Long-lived periodic revivals of coherence in an interacting Bose-Einstein condensate

Mikhail Egorov, Russell Anderson, V Ivannikov, B Opanchuk, P Drummond, B Hall, Andrei Sidorov

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    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.
    Original languageEnglish
    Pages (from-to)1 - 4
    Number of pages4
    JournalPhysical Review A
    Issue number2
    Publication statusPublished - 2011

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