Valley splitting correlations across a silicon quantum well containing germanium.

ABSTRACT: Quantum dots in SiGe/Si/SiGe heterostructures host coherent electron spin qubits, which are promising for future quantum computers. The silicon quantum well hosts near-degenerate electron valley states, creating a low-lying excited state that is known to reduce spin qubit readout and control fidelity. The valley energy splitting is dominated by the microscopic disorder in the SiGe alloy and at the Si/SiGe interfaces, and while Si devices are compatible with large-scale semiconductor manufacturing, achieving a uniformly large valley splitting energy across a many-qubit device spanning mesoscopic distances is an outstanding challenge. In this work we study valley splitting variations in a 1D quantum dot array, formed in a Si_0.972Ge_0.028 quantum well, manufactured by Int

SUBMITTER: Marcks JC 

PROVIDER: S-EPMC12727835 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature