2021/01/24 by Y. -Y. Liu, Y.-Y. Liu, L. A. Orona +7
Materials Science · Physics and Astronomy · #Chemical and Physical Properties of Materials #Coupling (piping) #Degeneracy (biology) #Magnetic field #Measure (data warehouse) #Quantum and electron transport phenomena #Qubit #Scaling #Semiconductor Quantum Structures and Devices #Spin (aerodynamics) #Spin engineering #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevapplied.16.024029
published as Phys. Rev. Applied 16, 024029 (2021) · 4 figures
arxiv created 2021/01/24 · openalex created_date 2021/02/01 · openalex publication_date 2021/08/17 · arxiv updated 2021/08/25 · openalex updated_date 2026/08/05
Silicon-based spin qubits are of significant interest in quantum information processing, due to their small size and potential for scalability. Implementations have been hindered, though, by the presence of electronic valley degeneracy (which causes spin decoherence) and by silicon's weak spin-orbit coupling (which necessitates complicated micromagnet fabrication to create a magnetic field gradient). The authors measure the valley spectrum of a double-quantum-dot device, and establish two-axis control of a singlet-triplet qubit using the artificial magnetic field gradient generated by the valley subspace. This carries important ramifications for scaling up silicon-based spin qubits.