Building Small, Fast and Hot Si Spin Qubits

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• Dominik Zumbühl, University of Basel
• Friday 04 March 2022, 16:00-17:00
• http://tinyurl.com/domzum.

If you have a question about this talk, please contact Mrs Charlotte Jenkins.

Note that the talk will now not take place in person, but will be on Zoom.

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.

One of the greatest challenges in quantum computing is achieving scalability. Classical computing previously faced a scalability issue, solved with silicon chips hosting billions of fin field-effect transistors (FinFETs). Here, we show that silicon FinFETs can host spin qubits operating above 4 K, potentially allowing in-situ integration of qubit control electronics. We achieve fast electrical control of hole spins with driving frequencies up to 150 MHz, single-qubit gate fidelities at the fault-tolerance threshold, and a Rabi oscillation quality factor greater than 87. Our devices feature both industry compatibility and quality, and are fabricated in a flexible and agile way that should accelerate further development.

This talk is part of the Semiconductor Physics Group series.

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