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Many-body quantum coherence and interaction blockade in Josephson-linked Bose-Einstein condensates

beimu1009 添加于 2010-4-22 10:44 | 1618 次阅读 | 0 个评论

作者
Lee C, Fu L-B, Kivshar YS
摘要
We study many-body quantum coherence and interaction blockade in two Josephson-linked Bose-Einstein condensates. We introduce universal operators for characterizing many-body coherence without limitations on the system symmetry and total particle number N. We reproduce the results for both coherence fluctuations and number squeezing in symmetric systems of large N, and reveal several peculiar phenomena that may occur in asymmetric systems and systems of small N. For asymmetric systems, we show that, due to an interplay between asymmetry and inter-particle interaction, the coherence fluctuations are suppressed dramatically when |EC/EJ|Lt1, and both resonant tunneling and interaction blockade take place for large values of |EC/EJ|, where EC and EJ are the interaction and tunneling energies, respectively. We emphasize that the resonant tunneling and interaction blockade may allow creating single-atom devices with promising technology applications. We demonstrate that for the systems at finite temperatures the formation of self-trapped states causes an anomalous behavior.
详细资料
- 文献种类: Journal Article
- 期刊名称: EPL (Europhysics Letters)
- 期刊缩写: Europhys. Lett.
- 期卷页: 2008年第81卷第6期 60006页
- ISBN: 0295-5075
学科领域自然科学 » 物理学
标签

BEC quantum coherence
相关链接 DOI URL