Advanced Entanglement from Quantum Dots

通信即将通过量子力学的使用而发生革命性的变化，这被称为第二次量子革命。这场革命的核心是利用纠缠态，这种纠缠态没有任何经典的类似物。因此，在这一努力中，有效地创建纠缠态是至关重要的，寻找理想的纠缠光子对来源的竞赛正处于顶峰。本项目的主要目标是提出半导体量子点作为纠缠光子对的可用来源。对于受控的双激子的产生和随后的时间绑定纠缠光子的确定性产生，一个新的角度被添加了一个根本的新成分，即暗激子态。我们将考虑利用单量子点和量子点分子高级创建时间绑定纠缠光子态，以及多能级纠缠和多光子纠缠。我们的目标是通过强大的理论和实验联合努力来实现这些目标，将量子点作为纠缠光子源的潜力转化为一套有用的量子通信工具，最终导致构建可用的量子中继器。

Communication is about to be revolutionized by the usage of quantum mechanics, known as the second quantum revolution. At the heart of this revolution are the exploitation of entangled states, which do not have any classical analogue. Therefore, the efficient creation of entangled states is crucial in this endeavor and the race of the search for the ideal source of entangled photon pairs is at its peak. The main goal of our project is to bring forward semiconductor quantum dots as usable source of entangled photon pairs. A new angle is added by a fundamentally new ingredient, namely the dark exciton states, for the controlled biexciton generation and subsequently the deterministic generation of time-bin entangled photons. We will consider advanced creation of time-bin entangled photon states, as well as multilevel entanglement and multiphoton entanglement using single quantum dots and quantum dot molecules. We aim to achieve these goals by a strong joint theoretical and experimental effort to turn the potential of quantum dots as entangled photon source into a useful set of tools for quantum communication, eventually leading to the construction of usable quantum repeaters.