Towards a Logical Qubit in Silicon: Scalable 2-qubits Operations in CMOS-compatible Quantum Dots

迈向硅中的逻辑量子位：CMOS 兼容量子点中的可扩展 2 量子位操作

• 批准号: 2578471
• 金额: --
• 依托单位: University College London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2578471
• 关键词: Towards; Logical; Qubit; Silicon; Scalable

Quantum computing holds the promise to solve intractable problems in various domains, such as drug designs, material science or data prediction. Several hardware platforms are being investigated to host quantum computers, and it is still unclear which scheme will be optimal for computation. Spin qubits in silicon quantum dots are promising candidates given their large qubit density and their compatibility with the silicon-CMOS industry. However, some key building blocks toachieve a silicon-based quantum computer are still to be demonstrated. In particular, realising coherent control of quantum-dot qubits in a two-dimensional array remains to be shown. This requires careful thinking of architectural elements such as sensors, one-qubit gate and two-qubit gate elements to guarantee coherence along with selective control. For this PhD, we look to construct the first silicon spin qubits array displaying coherent two-qubit gates in the two dimensions of the plane, in devices fabricated in industrial foundry. This will be an essential ingredient to building an error-corrected unit cell of silicon qubits, and will pave the way to industrially-scalable quantum processors. Such project is challenging due to the noisy interaction between the quantum dots defining the qubits, enhanced when increasing the dimensions of the qubit array. This PhD will build on the expertise of Prof. John Morton's research group on sensing and controllingsilicon spin qubits in linear arrays, with the aim to achieve coherent control of entanglement in 2D spin qubits array.

量子计算有望解决各个领域的棘手问题，如药物设计，材料科学或数据预测。目前正在研究几种硬件平台来托管量子计算机，目前还不清楚哪种方案最适合计算。硅量子点中的自旋量子位是有希望的候选者，因为它们具有大的量子位密度和与硅CMOS工业的兼容性。然而，实现硅基量子计算机的一些关键构建模块仍有待证明。特别是，在二维阵列中实现量子点量子比特的相干控制仍有待展示。这需要仔细考虑架构元素，如传感器，单量子位门和双量子位门元素，以保证沿着的选择性控制。对于这个博士学位，我们希望构建第一个硅自旋量子位阵列，在平面的两个维度上显示相干的两个量子位门，在工业铸造厂制造的设备中。这将是构建硅量子比特纠错单元的重要组成部分，并将为工业可扩展的量子处理器铺平道路。由于定义量子位的量子点之间的噪声相互作用，当增加量子位阵列的尺寸时，这种相互作用会增强，因此这种项目具有挑战性。这个博士学位将建立在John Morton教授的研究小组在线性阵列中感测和存储硅自旋量子比特的专业知识的基础上，旨在实现2D自旋量子比特阵列中纠缠的相干控制。