近日，阿联酋技术创新研究所的Luigi Amico及其研究团队取得一项新进展。经过不懈努力，他们通过环形网络实现相干激励输运。相关研究成果已于2024年6月25日在国际知名学术期刊《物理评论A》上发表。

该研究团队专注于没有物质波传播的环形网络中，从激发源到漏的输运过程。他们基于与量子技术密切相关的、具有特定长程相互作用的自旋系统对电路进行建模，例如光镊或离子阱中捕获的里德伯原子。受rf-SQUIDs（射频超导量子干涉器件）和dc-SQUIDs（直流超导量子干涉器件）逻辑的启发，研究团队探讨了具有一个或两个局部能量偏移（或失谐）的环形结构。

通过调整这些局部失谐、特定的相移以及相干隧穿效应的组合，研究人员展示了如何精确控制激励的输运过程。这一控制方法独特地依赖于相互作用的范围。

据悉，物质波通过连接到引线的环形电路的相干量子输运定义了介观物理学中的一个标志性系统，它使人们既可以探索量子科学的基本问题，又可以为构思实际使用的设备绘制重要途径。

附：英文原文

Title: Coherent excitation transport through ring-shaped networks

Author: Francesco Perciavalle, Oliver Morsch, Davide Rossini, Luigi Amico

Issue&Volume: 2024/06/25

Abstract: The coherent quantum transport of matter wave through a ring-shaped circuit attached to leads defines an iconic system in mesoscopic physics that has allowed researchers to both explore fundamental questions in quantum science and to draw important avenues for conceiving devices of practical use. Here we study the source-to-drain transport of excitations going through a ring network, without propagation of matter waves. We model the circuit in terms of a spin system with specific long-range interactions that are relevant for quantum technology, such as Rydberg atoms trapped in optical tweezers or ion traps. Inspired by the logic of rf- and dc-SQUIDs, we consider rings with one and two local energy offsets, or detunings. As a combination of specific phase shifts in going through the localized detunings and as a result of coherent tunneling, we demonstrate how the transport of excitations can be controlled, with a distinctive dependence on the range of interactions.

DOI: 10.1103/PhysRevA.109.062619

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.109.062619