Suppression of dephasing due to a trapping potential and atom-atom interactions in a trapped-condensate interferometer.
Suppression of dephasing due to a trapping potential and atom-atom interactions in a trapped-condensate interferometer.
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DOI：
10.1103/physrevlett.99.180401
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发表时间：
2007-10
影响因子：
8.6
通讯作者：
M. Horikoshi;K. Nakagawa
中科院分区：
文献类型：
--
作者：
M. Horikoshi;K. Nakagawa
我们提出并演示了一种利用谐波磁势中的光学布拉格衍射的新型俘获凝聚干涉仪，它可以实现长相干时间和低相移。通过将询问时间设置为等于谐波电势的振荡周期，可以消除由磁势引起的波包相移。谐波势还有助于抑制由于凝聚态原子间相互作用而导致的相移。在 58 ms 的询问时间下观察到条纹对比度为 30% 的干涉信号。对于约 100 ms 的较长询问时间，尽管干涉条纹被外部振动噪声冲掉，但仍然保持了凝结物的空间相干性和低失相。
We propose and demonstrate a novel trapped-condensate interferometer using optical Bragg diffractions in a harmonic magnetic potential, which can realize a long coherence time with low dephasing. Dephasing of wave packets due to the magnetic potential is canceled by setting the interrogation time equal to the oscillation period of the harmonic potential. The harmonic potential also helps to suppress dephasing due to condensate atom-atom interactions. An interference signal with a fringe contrast of 30% is observed at an interrogation time of 58 ms. For a longer interrogation time about 100 ms, the spatial coherence of the condensate is still maintained with low dephasing, although the interference fringe is washed out by external vibrational noise.