Enhanced Quantum Dot Sources and Optical Atomic Memories for Telecommunication InterConnectivity

用于电信互连的增强型量子点源和光学原子存储器

• 批准号: EP/Z000548/1
• 负责人: Patrick Ledingham
• 金额: $ 53.54万
• 依托单位: University of Southampton
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2024
• 资助国家: 英国
• 起止时间: 2024 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FZ000548%2F1
• 关键词: Enhanced; Quantum; Dot; Sources; Optical

Several photonic quantum communication and network implementations require the development of key elements such as deterministic sources of quantum light as well as quantum memories. Currently, semiconductor quantum dots operating at telecom wavelength represent a very appealing system for the generation of single and entangled photons with high brightness at appropriate wavelengths. However, storing quantum information in quantum dots is currently difficult. On the other hand, warm atomic vapours constitute an attractive platform for storing single photons, though it is more challenging to use them for deterministic photon generation. Here we plan to realise a hybrid quantum system employing telecom-wavelength quantum dots for generating entangled photon pairs, and a warm atomic off resonant cascaded absorption (ORCA) memory to store single photons from the entangled pairs. This will represent a key demonstration for the realistic implementation of quantum networks outside of the lab environment. Building on this, we aim to perform experiments on deployed fibres, measuring entanglement between photons stored in the atomic memory and others propagating in the fibre network at long distance. Here we will tackle several applied research challenges when distributing polarisation entanglement over long distances via silica fibres. In addition, the quantum dot entangled-photon source as well as the atomic memory will be highly optimised to function together to form an effective hybrid quantum system.

几种光子量子通信和网络的实现需要开发关键元件，例如量子光的确定性源以及量子存储器。目前，在电信波长下工作的半导体量子点代表了一种非常有吸引力的系统，可以在适当的波长下产生高亮度的单光子和纠缠光子。然而，目前在量子点中存储量子信息很困难。另一方面，温暖的原子蒸气构成了存储单光子的一个有吸引力的平台，尽管将它们用于确定性光子生成更具挑战性。在这里，我们计划实现一个混合量子系统，采用电信波长量子点来生成纠缠光子对，并使用热原子非共振级联吸收（ORCA）存储器来存储来自纠缠对的单个光子。这将是在实验室环境之外实际实施量子网络的关键演示。在此基础上，我们的目标是在部署的光纤上进行实验，测量存储在原子存储器中的光子与在光纤网络中长距离传播的其他光子之间的纠缠。在这里，我们将解决通过二氧化硅光纤长距离分布偏振纠缠时的几个应用研究挑战。此外，量子点纠缠光子源和原子存储器将经过高度优化，共同发挥作用，形成有效的混合量子系统。