Coherent Spin Qubit Transport in Silicon*

The ability to transport electrons across large distances will improve greatly the scalability of quantum computing systems by paving the way for fault-tolerant architectures that has a lower required number of physical qubits while allowing for long distance interactions between qubits. To this end, we demonstrated the ability to transport a single spin qubit within a double quantum dot in silicon, reporting a 99.97% polarisation transfer fidelity and a 99.4% average coherent transfer fidelity. This experimental feat also opens up questions from a theoretical perspective on the sources of error and what it could mean for further work.
In this talk, I will highlight these achievements and discuss the theoretical aspects of coherent spin transport in the context of these experimental results. We believe that these results are instrumental in demonstrating the scalability of silicon-based spin qubits.