aiqbench takeQuantum Computing

This study demonstrates significant intervalley mixing in silicon MOSFETs, a critical step toward realizing compact quantum Hall interferometers and scalable valley-based qubits. By confirming negligible spin-flip scattering while achieving near-complete equilibration between edge channels, the research validates silicon as a viable platform for stable topological quantum devices beyond traditional gallium arsenide systems.

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Si-MOSFET Achieves 90% Intervalley Mixing in Silicon Quantum Hall Channels

Quantum ZeitgeistJuly 20, 20266 min read

Researchers observed 90% intervalley mixing in copropagating edge channels of a silicon MOSFET, demonstrating potential for valley-based quantum devices within the realm of the Quantum Hall effect.

Researchers at NTT, Inc. have demonstrated a high degree of interaction within silicon quantum Hall channels, with a transition probability close to 1, indicating nearly complete equilibration between two valley edge channels. This result, obtained using a double-layer-gated silicon metal-oxide-semiconductor field-effect transistor, brings the creation of compact silicon quantum Hall interferometers closer to realization. The experiment brought spin-polarized valley edge channels into close proximity, revealing that interchannel transport between channels with differing spin orientations showed negligible transition probability, confirming the suppression of spin-flip scattering expected in silicon. These findings demonstrate that intervalley coupling at a silicon/silicon dioxide interface can function as a beam-splitter, establishing a key component for future quantum devices. Nearly complete equilibration between valley edge…

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