Fast Gates

快速门

• 批准号: 2749977
• 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: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2749977
• 关键词: Fast; Gates

Trapped-ion devices have demonstrated, on a small number of qubits, all the building-blocks required to build a quantum computer with precision better than any competing technology. However the speed of these devices, limited by the entangling gates, has not increased commensurately. The aim of this project is to change this by exploiting optical phase control to significantly speed up trapped-ion entangling gates whilst also removing several currently limiting fundamental sources of error.In preliminary work, we have recently demonstrated the first high-speed entangling logic gates for trapped-ion qubits [Schafer et al., Nature 555, 75 (2018)]. We achieved a fidelity of 99.8% for a 1.6 microsecond gate time, close to the highest reported two-qubit gate fidelities of 99.9%, but more than an order of magnitude faster. Over the course of this project we will extend this proof-of-concept technique to demonstrate the first high-speed control of multi-qubit registers.The project will involve both experimental and theoretical work, including:- developing and numerically modelling phase-controlled fast entangling gate dynamics- building a new apparatus optimised for high-speed multi-qubit entangling gates- sophisticated classical control techniques to precisely control the optical interaction phase of multi-qubit register

囚禁离子设备已经在少量的量子比特上展示了建造精度高于任何竞争技术的量子计算机所需的所有构件。然而，这些设备的速度受到纠缠之门的限制，并没有相应地增加。这个项目的目的是通过利用光学相位控制来显著加快囚禁离子纠缠门的速度，同时消除几个目前限制的基本误差源。在初步工作中，我们最近展示了第一个用于囚禁离子量子比特的高速纠缠逻辑门[Schafer等人，自然555，75(2018)]。我们在1.6微秒的门时间内实现了99.8%的保真度，接近报道的最高两量子位门保真度99.9%，但速度快了一个数量级以上。在这个项目的过程中，我们将扩展这一概念验证技术，以演示第一次高速控制多量子比特寄存器。该项目将涉及实验和理论工作，包括：-开发和数字建模相位控制快速纠缠门动力学-建立一个优化的新装置，用于高速多量子比特纠缠门-复杂的经典控制技术，以精确控制多量子比特寄存器的光学相互作用阶段