FIP PHYSICS MATTERS: Building small, fast and hot Si spin qubits

Building small, fast and hot Si spin qubits
Speaker: Dominik Zumbühl, University of Basel

Quantum computers promise to execute complex tasks exponentially faster than any possible classical computer. Qubits based on hole spins in 1D Ge/Si nanowire are predicted to experience an exceptionally strong yet electrically tunable spin–orbit interaction. Here we used small gate voltage changes to tune the Rabi frequency and the driven coherence time by about a factor of 7, and its Landé g-factor by 50%. We can thus tune from a fast manipulation to an idle mode, demonstrating a spin–orbit switch. Finally, we used this control to optimize our qubit further and approach the strong driving regime, with spin-flipping times as short as ~1 ns

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