Dicke-enhanced single-emitter strong coupling at ambient conditions as a quantum resource

环境条件下厚度增强的单发射极强耦合作为量子资源

• 批准号: 499351108
• 负责人: Professor Dr. Bert Hecht
• 金额: --
• 依托单位: Institut of Physics
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/499351108?language=en
• 关键词: Dicke; enhanced; single; emitter; strong

Strong coupling of light and matter at the single emitter level is a fundamental quantum resource since it offers (i) deterministic energy exchange between single photons and a two-level system, and (ii) the possibility to achieve single-photon nonlinearities via the anharmonicity of the Jaynes-Cummings ladder. We recently demonstrated strong coupling of a quantum dot and a broadband plasmonic nanoresonator at room temperature and ambient conditions and, to explain these results, postulated broadband multilevel coupling leading to a Dicke-type enhancement of the single-emitter coupling strength as well as enhanced coupling of the quantum emitter to the plasmonic nanoresonator. In the present project, both conjectures will be put under scrutiny and carried forward towards a quantum resource. To do so, we will develop a platform to integrate strongly coupled quantum emitter - plasmonic nanoresonator systems on a surface. Dielectrophoresis will be used to integrate quantum dots at desired positions, such as plasmonic hotspots, using electrically connected plasmonic nanostructures - a technological advance that was pioneered by one of us. An additional advantage of such nanostructures is the possibility to apply very large DC electric fields to quantum emitters which will be used to introduce tunability via the quantum confined Stark-effect. To experimentally achieve a Dicke-type enhancement of the coupling strength we will use PbS or PbSe quantum dots that offer up to 64 nearly degenerate levels close to the conduction band edge of a quantum dot. This should increase the coupling strength by nearly one order of magnitude thereby relaxing fabrication tolerances. Core-shell colloidal quantum dots will be prepared at the highest possible quality with controlled surface chemistry such that single-emitter experiments can be performed. On the theoretical side, we will develop a new approach to the quantum optics of light matter coupling at the nanoscale that takes into account the quasinormal mode structure of plasmonic nanoresonators and considers their role in broadband light matter interactions. Our results will lead to a methodology that will establish strong and possibly ultrastrong light-matter interaction at the single emitter basis as a novel quantum resource. Accessibility will be strongly enhanced by the largely reduced fabrication tolerances that should become affordable because of the increased coupling. The quantum multi-quasi-normal mode theory will provide a complete theoretical framework to accurately predict quantum light-matter dynamics at these extreme conditions and will aid the experimental implementation of devices for quantum information processing and quantum sensing. Specifically, as a final goal, we propose the implementation and characterization of a nanoscale single-photon transistor based on a scalable architecture.

光和物质在单发射能级上的强耦合是一种基本的量子资源，因为它提供了(i)单光子和双能级系统之间的确定性能量交换，以及（ii）通过詹尼斯-卡明斯阶梯的非调和性实现单光子非线性的可能性。我们最近展示了量子点和宽带等离子体纳米谐振器在室温和环境条件下的强耦合，为了解释这些结果，假设宽带多能级耦合导致单发射器耦合强度的dicke型增强，以及量子发射器与等离子体纳米谐振器的增强耦合。在目前的项目中，这两种猜想都将受到审查，并向量子资源的方向发展。为此，我们将开发一个平台，将强耦合量子发射器-等离子体纳米谐振器系统集成在表面上。用电连接等离子体纳米结构，双向电泳将被用于在理想位置（如等离子体热点）集成量子点——这是由我们之一开创的一项技术进步。这种纳米结构的另一个优点是可以将非常大的直流电场应用于量子发射器，这将通过量子受限的斯塔克效应引入可调性。为了在实验上实现dicke型的耦合强度增强，我们将使用PbS或PbSe量子点，它们在量子点的导带边缘附近提供高达64个近简并能级。这将使耦合强度增加近一个数量级，从而放宽制造公差。核壳胶体量子点将以尽可能高的质量制备，并控制表面化学，以便进行单发射器实验。在理论方面，我们将开发一种在纳米尺度上和光物质耦合的量子光学的新方法，该方法考虑了等离子体纳米谐振器的准正态模式结构，并考虑了它们在宽带光物质相互作用中的作用。我们的结果将导致一种方法学，该方法学将在单发射器基础上建立强的甚至可能是超强的光-物质相互作用，作为一种新的量子资源。由于增加了耦合，大大降低了制造公差，从而大大提高了可访问性。量子多准正模理论将为准确预测这些极端条件下的量子光物质动力学提供一个完整的理论框架，并将有助于量子信息处理和量子传感设备的实验实现。具体来说，作为最终目标，我们提出了基于可扩展架构的纳米级单光子晶体管的实现和表征。