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arXiv quant-ph/0008083quant-ph
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囚禁原子运动中的波包回波

Wave Packet Echoes in the Motion of Trapped Atoms

F. B. J. Buchkremer, R. Dumke, H. Levsen, G. Birkl, W. Ertmer

摘要:

我们从实验上证明并系统地研究了运动波包振荡的受激回复(回波)。为此,我们在一个光晶格中制备波包,通过非线性地移动电势,并在可变的时间延迟后通过第二次移动来刺激它们的再现。这种技术类似于自旋回波,即使在存在强退相的情况下也能够确定波包的相干时间。我们发现,对于强束缚原子,它是可比的冷却时间,远长于光子散射率的倒数。

英文摘要:

We experimentally demonstrate and systematically study the stimulated revival (echo) of motional wave packet oscillations. For this purpose, we prepare wave packets in an optical lattice by non-adiabatically shifting the potential and stimulate their reoccurence by a second shift after a variable time delay. This technique, analogous to spin echoes, enables one even in the presence of strong dephasing to determine the coherence time of the wave packets. We find that for strongly bound atoms it is comparable to the cooling time and much longer than the inverse of the photon scattering rate.

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