arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.12274hep-thcond-mat.stat-mechcond-mat.str-elgr-qcquant-ph
收藏

SYK模型和JT引力中算子的复杂性增长

Complexity growth of operators in the SYK model and in JT gravity

Shao-Kai Jian, Brian Swingle, Zhuo-Yu Xian

摘要:

算符大小和计算复杂性的概念在量子混沌和全息对偶的研究中起着重要的作用,因为它们有助于描述随时间演化的海森堡算符的结构。特别重要的是要理解这些微观定义的复杂性度量如何与根据对偶全息几何定义的复杂性概念(如复杂性-体积(CV)对偶性)相关。本文研究了Sachdev-Ye-Kitaev(SYK)模型中的部分纠缠热态及其在Jackiw-Teitelboim(JT)引力下用插入黑洞内部的算符的对偶描述.我们将SYK模型中复杂性的微观定义(称为K-复杂性)与JT引力中使用CV对偶的计算进行比较,发现这两个量都表现出指数到线性的增长行为。我们还计算了运营商规模的增长下的时间演化,并找到大小和复杂性之间的连接。虽然算子大小的概念在加扰时间饱和,但我们的研究表明,在量子系统和引力理论中定义良好的复杂性可以作为算子演化在早期和晚期的有用度量。

英文摘要:

The concepts of operator size and computational complexity play important roles in the study of quantum chaos and holographic duality because they help characterize the structure of time-evolving Heisenberg operators. It is particularly important to understand how these microscopically defined measures of complexity are related to notions of complexity defined in terms of a dual holographic geometry, such as complexity-volume (CV) duality. Here we study partially entangled thermal states in the Sachdev-Ye-Kitaev (SYK) model and their dual description in terms of operators inserted in the interior of a black hole in Jackiw-Teitelboim (JT) gravity. We compare a microscopic definition of complexity in the SYK model known as K-complexity to calculations using CV duality in JT gravity and find that both quantities show an exponential-to-linear growth behavior. We also calculate the growth of operator size under time evolution and find connections between size and complexity. While the notion of operator size saturates at the scrambling time, our study suggests that complexity, which is well defined in both quantum systems and gravity theories, can serve as a useful measure of operator evolution at both early and late times.

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。

↑