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arXiv 1902.00977quant-phcond-mat.stat-mechcond-mat.str-elhep-th
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电荷守恒局域量子线路中Renyi纠缠熵的动力学

Dynamics of Renyi entanglement entropy in local quantum circuits with charge conservation

Yichen Huang

摘要:

在电荷守恒的局域量子线路中,我们将系统初始化为随机乘积态,研究了Renyi纠缠熵$R_α$的动力学性质.我们严格证明了$R_α$与Renyi指数$α>1$在时间$t$是$\le O(\sqrt{t\ln t})$,如果电荷的传输是扩散的。Rakovszky等人最近的数值结果表明,在电荷守恒的随机局域量子线路中,这个上限是饱和的(直到亚对数校正)。

英文摘要:

In local quantum circuits with charge conservation, we initialize the system in random product states and study the dynamics of the Renyi entanglement entropy $R_α$. We rigorously prove that $R_α$ with Renyi index $α>1$ at time $t$ is $\le O(\sqrt{t\ln t})$ if the transport of charges is diffusive. Very recent numerical results of Rakovszky et al. show that this upper bound is saturated (up to the sub-logarithmic correction) in random local quantum circuits with charge conservation.

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