Operator spreading in the memory matrix formalism

Operator spreading in the memory matrix formalism
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内存矩阵形式中的算子扩展

DOI:
10.1088/1751-8121/ac7091
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发表时间:
2022
期刊:
Mathematical and Theoretical
影响因子:
--
通讯作者:
McCulloch E
McCulloch E
中科院分区:
--
文献类型:
--
作者:
McCulloch E

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量子信息的传播和加扰是当前相当感兴趣的一个话题。大量研究表明,量子信息是根据流体动力学运动方程演化的,尽管它与更知名的流体动力学变量,如电荷和能量是截然不同的量。在这项工作中,我们证明了著名的传统流体力学的记忆矩阵形式可以应用于多体量子系统中的算符增长问题,只需做较小的修改。在概念层面上,这支持了信息混乱和流体动力学之间的联系。在实践层面上,它提供了一个框架,用于计算与算符增长有关的量,如蝴蝶速度和前沿扩散常数,以及理解这些量如何受到微观对称性的约束。我们应用这个形式微扰地计算了一族Floquet模型中的算符-流体动力学系数。我们的形式主义使我们能够确定影响信息传输的过程,这些过程产生于模型的时空对称性。
The spread and scrambling of quantum information is a topic of considerable current interest. Numerous studies suggest that quantum information evolves according to hydrodynamical equations of motion, even though it is a starkly different quantity to better-known hydrodynamical variables such as charge and energy. In this work we show that the well-known memory matrix formalism for traditional hydrodynamics can be applied, with relatively little modification, to the question of operator growth in many-body quantum systems. On a conceptual level, this shores up the connection between information scrambling and hydrodynamics. At a practical level, it provides a framework for calculating quantities related to operator growth like the butterfly velocity and front diffusion constant, and for understanding how these quantities are constrained by microscopic symmetries. We apply this formalism to calculate operator-hydrodynamical coefficients perturbatively in a family of Floquet models. Our formalism allows us to identify the processes affecting information transport that arise from the spatiotemporal symmetries of the model.
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期刊: PHYSICAL REVIEW X
影响因子: 12.5
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影响因子: --
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