Two-qubit interactions in two spatial dimensions in silicon

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Quantum computing platforms that aim to become fault-tolerant via the use of quantum correction protocols require high qubit connectivity. For the surface code, the most forgiving quantum error correction protocol, qubits will need to interact controllably with nearest neighbours located in a two-dimensional array.In this PhD project, you will work towards demonstrating for the first time two-qubit interactions in two spatial dimensions in silicon spin qubit devices. Electron spin qubits in silicon are consolidating their position as a leading candidate to build scalable high-fidelity quantum processors since several recent demonstrations have shown single- and two-qubit gate fidelities exceeding the requirements for fault tolerant thresholds. However, all devices up to now have shown interactions only in 1d. In this PhD project, you will design and validate industry-manufactured silicon devices that will allow you to use spin-spin exchange interaction between neighbour spins in a 2d array to implement two-qubit gates in silicon. A positive outcome of this project will facilitate the development of fault-tolerant silicon-based quantum processors.