Quantum tunneling of ultracold atoms in optical traps

作     者：Jian-Hua Wu Ran Qi An-Chun Ji Wu-Ming Liu 

作者机构：Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China 

出 版 物：《Frontiers of physics》 (物理学前沿（英文版）)

年 卷 期：2014年第9卷第2期

页      面：137-152页

核心收录：

学科分类：070207[理学-光学] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：This work was supported by the Nat- ional Key Basic Research Special Foundation of China (Grant Nos. 2011CB921502  2012CB821305  2009CB930701  and 2010CB922904)  the National Natural Science Foundation of China (Grant Nos. 10934010  11228409  and 61227902)  and the National Natural Science Foundation of China-The Research Grants Council (Grant Nos. 11061160490 and 1386-N-HKU748/10) 

主　　题：quantum tunneling Josephson effect Landau-Zener tunneling atom-cavity 

摘      要：We review our theoretical advances in quantum tunneling of BoseEinstein condensates in optical traps and in microcavities. By employing a real physical system, the frequencies of the pseudo Goldstone modes in different phases between two optical traps are studied respectivdy, which are tile crucial feature of the non-Abelian Joseptmon effect. When the optical lattices are under gravity, we investigate the quantum tummling in the ＂Wannier-Stark localization＂ regime and ＂Lan（lau Zener tunneling＂ regime. We finally get the total decay rate and the rate is valid over the entire range of temperatures. At high temperatures, we show how the decay rate reduces to the appropriate results for the classical thermal activation. At hltermediate temperatures, the results of tile total decay rate are consistent with the thermally assisted tunneling. At low temperatures, we obtain the pure quantmn tunneling ultimately. And we study the alternating-current and direct-current （ac and de） photonic 3osephson effects in two weakly linked microcavities containing ultracold two-level atones, which allows for direct observation of the effects. This enables new investigations of the effect of maw-body physics in strongly coupled atom-cavity systems and provides a strategy for constructing novel interference devices of coherent photons. In addition, we propose the experimental protocols to observe these quantmn tunneling of Bose- Einstein condensates.