Integrated Quantum Frequency Combs for Cluster States Generation

用于生成簇态的集成量子频率梳

• 批准号: EP/V062492/1
• 负责人: Lucia Caspani
• 金额: $ 46.66万
• 依托单位: University of Strathclyde
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FV062492%2F1
• 关键词: Integrated; Quantum; Frequency; Combs; Cluster

Quantum computing, once a purely theoretical dream, is becoming a reality. The last two years - 2019 and 2020 - have seen the first demonstrations of quantum advantage, that is, quantum computers performing tasks that cannot be solved by any classical supercomputer in a reasonable time. Among the competing technologies, photonics and superconducting circuits are the only two that reached quantum advantage. In both cases, the challenge ahead is scalability: the current quantum machines can only process a limited number of quantum bits, limiting their application to the solution of proof-of-concept problems.This project aims to develop a highly complex quantum state, called cluster state, that underpins a scalable approach to photonic quantum computing. Such a state, to be useful, must live on miniaturised components fabricated by a mature technology that supports scalability with increased complexity and commercial viability. Integrated photonics satisfies both these requirements. It can count on a large selection of tools and devices developed during the last forty years for telecommunications and data processing and employs the latest technologies that connect classical computers.This project will use the latest discoveries and technologies of integrated photonics for realising the generation of the aforementioned cluster states on-chip.One of the more recent and striking successes of integrated photonics is the realisation of frequency combs on-chip (microcombs). Frequency combs, electromagnetic fields composed by many equidistant frequencies (light colours), are a powerful resource for metrology and spectroscopy. Their miniaturisation via integrated photonics transformed them from cumbersome bulk systems to few millimetres squared chips, making integrated frequency combs one of the most promising photonic technologies.Frequency combs feature thousands to millions of modes and land themselves naturally to host the cluster states required for scalable quantum computation. To transform an integrated frequency comb into a cluster state all its frequency modes must be entangled, that is, sharing the same quantum state. Here, I propose a research programme that tackles this very problem: generating an integrated cluster state based on frequency combs.The research developed in this proposal will disclose the potential of integrated quantum frequency combs for quantum computing. This will boost a number of applications identified as strategic by the UK Government and Research Councils such as clock synchronisation and the deployment of quantum technologies.

量子计算，曾经是一个纯理论的梦想，正在成为现实。过去两年（2019年和2020年）首次展示了量子优势，也就是说，量子计算机可以在合理的时间内执行任何经典超级计算机无法解决的任务。在竞争技术中，光子学和超导电路是仅有的两个达到量子优势的技术。在这两种情况下，未来的挑战都是可扩展性：目前的量子机器只能处理有限数量的量子比特，限制了它们在解决概念验证问题上的应用。该项目旨在开发一种高度复杂的量子态，称为集群态，它是光子量子计算可扩展方法的基础。这种状态要想有用，必须依赖于由成熟技术制造的小型化组件，这种技术支持可扩展性，同时增加复杂性和商业可行性。集成光子学满足这两个要求。它可以依靠在过去四十年中为电信和数据处理开发的大量工具和设备，并采用连接经典计算机的最新技术。该项目将使用集成光子学的最新发现和技术来实现上述芯片上簇态的生成。集成光子学最近取得的显著成就之一是芯片上频率梳（microcomb）的实现。频率梳，由许多等距离频率（浅色）组成的电磁场，是计量学和光谱学的强大资源。集成光子学将它们从笨重的体积系统转变为几平方毫米的芯片，使集成频率梳成为最有前途的光子技术之一。频率梳具有数千到数百万种模式，并且可以自然地承载可扩展量子计算所需的集群状态。为了将一个集成的频率梳转换成簇态，它的所有频率模式必须是纠缠的，即共享相同的量子态。在这里，我提出了一个解决这个问题的研究方案：基于频率梳生成一个集成的集群状态。本提案的研究将揭示集成量子频率梳用于量子计算的潜力。这将推动英国政府和研究委员会确定的一些战略应用，如时钟同步和量子技术的部署。

项目成果

Electro-Optical Sampling of Single-Cycle THz Fields with Single-Photon Detectors.

• DOI: 10.3390/s22239432
• 发表时间: 2022-12-02
• 期刊: Sensors (Basel, Switzerland)
• 作者: Shields T;Dada AC;Hirsch L;Yoon S;Weaver JMR;Faccio D;Caspani L;Peccianti M;Clerici M
• 通讯作者: Clerici M