Buchkremer F B, Dumke R, Levsen H, Birkl G, Ertmer W
Institut für Quantenoptik, Universität Hannover, Welfengarten 1, D-30167 Hannover, Germany.
Phys Rev Lett. 2000 Oct 9;85(15):3121-4. doi: 10.1103/PhysRevLett.85.3121.
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 nonadiabatically shifting the potential and stimulate their reoccurrence 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.
我们通过实验证明并系统研究了运动波包振荡的受激复兴（回波）。为此，我们通过非绝热地移动势场在光学晶格中制备波包，并在可变时间延迟后通过第二次移动来刺激它们的再次出现。这种类似于自旋回波的技术，即使在存在强退相的情况下，也能让人们确定波包的相干时间。我们发现，对于强束缚原子，其相干时间与冷却时间相当，且比光子散射率的倒数长得多。
