近日，土耳其阿卡德尼兹大学的Ramazan Sahin及其研究团队取得一项新进展。经过不懈努力，他们实现了非相干量子系统中激子-等离激元态的斯塔克控制。相关研究成果已于2024年8月13日在国际知名学术期刊《物理评论A》上发表。

本文展示了通过光学斯塔克效应对（i）非共振和（ii）共振耦合量子系统中激子-等离激元杂化态的相干控制。研究人员分析了一个混合等离激元-发射体系统，该系统表现出可调谐的光致发光、斯塔克效应诱导的透明性和真空拉比分裂，这是由于量子发射体（QE）的简并态中存在二次斯塔克位移。

此外，一个共振耦合系统由于两级量子发射体中的斯塔克效应诱导分裂，显示出混合激子-等离激元杂化态的路径干涉。这项研究表明，斯塔克效应对激子-等离激元杂化态的调节不仅减轻了量子系统中的退相干，还激发了可见光区自发光子发射的开/关切换。这种可调谐的系统可用于操作光子集成电路，应用于量子计算和信息处理领域。

据悉，嵌入等离激元纳米腔的量子点的电光控制能够对光子器件进行主动调谐，以应用于量子光学的新兴领域，如量子信息处理、纠缠和超快光开关等。

附：英文原文

Title: Stark control of plexcitonic states in incoherent quantum systems

Author: Hira Asif, Ramazan Sahin

Issue&Volume: 2024/08/13

Abstract: Electro-optic control of quantum dots embedded in plasmonic nanocavities enables active tuning of photonic devices for emerging applications in quantum optics such as quantum information processing, entanglement, and ultrafast optical switching. Here, we demonstrate the coherent control of plexcitonic states in (i) off-resonant and (ii) resonant coupled quantum systems through the optical Stark effect. We analyze a hybrid plasmon-emitter system which exhibits tunable photoluminescence, Stark-induced transparency, and vacuum Rabi splitting due to a quadratic Stark shift in the degenerate states of a quantum emitter (QE). In addition, a resonantly coupled system shows path interference of hybrid plexcitonic states due to Stark-induced splitting in a two-level QE. Our study shows that the Stark tuning of plexcitons not only mitigates decoherence in the quantum system but it also stimulates the on/off switching of spontaneous photon emission in the visible regime. Such tunable systems can be used to operate photonic integrated circuits for applications in quantum computing and information processing.

DOI: 10.1103/PhysRevA.110.023713

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.110.023713