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arXiv 2602.07952quant-phcond-mat.stat-mechhep-th
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布朗运动自旋SYK模型中高阶修正的 scrambling 动力学

Higher-Order Corrections to Scrambling Dynamics in Brownian Spin SYK Models

College of Physics Science and Technology, Hebei University(河北大学物理科学与技术学院);Hebei Key Laboratory of High-precision Computation and Application of Quantum Field Theory(河北省量子场论高精度计算与应用重点实验室);Hebei Research Center of the Basic Discipline for Computational Physics(河北省计算物理学基础学科研究中心);Kavli Institute for Theoretical Sciences (KITS), University of Chinese Academy of Sciences(中国科学院大学理论科学研究所(KITS))

Tingfei Li, Miao Wang, Jianghui Yu

AI总结:

本研究通过布朗运动自旋SYK模型,推导了算符大小分布的高阶修正,揭示了量子混沌的更精细探测机制。

摘要:

我们研究了一个具有随机全连接相互作用的布朗运动自旋Sachdev-Ye-Kitaev(SYK)模型中的算符增长,重点在于完整的算符大小分布。对于包含阶数为二至L的相互作用的哈密顿量,我们推导出一个闭合的主方程用于Pauli字符串展开系数,并将其动力学转换为适用于大N极限的生成函数形式。这种方法使我们能够显式对角化主导阶数的演算算子,并获得任意初始算符分布的精确解,包括退相干效应。超越主导阶数,我们开发了一种系统性的1/N展开,以捕捉算符大小动力学和晚期行为的高阶修正。我们的结果表明,高阶效应在算符混乱中起着关键作用,而完整的算符大小分布提供了更精细的量子混沌探测手段,适用于布朗运动和开放量子系统。

英文摘要:

We investigate operator growth in a Brownian spin Sachdev--Ye--Kitaev (SYK) model with random all-to-all interactions, focusing on the full operator-size distribution. For Hamiltonians containing interactions of order two up to $L$, we derive a closed master equation for the Pauli-string expansion coefficients and recast their dynamics into a generating-function formulation suitable for the large-$N$ limit. This approach allows us to diagonalize the leading-order evolution operator explicitly and obtain exact solutions for arbitrary initial operator distributions, including the effects of decoherence. Going beyond leading order, we develop a systematic $1/N$ expansion that captures higher-order corrections to the operator-size dynamics and the late-time behavior. Our results demonstrate that higher-order effects play a crucial role in operator scrambling and that the full operator-size distribution provides a more refined probe of quantum chaos in Brownian and open quantum systems.

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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