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arXiv 2307.01802quant-ph
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基于无限张量网络收缩的开放量子系统动力学

Open Quantum System Dynamics from Infinite Tensor Network Contraction

Valentin Link, Hong-Hao Tu, Walter T. Strunz

AI总结:

本研究针对强耦合浴下非马尔可夫开放量子系统长时间动力学难题,提出用无限MPO演化方法将高斯环境的过程张量高效收缩为MPO形式,可自动生成辅助自由度、显著提速计算,还能借助传播子半群形式研究稳态物理。

摘要:

当浴(bath)处于强耦合状态时,探究非马尔可夫开放量子系统的长时间动力学是一项具有挑战性的任务。近期的研究方案通过用张量网络表示所谓的过程张量(process tensor)来解决这一问题。我们证明,对于高斯环境,利用无限矩阵乘积算符(MPO)演化方法可以高效地将其收缩为矩阵乘积算符(MPO)形式,相比现有方案能显著提升计算速度。该结果在结构上类似于经过精心设计辅助自由度的开放系统演化,如层级方法或赝模方法中的情况,但此处的这些自由度是由MPO演化算法自动生成的。此外,所得传播子的半群形式使我们能够研究稳态物理现象,例如相变。

英文摘要:

Approaching the long-time dynamics of non-Markovian open quantum systems presents a challenging task if the bath is strongly coupled. Recent proposals address this problem through a representation of the so-called process tensor in terms of a tensor network. We show that for Gaussian environments highly efficient contraction to matrix product operator (MPO) form can be achieved with infinite MPO evolution methods, leading to significant computational speed-up over existing proposals. The result structurally resembles open system evolution with carefully designed auxiliary degrees of freedom, as in hierarchical or pseudomode methods. Here, however, these degrees of freedom are generated automatically by the MPO evolution algorithm. Moreover, the semi-group form of the resulting propagator enables us to explore steady-state physics, such as phase transitions.

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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