QuICHE: Quantum information and communication with high-dimensional encoding

与二维量子比特范式相比，高维（HD）光子量子信息（QI）具有相当大的优势，从提高量子通信速率到提高纠缠分发的鲁棒性。该项目旨在通过对光的光谱-时间（ST）自由度中的信息进行编码来释放HD QI的潜力。我们将开发匹配的实验工具和理论架构来操纵和表征这些状态，并将展示它们在应用中的用途。每个光束在其ST自由度上都有很大的信息编码容量，通过宽带光纤通信，这支撑了互联网的巨大容量。量子光束继承了这种能力，但这种能力尚未得到充分探索和利用。ST对光的量子态的控制使得能够在单个空间模式中复用QI，非常适合导波通信和集成器件。HD状态下的QI编码远远超出二维编码，已被认为是增强QI处理、通信和感测的有前途的方式。即使有越来越多的理论建议，但是，很少有实验证明这种能力。我们需要的是一个统一的理论方法，HD量子态是相关的真实的实验设备，占现实世界的缺陷，以解锁ST编码的HD QI处理的全部潜力。该项目将提供这样的共同努力，以弥合这一差距。我们将开展相关的理论和实验研究，以实现二体和多方场景中的安全通信，提高量子网络的性能，并开发维度证人，纠缠认证，量子态和信道属性估计以及量子计量学的有效方法。此外，我们将介绍和发展HD量子时间成像的新概念。实验实现将基于在非线性波导和电光器件中基于超快量子光学方法的时间和频率的新HD编码。将探索使用宽带场正交重叠脉冲模式以及不同的非重叠时间和频率仓的编码，并将其结合在一起以形成有效的混合编码网络。实验性地访问ST编码的HD潜力的关键将是使用量子时间成像的概念对时间尺度进行无噪声操纵。结合实验和理论的努力将产生一个统一的平台，高清，集成光学QI处理，通信和传感。

High-dimensional (HD) photonic quantum information (QI) promises considerable advantages compared to the two-dimensional qubit paradigm, from increased quantum communication rates to increased robustness for entanglement distribution. This project aims to unlock the potential of HD QI by encoding information in the spectral-temporal (ST) degrees of freedom of light. We will develop matched experimental tools and theoretical architectures for manipulating and characterizing such states, and we will demonstrate their use in applications. Every light beam has a large capacity for information coding in its ST degrees of freedom, which, through broadband optical fiber communications, underpins the massive capacity of the internet. Quantum light beams inherit this capacity, which has been as-of-yet underexplored and underutilized. ST control of quantum states of light enables multiplexing of QI in a single spatial mode, ideally suited for guided-wave communications and integrated devices. QI encoding in HD states, going well beyond two-dimensional encoding, has been recognized as a promising way towards enhanced QI processing, communication, and sensing. Even with an increasing number of theoretical proposals, there are, however, few experimental demonstrations of this capability. What is needed is a unified theoretical approach to HD quantum states that is relevant to real experimental devices, accounting for real-world imperfections in order to unlock the full potential of ST-encoded HD QI processing. This project will deliver such a joint effort to bridge this gap. We will carry out connected theoretical and experimental research to achieve secure communication in bipartite and multipartite scenarios, enhance the performance of quantum networks, and develop efficient methods for dimension witnesses, entanglement certification, estimation of properties of quantum states and channels, and quantum metrology. Moreover, we will introduce and develop the new concept of HD quantum temporal imaging. Experimental implementation will be based on novel HD encodings in time and frequency based on ultrafast quantum optical approaches in nonlinear waveguide and electro-optic devices. Encodings using broadband field-orthogonal overlapping pulse modes as well as distinct, non-overlapping time and frequency bins will be explored and brought together to form an effective hybrid-encoded network. Key to experimentally accessing the HD potential of the ST encoding will be the noiseless manipulation of time scales using the concepts of quantum temporal imaging. Combined experimental and theoretical efforts will yield a unified platform for HD, integrated optical QI processing, communication, and sensing.