Quantum dot micro-cavity solid-state quantum light sources

本项目主要研究用于量子通信和信息处理的固态微腔量子点系统的实现和应用。它的目标是开发所需的工具，以实现前所未有的高效量子光源。设想的平台由嵌入在工程微腔结构中的量子点组成。这种方法将允许量子光源的质量不容易实现在现有system.In，特别是我们的目标是设计，制造和表征在共振激发，两种类型的光子器件。第一个器件将由单个量子点组成，该量子点被确定性地嵌入到专门设计用于增强线性偏振单光子发射的柱微腔中。这种增强将通过实施非对称柱微腔来实现。微腔设计将以这种方式进行调整，以最大化发射光子的相干性以及收集效率。我们的第二个装置将解决宽带光子结构中的珀塞尔增强问题。强烈需要这样的实现来有效地收集由单个量子点发射的光子对。此外，适度的珀塞尔增强允许收集具有非常高的波包相干性的光子。这将通过实施具有锥形柱的微腔来实现。实施的器件将通过最先进的共振激光光谱学进行测试，包括双光子激发技术，以确定性地在发射器中创建双激子态。这种方法将允许实验，如非常有效地产生具有非常高的纠缠度和时间复用多光子纠缠态的时间仓纠缠光子。我们的实验将最终测试微腔收集增强方法的能力，使量子光源适用于未来的片上或片外量子网络和光子量子仿真器。

This project focuses on the realization and application of a solid-state microcavity quantum dot system for quantum communication and information processing. It has as a target the development of tools needed achieve unprecedentedly efficient sources of quantum states of light. The envisioned platform consists of quantum dots embedded in an engineered microcavity structures. This approach will allow for quantum light source qualities not easily achievable in the existing systems.In particular we aim at design, fabrication, and characterization in resonant excitation, of two types of photonic devices. The first device will consist of a single quantum dot that is deterministically embedded in a pillar microcavity specifically designed to enhance emission of linearly polarized single photons. This enhancement will be achieved by implementation of an asymmetric pillar microcavity. The microcavity design will be adapted in such a way, to maximize the coherence of the emitted photons as well as collection efficiency. Our second device will address the problem of Purcell enhancement in broadband photonic structures. Such an implementation is strongly required for efficient collection of pairs of photons emitted by a single quantum dot. In addition, a moderate Purcell enhancement allows for collection of photons with very high coherence of the wavepacket. This will be achieved by implementation of microcavities with a tapered pillar.The implemented devices will be tested by state-of-the-art resonant laser spectroscopy including two-photon excitation techniques to deterministically create biexcitonic states in the emitter. This approach will allow for experiments such as very efficient generation of time-bin entangled photons with very high degree of entanglement and time multiplexed multi-photon entangled states. Our experiments will ultimately test the capability of the microcavity collection enhancement approach to make quantum light sources suitable for future on- or off- chip quantum networks and photonic quantum emulators.