近日，河南师范大学的夏世强及其研究小组与兰州大学的安钧鸿等人合作并取得一项新进展。经过不懈努力，他们实现由表面等离激元极化子波导形成的非马尔可夫量子互连。相关研究成果已于2024年3月18日在国际知名学术期刊《物理评论A》上发表。

该研究团队提出了一种由金属纳米线的SPP形成的非马尔可夫QI方案。研究人员发现了一种使产生的量子发射器纠缠持久的机制。他们发现，只要在总QE-SPP体系能谱中形成束缚态，即使存在金属对SPP的吸收，也能克服SPP介导的纠缠阻尼。这一发现丰富了人们对吸收介质中光-物质耦合的理解，并为利用SPP设计量子互连系统铺平了道路。

据悉，量子互连(QI)允许在远距离量子发射器(QEs)之间通过飞行的光子产生有效的相互作用，本质上是一个光-物质界面，并作为量子技术的基石。金属波导支撑的表面等离激元(SPP)为探索强光-物质耦合和实现QI提供了理想的界面。然而，金属中SPP的损失使量子发射器的介导纠缠随着距离和时间的增加而衰减，阻碍了量子发射器的应用。

附：英文原文

Title: Non-Markovian quantum interconnect formed by a surface plasmon polariton waveguide

Author: Chun-Jie Yang, Xin-Yue Liu, Shi-Qiang Xia, Si-Yuan Bai, Jun-Hong An

Issue&Volume: 2024/03/18

Abstract: Allowing the generation of effective interactions between distant quantum emitters (QEs) via flying photons, quantum interconnect (QI) is essentially a light-matter interface and acts as a building block in quantum technologies. A surface plasmon polariton (SPP) supported by a metallic waveguide provides an ideal interface to explore strong light-matter couplings and to realize QI. However, the loss of SPP in metal makes the mediated entanglement of the QEs damp with the increase of the distance and time, which hinders its applications. We propose a scheme of non-Markovian QI formed by the SPP of a metallic nanowire. A mechanism to make the generated entanglement of the QEs persistent is discovered. We find that, as long as bound states are formed in the energy spectrum of total QE-SPP system, the damping of the SPP-mediated entanglement is overcome even in the presence of the metal absorption to the SPP. Our finding enriches our understanding of light-matter couplings in absorptive medium and paves the way for using the SPP in designing QI.

DOI: 10.1103/PhysRevA.109.033518

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.109.033518