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arXiv 1101.0451quant-phcond-mat.quant-gas
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具有两种不同隧穿率的四阱Bose-哈伯德模型的量子动力学

Quantum dynamics of a four-well Bose-Hubbard model with two different tunneling rates

C. V. Chianca, M. K. Olsen

摘要:

我们考虑一个四模玻色-哈伯德模型的理论模型,该模型由两对通过两个不同速率的过程耦合的阱组成。该模型自然地分为两个子系统,具有强的系统内耦合和两个子系统之间的弱得多的耦合,并且先前已由Strzys和Anglin作为约瑟夫森热振荡的模型引入[ \pra { \bf 81},043616(2010)]。我们研究了这个模型的量子动力学的一系列不同的初始条件下,在数量分布的井和量子统计。我们发现,时间的演变是不同的平均场模型预测,该系统表现出广泛的有趣的行为。我们发现,该系统平衡到一个最大熵的状态,因此是一个有用的模型量子热化。由于我们的模型可以在实验室中实现一个很好的近似,它成为实验研究的候选人。

英文摘要:

We consider a theoretical model of a four-mode Bose-Hubbard model consisting of two pairs of wells coupled via two processes with two different rates. The model is naturally divided into two subsystems with strong intra-system coupling and much weaker coupling between the two subsystems and has previously been introduced as a model for Josephson heat oscillations by Strzys and Anglin [\pra {\bf 81}, 043616 (2010) ]. We examine the quantum dynamics of this model for a range of different initial conditions, in terms of both the number distribution among the wells and the quantum statistics. We find that the time evolution is different to that predicted by a mean-field model and that this system exhibits a wide range of interesting behaviours. We find that the system equilibriates to a maximum entropy state and is thus a useful model for quantum thermalisation. As our model may be realised to a good approximation in the laboratory, it becomes a candidate for experimental investigation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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