近日，沙特阿拉伯吉赞大学的Jabir Hakami与同济大学的许静平等人合作并取得一项新进展。经过不懈努力，他们实现了正交量子点激子态之间的纳米线介导光子纠缠。相关研究成果已于2024年11月13日在国际知名学术期刊《物理评论A》上发表。

该研究团队证实，在量子点-纳米线系统中，可以利用表面等离激元模式的激发，来构建由各向异性诱导的正交激子态之间的光子纠缠。当单个量子点被激发且靠近金属纳米线时，激子态发射的光子会直接与纳米线中亚波长尺度的光场束缚相耦合，从而产生长寿命的纠缠激子态。

在纳米线附近，态的谱密度得到极大增强，促进了强耦合状态和有效量子干涉的产生，使得激发能量可以在量子点的正交激子态与纳米线之间相干转移。衰减曲线中呈现非马尔可夫特性的拉比振荡，表明了靠近表面等离激元纳米线量子点中的激子态之间存在强相互作用。

附：英文原文

Title: Nanowire-mediated photon entanglement between orthogonal quantum-dot exciton states

Author: Jabir Hakami, Michael Vogl, Raghad AlAmri, Ali A. Kamli, Jingping Xu

Issue&Volume: 2024/11/13

Abstract: We demonstrate that in a quantum-dot-nanowire system, excitations of surface plasmon modes can be used to engineer anisotropy-induced photon entanglement between orthogonal exciton states. When a single quantum dot is excited in close proximity to a metallic nanowire, photon emission from the exciton states couples directly to the subwavelength confinement of optical fields in the nanowire, causing the long-lived entangled exciton states. The spectral density of states is immensely enhanced in the vicinity of the nanowire, mediating a strong coupling regime and effective quantum interference where the excitation energy can coherently be transferred between the orthogonal quantum-dot exciton states and the nanowire. The Rabi oscillation with non-Markovian features in the decay profiles signifies the strong interaction between the exciton states in the quantum dot near the surface plasmon nanowire.

DOI: 10.1103/PhysRevA.110.053709

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.110.053709