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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/202737
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- Long-lived periodic revivals of coherence in an interacting Bose-Einstein condensate
- Egorov, M.; Anderson, R. P.; Ivannikov, V.; Opanchuk, B.; Drummond, P. D.; Hall, B. V.; Sidorov, A. I.
- We observe the coherence of an interacting two-component Bose-Einstein condensate (BEC) surviving for seconds in a trapped Ramsey interferometer. Mean-field-driven collective oscillations of two components lead to periodic dephasing and rephasing of condensate wave functions with a slow decay of the interference fringe visibility. We apply spin echo synchronous with the self-rephasing of the condensate to reduce the influence of state-dependent atom losses, significantly enhancing the visibility up to 0.75 at the evolution time of 1.5 s. Mean-field theory consistently predicts higher visibility than experimentally observed values. We quantify the effects of classical and quantum noise and infer a coherence time of 2.8 s for a trapped condensate of 5.5×104 interacting atoms.
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Centre for Atom Optics and Ultrafast Spectroscopy
- Physical Review A, Vol. 84, no. 2 (Aug 2011), article no. 021605(R)
- Publication year
- FOR Code(s)
- 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics; 0205 Optical Physics; 0204 Condensed Matter Physics
- Atomic and molecular physics; Bose-Einstein condensate; Interacting atoms; Ramsey interferometer; Spin echo
- American Physical Society
- Publisher URL
- Copyright © 2011 American Physical Society. Published version of the paper reproduced here in accordance with the copyright policy of the publisher.
- Full text
- Peer reviewed