Symmetry resolved out-of-time-order correlators of Heisenberg spin chains using projected matrix product operators

IF 5.1 2区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Quantum Pub Date : 2025-10-01 DOI:10.22331/q-2025-10-01-1871
Martina Gisti, David J. Luitz, Maxime Debertolis
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Abstract

We extend the concept of operator charge in the context of an abelian $U(1)$ symmetry and apply this framework to symmetry-preserving matrix product operators (MPOs), enabling the description of operators projected onto specific sectors of the corresponding symmetry. Leveraging this representation, we study the effect of interactions on the scrambling of information in an integrable Heisenberg spin chain, by controlling the number of particles. Our focus lies on out-of-time order correlators (OTOCs) which we project on sectors with a fixed number of particles. This allows us to link the non-interacting system to the fully-interacting one by allowing more and more particle to interact with each other, keeping the interaction parameter fixed. While at short times, the OTOCs are almost not affected by interactions, the spreading of the information front becomes gradually faster and the OTOC saturate at larger values as the number of particle increases. We also study the behavior of finite-size systems by considering the OTOCs at times beyond the point where the front hits the boundary of the system. We find that in every sector with more than one particle, the OTOCs behave as if the local operator was rotated by a random unitary matrix, indicating that the presence of boundaries contributes to the maximal scrambling of local operators.
利用投影矩阵乘积算子对称解析海森堡自旋链的非时序相关器
我们将算子电荷的概念推广到一个阿贝尔$U(1)$对称中,并将这个框架应用到保持对称的矩阵积算子(MPOs)中,使得算子投影到相应对称的特定扇形上的描述成为可能。利用这一表述,我们通过控制粒子数,研究了相互作用对可积海森堡自旋链中信息乱序的影响。我们的重点在于超时序相关器(OTOCs),我们将其投射到具有固定数量粒子的扇区上。这使我们能够通过允许越来越多的粒子相互作用,保持相互作用参数固定,将非相互作用系统连接到完全相互作用的系统。在短时间内,OTOC几乎不受相互作用的影响,但随着粒子数量的增加,信息锋的扩散速度逐渐加快,OTOC在较大值时趋于饱和。我们还研究了有限尺寸系统的行为,考虑了锋面触及系统边界时的otoc。我们发现,在每个有多个粒子的扇形中,otoc的行为就像局部算子被一个随机的酉矩阵旋转一样,表明边界的存在有助于局部算子的最大置乱。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Quantum
Quantum Physics and Astronomy-Physics and Astronomy (miscellaneous)
CiteScore
9.20
自引率
10.90%
发文量
241
审稿时长
16 weeks
期刊介绍: Quantum is an open-access peer-reviewed journal for quantum science and related fields. Quantum is non-profit and community-run: an effort by researchers and for researchers to make science more open and publishing more transparent and efficient.
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