Memory-Enhanced Entanglement Distribution with Gallium ARsenide quantum Dots

砷化镓量子点的记忆增强纠缠分布

• 批准号: EP/Z000556/1
• 负责人: Dorian Gangloff
• 金额: $ 53.53万
• 依托单位: University of Cambridge
• 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%2FZ000556%2F1
• 关键词: Memory; Enhanced; Entanglement; Distribution; Gallium

Communication networks that use the quantum properties of photons and matter for transferring data are fundamentally more secure than traditional networks and will become indispensable in the coming era of quantum information processing. The fundamental building block for such a quantum network is a node where flying photonic qubits and stationary matter qubits can exchange information efficiently and with high fidelity. While multiple prospective platforms exist, semiconductor quantum dots (QDs) stand out owing to their optical properties: they are the brightest and most coherent quantum emitters in the solid-state. Remarkable improvements of electronic- and nuclear-spin coherence in QDs recently put forward by the applicants have further strengthened the case for placing this system as the focus of a concerted effort towards a device capable of a full hardware stack demonstration.We propose to combine the expertise of multiple research groups with complementary skills and foci to achieve an all-in-one device delivery: a semiconductor QD system capable of producing entanglement between a matter qubit and a photonic qubit and storing this information with 90% fidelity for 100 milliseconds, a 105 improvement over previous QD-based results. We will deliver this with tailored and theory-guided QD growth and post-growth control to optimise optical and spin properties, which we will verify in spectroscopic measurements. We will integrate such a QD device with (1) a strain-engineering platform - allowing tuning of the interaction between an electron spin qubit and a nuclear register; (2) an optical micro-cavity - allowing efficient photon coupling; and (3) radiofrequency antennas - allowing dynamical decoupling of the nuclear spin register for 100 ms. Each academic member of our consortium has produced multiple results on the above foundational elements either separately or within bi-/tri-lateral informal collaborations; this project will provide the resources to bring members together and leverage their existing resources to produce a unique and highly impactful quantum device demonstration. An industrial partner, with expertise on wafer-scale heterogeneous integration, will contribute to the development of scalable fabrication processes. MEEDGARD's success would have direct ramifications for future investment in semiconductor-based quantum networking.

利用光子和物质的量子特性传输数据的通信网络从根本上比传统网络更安全，在即将到来的量子信息处理时代将变得不可或缺。这种量子网络的基本构建块是一个节点，在这个节点上，飞行的光子量子比特和静止的物质量子比特可以高效地、高保真地交换信息。虽然存在多种前景平台，但半导体量子点（QD）由于其光学特性而脱颖而出：它们是固态中最明亮和最相干的量子发射器。申请人最近提出的量子点中电子和核自旋相干性的显著改进进一步加强了将该系统作为能够进行完整硬件堆栈演示的设备的协同努力的焦点的理由。我们建议将多个研究小组的专业知识与互补的技能和焦点结合联合收割机以实现一体化设备交付：一个半导体量子点系统，能够在物质量子位和光子量子位之间产生纠缠，并以90%的保真度存储此信息100毫秒，比以前基于量子点的结果提高了105。我们将通过量身定制和理论指导的QD生长和生长后控制来实现这一目标，以优化光学和自旋特性，我们将在光谱测量中进行验证。我们将把这样的量子点器件与（1）一个应变工程平台--允许调整电子自旋量子比特和核寄存器之间的相互作用;（2）一个光学微腔--允许有效的光子耦合;及（3）射频天线-允许核自旋寄存器的动态去耦100毫秒。我们联盟的每个学术成员都产生了多个结果，上述基本要素单独或在双边/三边非正式合作中;该项目将提供资源，将成员聚集在一起，并利用其现有资源制作独特且具有高度影响力的量子设备演示。拥有晶圆级异构集成专业知识的工业合作伙伴将为可扩展制造工艺的开发做出贡献。MEEDGARD的成功将对未来基于量子网络的投资产生直接影响。