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

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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.