Beyond nearest-neighbor coupling in spin qubits
The scaling of the transistor has been the industry standard for increasing computing power. However, physical device scaling is ultimately reaching its limits. Fundamental physical boundaries that prevent further scaling are expected to be reached. Therefore, an increasingly large effort has been devoted in researching novel computing mechanisms. Quantum computing presents itself as a potential solution by exploiting massive parallelism, that would push computational power far beyond what is accessible today. The electronic spin trapped within semiconductor quantum dots is considered one of the most promising carriers of quantum information, due to a low coupling to the environment and a mature semiconductor industry that can sustain huge development efforts. An important outstanding goal of quantum computing is manipulating and transporting spins over a long distance. This allows massive scaling up of the quantum computers while maintaining high operation fidelities. The long range coupling of spins opens up avenues for alternative coupling mechanisms aside local coupling such as charge shuttling and long distance exchange mechanisms. In this context, this thesis focuses on long range coherent spin transport and manipulation, using charge shuttles and indirect exchange interactions.