sup 87}Rb 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.},
doi = {10.1103/PHYSREVA.84.033610},
journal = {Physical Review. A},
issn = {1050-2947},
number = 3,
volume = 84,
place = {United States},
year = {2011},
month = {9}
}