arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2604.23005quant-phcond-mat.dis-nncond-mat.mtrl-sciphysics.chem-ph
收藏

增强量子输运的位点依赖噪声设计原则

Design Principles for Enhanced Quantum Transport with Site-Dependent Noise

University of Toronto（多伦多大学）；Vector Institute（向量研究所）；University of Toronto Mississauga（多伦多大学密西沙加分校）

Maggie Lawrence, Elise Wang, Dvira Segal

备注：
23 pages, 18 figures
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

AI总结：

研究通过优化位点依赖去相位实现增强量子输运，分析了不同输运机制下的稳态输运特性，发现位点优化去相位能提高输运效率并增强稳态空间局域化。

摘要：

环境噪声可以增强输运，这种效应被称为环境噪声辅助量子输运。大多数理论研究集中在优化系统参数以适应空间均匀的系统-环境耦合。本文则通过允许位点依赖的去相位来优化环境噪声本身。我们研究了一维晶格中具有梯度或无序能级景观的稳态输运，考虑了短程和长程相干隧道效应。在无环境效应的情况下，这些系统在热力学极限下可能表现出局域化，从而抑制输运，这是由于破坏性干涉所致。利用主方程框架，我们实现了局部去相位以最大化稳态人口流。我们发现，在梯度势中，短程隧道效应有利于交替位点的定向去相位，而长程隧道效应则受益于随距离增加而增加的去相位分布。在能量无序系统中，强偏移位点需要短程隧道效应下增强的局部去相位以促进输运。在所有情况下，我们发现位点优化的去相位比均匀去相位能提供更高的输运效率，并伴有稳态空间局域化的增强。我们的结果提供了关于相干动力学与环境噪声相互作用的微观见解。去相位局部拓宽能级，有助于克服偏移和破坏性干涉。更一般地，我们确立了空间结构化的环境噪声作为控制开放系统中量子输运和态相干性的策略。

英文摘要：

Environmental noise can enhance transport, an effect known as environmental noise-assisted quantum transport. Most theoretical studies focus on optimizing system parameters under spatially uniform system-environment coupling. Here, instead, we optimize the environmental noise itself by allowing for site-dependent dephasing. We investigate steady-state transport in one-dimensional lattices with either ramped or disordered energy landscapes, considering both short- and long-range coherent tunneling. In the absence of environmental effects, in the thermodynamic limit these systems can exhibit localization, and thus suppressed transport, arising from destructive interference. Using a Lindblad master equation framework, we implement local dephasing optimized to maximize steady-state population flux. We find that for ramp potentials, short-range tunneling favors selective dephasing on alternating sites, whereas long-range tunneling benefits from a dephasing profile that increases with distance from the injection site. In energetically disordered systems, strongly detuned sites require enhanced local dephasing under short-range tunneling to facilitate transport. In all cases, we find that site-optimized dephasing allows higher transport efficiency than uniform dephasing, and it is accompanied by increased spatial delocalization of the steady state. Our results provide microscopic insight into the interplay between coherent dynamics and environmental noise. Dephasing broadens energy levels locally, helping to overcome detuning and destructive interference. More generally, we establish spatially-structured environmental noise as a strategy for controlling both quantum transport and state coherence in open 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。

↑