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Overlapping Aluminum-Gate Quantum Dots for Valley-Orbit Based Qubits in Si/SiGe
Date: Wednesday, April 14th
Time: 4:00 pm
Place: https://teams.microsoft.com/l/meetup-join/19%3ameeting_MGQ3ODlmN2UtYjRhZC00ZmEzLWFkNmQtOWM2NTAwNDUwN
Speaker: JP Dodson, Physics PhD Graduate Student
Abstract: Variability in valley-orbit state splittings will be a problem for large-scale implementations of silicon-based quantum processors. Depending on the particular qubit architecture, the role of valley-orbit states varies; however, a common theme for nearly all silicon-based qubits is that valley-orbit splittings must be precisely engineered or have large in situ tunability. Here, we investigate overlapping aluminum-gate devices for valley-orbit based qubits in Si/SiGe which enable high in situ tunability of valley-orbit states. Spectroscopic measurements of low-lying one- and two-electron valley-orbit states are taken to determine the quantitative relationship between the valley, singlet-triplet and orbital splittings. By exploiting the dependence of valley-orbit state splittings on electrostatic confinement and electron number, we show progress towards single-shot readout in the (4,1)-(3,2) electron regime, allowing for in situ tunability of the qubit frequency and enhancement of the readout window. https://teams.microsoft.com/l/meetup-join/19%3ameeting_MGQ3ODlmN2UtYjRhZC00ZmEzLWFkNmQtOWM2NTAwNDUwNDI0%40thread.v2/0?context=%7b%22Tid%22%3a%222ca68321-0eda-4908-88b2-424a8cb4b0f9%22%2c%22Oid%22%3a%2261f2b766-a8e8-4b5b-9783-d4da1ab09cae%22%7d
Host: Mark Eriksson, Faculty Advisor
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