QUantum communication Development with Increased Throughput for information Systems (QUDITS)

QUDITS项目是一项可行性研究，旨在开发一个演示平台，以展示使用基于轨道角动量（OAM）的qudits开发量子通信系统的可行性。通过使用来自英国供应链的商业上可用的新型光子学技术，光子晶体表面发射激光器（PCSEL）和低噪声雪崩光电二极管（ALD），能够在光通信波长下工作。量子信息围绕量子比特的使用而形成，量子比特是标准比特的量子类比。这是一个两级的二元系统，这是众所周知的，并已使用多年。目前商业化的所有量子技术都是基于量子比特作为量子信息的构建块。然而，二能级系统固有地限制了量子系统中可以携带的信息的密度。量子信息的高维希尔伯特态存在，称为量子点，并且具有两个以上的离散态，可以携带更多的信息。量子点项目正在开发一个新的量子技术领域，用于潜在的破坏性未来通信系统，这将大大提高最先进的水平。它将证明从英国供应链的商业可用组件生成和检测量子点的可行性。Qudits是通信系统的自然扩展技术，使更多的数据驻留在一个量子态上，而不必发送更多的量子位。

Project QUDITS is a feasibility study which aims to develop a demonstrator platform to showcase the feasibility of developing quantum communication systems using qudits based on orbital angular momentum (OAM). By using using commercially available novel photonics technologies from the UK supply chain, photonic crystal surface-emitting lasers (PCSELs) and low-noise Avalanche Photo-Diodes (ALDs), able to operate at optical communications wavelengths.Quantum information is shaped around the use of qubits, the quantum analogy to the standard bit. This is a two-level, binary system, which is well known and has been used for many years. All quantum technologies currently being commercialised are based on qubits as the building block of quantum information. However, a two-level system inherently limits the density of information that can be carried in a quantum system. Higher dimensional Hilbert states of quantum information exist, known as qudits, and have more than two discrete states and can carry more information.The QUDITS project is developing a new area of quantum technologies for a potentially disruptive future communication system that will greatly enhance the state-of-the-art. It will demonstrate the feasibility of generating and detecting qudits from commercially available components from the UK supply chain. Qudits are a natural scale up technology for communication systems, enabling more data to reside on one quantum state, instead of having to send more qubits.