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arXiv 1908.11253cond-mat.stat-mechcond-mat.str-el
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测量诱导相变:用密度矩阵重整化群计算研究不可积模型

Measurement-induced phase transition: A case study in the non-integrable model by density-matrix renormalization group calculations

Qicheng Tang, W. Zhu

摘要:

研究了局域投影测量对量子猝灭动力学的影响。作为一个具体的例子,用矩阵乘积态和时变分块抽取方法模拟了一维玻色-哈伯德模型。我们绘制了一个在空间和时间域中的测量速率的全局相图,该相图显示了体积-面积定律的纠缠相变。当测量速率达到临界值时,我们观察到纠缠熵随子系统大小或演化时间的增加呈对数增长。此外,我们还发现单点纠缠熵的概率分布区分了体积和面积定律相,类似于无序诱导的多体局域化的情况。我们还研究了两个分离位点之间的纠缠熵和互信息的标度行为,这表明了一个单一的普适性类,从而提出了一个可能的统一描述这种转变。

英文摘要:

We study the effect of local projective measurements on the quantum quench dynamics. As a concrete example, a one-dimensional Bose-Hubbard model is simulated by the matrix product state and time-evolving block decimation. We map out a global phase diagram in terms of the measurement rate in spatial space and time domain, which demonstrates a volume-to-area law entanglement phase transition. When the measurement rate reaches the critical value, we observe a logarithmic growth of entanglement entropy as the subsystem size or evolved time increases. Moreover, we find that the probability distribution of the single-site entanglement entropy distinguishes the volume and area law phases, similar to the case of disorder-induced many-body localization. We also investigate the scaling behavior of entanglement entropy and mutual information between two separated sites, which is indicative of a single universality class and thus suggests a possible unified description of this transition.

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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