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arXiv 1012.3813cond-mat.quant-gasquant-ph
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相互作用玻色-爱因斯坦凝聚体相干性的长寿命周期恢复

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

Mikhail Egorov, Russell P. Anderson, Valentin Ivannikov, Bogdan Opanchuk, Peter Drummond, Brenton V. Hall, Andrei I. Sidorov

摘要:

我们观察到相互作用的两组分玻色-爱因斯坦凝聚体(BEC)在Ramsey干涉仪中的相干性。平均场驱动的两个组件的集体振荡导致周期性的相移和相移的凝聚波函数与干涉条纹可见度的缓慢衰减。我们应用自旋回波同步的自重定相的凝聚体,以减少状态依赖的原子损失的影响,显着提高能见度高达0.75的演化时间为1.5秒。平均场论一致地预测比实验观察值更高的能见度。我们量化的经典和量子噪声的影响,并推断为2.8秒的相干时间为5.5e4相互作用的原子被困凝聚。

英文摘要:

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 1.5s. 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 5.5e4 interacting atoms.

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