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，为整个社会带来变革性的变化，这将解决目前难以解决的复杂多体问题。它将在金融、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潜在的进步。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，其中振荡电场用于限制离子，这些离子作为量子比特用于编码量子信息。这种方法提供了一种扩大量子比特数量的途径，从而实现最终所需的计算能力的增加，使该技术能够从基于实验室的小规模实验环境发展到日常使用的集成用户友好系统。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，这些不同的要求由各种激光源来满足，每种激光源都具有不同的波长和性能要求。ADRENALIN项目将开发一种新型激光器，光子晶体表面发射激光器（PCSEL），用于QT应用。PCSEL采用光子晶体来产生2阶面外衍射，并实现垂直单频发射。与其他激光二极管相比，这种新颖的器件架构提供了出色的光束质量，并显著降低了制造成本。PCSEL还可以配置为具有可操纵的可单独寻址输出的2D阵列，从而能够同时寻址不同的晶格位点。此外，这些器件可以在大多数III-V族半导体中制造，从而可以解决QT应用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位，从而实现计算能力的指数级增长和该技术的更广泛应用。PCSEL还将有助于推动QT应用的快速发展-这对TIQC很重要，但也是开发用于便携式高精度计时的微型原子钟的关键驱动力，从而使该技术得到更广泛的采用，并为运输，国防和通信领域的重大改进提供了潜力。在这两种应用中，PCSELs将最终取代通常依赖于相对笨重、昂贵和复杂的外腔激光器的现有光源，并将成为未来QT系统中的重要组件。

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.