ADRENALIN (lAser Diodes in the veRy nEar iNfrared for quantum AppLIcatioNs )

量子计算是一项迅速兴起的技术，通过提供计算能力的巨大改进，将解决目前难以解决的复杂多体问题，为整个社会带来革命性的变化。它可能会在金融、气候变化、基础设施规划、药物发现、安全通信和材料科学等多个领域带来进步。捕获离子量子计算（TIQC）系统是最先进和最有前途的量子计算平台之一，它使用振荡电场来限制离子，这些离子作为用于编码量子信息的量子比特。这种方法为扩大量子位的数量提供了一条途径，从而提供了最终所需的计算能力的增加，从而使该技术从小规模的基于实验室的实验环境发展到日常使用的集成用户友好型系统。激光源是TIQC的关键要求，执行基本的系统功能，包括电离，冷却，再泵浦和光谱。通常，这些不同的要求由广泛的激光源来满足，每个激光源都有不同的波长和性能要求。肾上腺素项目将开发一种新型激光器，一种用于QT应用的光子晶体表面发射激光器（PCSEL）。PCSELs采用光子晶体产生二阶面外衍射，并实现垂直单频发射。与其他激光二极管相比，这种新颖的器件结构提供了出色的光束质量，并显着降低了制造成本。PCSELs也可以配置为二维阵列，具有可操纵的单个可寻址输出，使不同的点阵位置可以同时寻址。此外，这些器件可以在大多数III-V半导体中制造，从而可以解决QT应用程序中使用的大多数波长范围。PCSEL器件的许多优点将有助于促进下一代TIQC系统的扩展，以适应更大数量的量子比特，从而使计算能力呈指数级增长，并使该技术得到更广泛的应用。PCSEL还将有助于推动QT应用的小型化——这在TIQC中很重要，但也是便携式高精度计时的微型原子钟发展的关键驱动因素，使该技术得到更广泛的采用，并为运输、国防和通信领域的显著改进提供潜力。在这两种应用中，PCSELs最终将取代现有的光源，这些光源通常依赖于相对笨重、昂贵和复杂的外腔激光器，并将成为未来QT系统的重要组成部分。

Quantum computing is a rapidly emerging technology offering transformative changes to society as a whole by providing vast improvements in computational capability that will solve complex many-body problems that are currently intractable. It will potentially deliver advancements in diverse fields such as finance, climate change, infrastructure planning, drug discovery, secure communications and material science.Trapped-ion Quantum Computing (TIQC) systems are one of the most advanced and promising quantum computing platforms in which an oscillating electric field is used to confine ions which serve as the qubits used to encode quantum information. This approach offers a route towards scaling up the number of qubits and thereby delivering the increase in computing power that is ultimately desired, allowing the technology to emerge from small scale lab-based experimental environments to integrated user-friendly systems for everyday use. Laser sources are a key requirement in TIQC, performing essential system functions including ionisation, cooling, repumping and spectroscopy. Typically these different requirements are served by a wide range of laser sources, each with different wavelengths and performance requirements.The ADRENALIN project will develop a novel type of laser, a Photonic Crystal Surface Emitting Lasers (PCSEL) for use in QT applications. PCSELs employ photonic crystals to produce 2nd order out-of-plane diffraction and enable vertical, single-frequency emission. This novel device architecture provides excellent beam quality compared to other laser diodes and significantly reduces manufacturing costs. PCSELs can also be configured in 2D arrays with steerable individually addressable output, enabling different lattice sites to be addressed simultaneously. In addition these devices can be manufactured in most III-V semiconductors, allowing most of the wavelength range used in QT applications to be addressed.The many advantages of the PCSEL device will help facilitate scaling in next generation TIQC systems to accommodate larger numbers of qubits thereby enabling exponential increases in computational power and more widespread utilisation of the technology. The PCSEL will also help drive miniaturisation in QT applications -- this is important in TIQC but is also a key driver in the development of miniature atomic clocks for portable high-precision time-keeping, enabling a more widespread adoption of the technology and providing the potential to significantly advance improvements in transportation, defence and communication sectors. In both applications, PCSELs will ultimately displace incumbent light sources which typically rely on relatively bulky, expensive and complicated external cavity lasers and will become essential components in future QT systems.