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Researchers at QuTech have demonstrated that electrostatic confinement can significantly enhance valley splitting in silicon quantum wells to 760µeV, addressing a critical stability issue for spin qubits. This breakthrough establishes a design pathway toward scalable architectures using shuttling and sparse-occupation techniques within low-disorder heterostructures. The findings confirm a tunable relationship between orbital energy and valley splitting, offering new levers for optimizing qubit performance in silicon-based quantum computing platforms.

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QuTech Silicon Qubits Achieve 760µeV Valley Split via Confinement

Quantum ZeitgeistJuly 13, 20266 min read

Researchers at QuTech achieved 760µeV valley splitting in silicon quantum wells, a key step for more robust spin qubits.

Researchers at QuTech and the University of Wisconsin-Madison have demonstrated an increase in valley splitting within silicon quantum wells, achieving 760µeV through electrostatic confinement, a critical step toward more stable qubits. The team reports measuring an average valley splitting of 0.40(6) meV and a singlet-triplet splitting of 0.24(7) meV across a linear array of four quantum dots. This work reveals a relationship between valley splitting and orbital energy, with an average linear coefficient of approximately 0.22 meV/meV, suggesting a pathway to tailor qubit performance through design. These findings demonstrate that strong confinement can enhance valley splitting, establishing a path toward scalable, shuttling-based quantum architectures in low-disorder heterostructures. A correlation…

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