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，展示利用基于轨道角动量(OAM)的量子通信系统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用新型光子学技术，能够工作在光通信波长的光子晶体表面发射激光器(PCSEL)和低噪声雪崩光电二极管(ALD)。量子信息是围绕量子比特的使用而形成的，量子比特是对标准比特的量子类比。这是一个两级的二进制系统，这是众所周知的，已经使用了很多年。目前正在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基石。然而，两能级系统本质上限制了量子系统中可以携带的信息密度。量子信息的高维希尔伯特态存在，被称为量子信息，它有两个以上的离散状态，可以携带更多的信息。QUDITS项目正在为潜在的破坏性未来通信系统开发一个新的量子技术领域，这将极大地提高最先进的水平。它将展示从英国供应链的商业可得组件中生成和检测量子位数的可行性。量子比特是通信系统的一种自然放大技术，使更多的数据驻留在一个量子状态上，而不是必须发送更多的量子比特。

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.