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arXiv 1712.08020cond-mat.quant-gas
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双势阱中两种相互作用玻色子的剩余熵和临界行为

Residual entropy and critical behavior of two interacting boson species in a double well

Fabio Lingua, Andrea Richaud, Vittorio Penna

摘要:

基于纠缠和关联指标在量子系统分析中的重要性,我们研究了两种玻色-哈伯德二聚体在空间相分离时的平衡态和二分剩余熵.我们考虑零和非零温度制度。我们提出了不同种类的剩余熵(每一个与不同的方式划分系统),我们表明,它们严格依赖于特定的量子相表征的两个物种(超混合,混合或分层),即使在有限的温度。为了对零温度情形提供更深入的物理理解,我们应用基于su(2)相干态的全解析变分方法,并给出了一个相当好的纠缠熵近似.最后,我们证明了在非零温度下,当考虑能量本征态的限制性组合时,二分剩余熵作为关键指标的有效性是不变的。

英文摘要:

Motivated by the importance of entanglement and correlation indicators in the analysis of quantum systems, we study the equilibrium and the bipartite residual entropy in a two-species Bose Hubbard dimer when the spatial phase separation of the two species takes place. We consider both the zero and non-zero-temperature regime. We present different kinds of residual entropies (each one associated to a different way of partitioning the system), and we show that they strictly depend on the specific quantum phase characterizing the two species (supermixed, mixed or demixed) even at finite temperature. To provide a deeper physical insight into the zero-temperature scenario, we apply the fully-analytical variational approach based on su(2) coherent states and provide a considerably good approximation of the entanglement entropy. Finally, we show that the effectiveness of bipartite residual entropy as a critical indicator at non-zero temperature is unchanged when considering a restricted combination of energy eigenstates.

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