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arXiv 1409.2689quant-phcond-mat.stat-mech
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动态量子态的定态系综近似:优化广义Gibbs包络

Stationary ensemble approximations of dynamic quantum states: Optimizing the Generalized Gibbs Ensemble

Dries Sels, Michiel Wouters

摘要:

我们重新考虑封闭量子系统的非平衡动力学。特别是我们专注于热化的可积系统。在这里,我们展示了如何广义吉布斯熵(GGE)可以被构造为最佳近似的时间依赖的密度矩阵。我们的程序允许一个系统的建设的GGE由一个约束最小化的距离,后者和真实的状态。此外,我们表明,GGE的熵是一个直接的措施的质量的近似。我们将我们的方法应用到淬冷硬核玻色气体。与标准GGE相比,我们的相关GGE恰当地描述了高阶关联函数。

英文摘要:

We reconsider the non-equilibrium dynamics of closed quantum systems. In particular we focus on the thermalization of integrable systems. Here we show how the generalized Gibbs Ensemble (GGE) can be constructed as the best approximation to the time dependent density matrix. Our procedure allows for a systematic construction of the GGE by a constrained minimization of the distance between the latter and the true state. Moreover, we show that the entropy of the GGE is a direct measure for the quality of the approximation. We apply our method to a quenched hard core bose gas. In contrast to the standard GGE, our correlated GGE properly describes the higher order correlation functions.

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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