2018/09/21 by A. M. Jones, A.M. Jones, E. J. Pritchett +31 · 1 citation
Engineering · Physics and Astronomy · #Advancements in Semiconductor Devices and Circuit Design #Degrees of freedom (physics and chemistry) #Energy (signal processing) #Excited state #Measure (data warehouse) #Quantum and electron transport phenomena #Quantum dot #Semiconductor Quantum Structures and Devices #Spectroscopy #Spin (aerodynamics) #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevapplied.12.014026
published as Phys. Rev. Applied 12, 014026 (2019) · 18 pages, 9 figures
arxiv created 2018/09/21 · openalex created_date 2019/06/27 · openalex publication_date 2019/07/15 · arxiv updated 2019/07/31 · openalex updated_date 2026/08/05
Singlet-triplet spin states of a quantum dot support promising semiconductor-based qubits, yet often suffer from poor state preparation and measurement, due to low-lying excited states. Engineering a large energy splitting is impeded by the inability to accurately measure both large and small energy splittings with the device biased to nominal operation. The authors present a measurement and fitting approach that accurately extracts both large and small splittings in this regime. They also find evidence that both orbital and valley degrees of freedom may set this energy separation, significantly affecting which paths to pursue in device design.