Application of High-Fidelity, High-Speed Remote Entanglement of Trapped Ion Qubits to Fundamental Quantum Information Processing

俘获离子量子位的高保真、高速远程纠缠在基础量子信息处理中的应用

• 批准号: 2123252
• 金额: --
• 依托单位: University of Oxford
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2123252
• 关键词: Application; Fidelity; Speed; Remote; Entanglement

Trapped ions have many useful properties that make them a suitable candidate for the implementation of quantum algorithms, such as long coherence times and the ability to entangle them in a highly controllable way through the mutual Coulomb repulsion of the ions that mediates a coupling between them. However, the number of qubits must be significantly increased to render quantum information processing competitive with classical computers. The two most advanced proposals to scale trapped-ion quantum processors to larger numbers of qubits rely either on physically shuttling individual ions between different processor modules or photonic probabilistic links.In this regard, as a doctoral student, I aim to contribute to the progress at the scientific forefront of quantum information research and take part in the challenge to build a scaled-up ion trap quantum computer for the first time, adhering to the proposal involving photonic probabilistic links. Improvements on entanglement schemes between remote trapped ions are to be carried out. The fidelity of entanglement will be enhanced by a multi-detector scheme and using fibre networks. Employing the entanglement purification technique will allow to distil even higher fidelity entangled states that can be used to demonstrate controlled quantum dynamics over macroscopic distances, for example the two-qubit CNOT gate. The experiment might also enable state teleportation, remote state preparation and an implementation of the dense coding quantum information protocol. The entanglement generation rate will be improved by the installation of cavities that enhance the emission into the fibre mode, thereby increasing the photon collection efficiency. This research falls under the Quantum Technologies ESPRC Research Theme.

被捕获的离子具有许多有用的性质，使它们成为实现量子算法的合适候选者，例如长相干时间和通过离子的相互库仑排斥以高度可控的方式纠缠它们的能力，该离子介导它们之间的耦合。然而，量子比特的数量必须显着增加，以使量子信息处理与经典计算机竞争。将离子阱量子处理器扩展到更大数量的量子比特的两个最先进的方案要么依赖于在不同的处理器模块之间物理穿梭单个离子，要么依赖于光子概率链路。在这方面，作为一名博士生，我的目标是为量子信息研究的科学前沿做出贡献，并首次参与构建放大的离子阱量子计算机的挑战，坚持涉及光子概率链路的提议。远程囚禁离子之间的纠缠方案的改进进行。通过多探测器方案和使用光纤网络将增强纠缠的保真度。采用纠缠纯化技术将允许获得更高保真度的纠缠态，这些纠缠态可用于证明宏观距离上的受控量子动力学，例如双量子位CNOT门。该实验还可能实现状态传送，远程状态准备和密集编码量子信息协议的实现。通过安装增强进入光纤模式的发射的腔，将提高纠缠产生率，从而提高光子收集效率。这项研究属于量子技术ESPRC研究主题的福尔斯。