Regensburg 2025 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 36: Materials and Devices for Quantum Technology II
HL 36.3: Vortrag
Mittwoch, 19. März 2025, 15:30–15:45, H13
Single-Electron Shuttling for Scalable Silicon Quantum Computers: Modeling, Simulation and Optimal Control — •Lasse Ermoneit1, Burkhard Schmidt1, Thomas Koprucki1, Jürgen Fuhrmann1, Tobias Breiten2, Arnau Sala3, Nils Ciroth3, Ran Xue3, Lars R. Schreiber3,4, and Markus Kantner1 — 1Weierstrass Institute, Berlin, Germany — 2Technical University Berlin, Germany — 3JARA-FIT Institute for Quantum Information, Forschungszentrum Jülich GmbH and RWTH Aachen University, Germany — 4ARQUE Systems GmbH, Aachen, Germany
While spin qubits in gate-defined Si/SiGe quantum dots provide excellent prospects for scalability, the lithographic processing, signal routing and wiring of large qubit arrays at a small footprint pose a significant challenge. A potential solution is to divide the qubit register into compact, dense qubit arrays linked by an interconnecting quantum bus shuttle, that allows for coherent transfer of quantum information by physically moving electrons along a channel. Limitations in qubit shuttling fidelity arise from the interaction of the electron with material defects within the channel that can cause non-adiabatic transitions to excited orbital states. Since those have an altered effective g-factor, this leads to a spin precession with an indeterministic phase. In this contribution, we theoretically explore the capabilities for bypassing defect centers using optimally engineered control signals that allow for a quasi-adiabatic passage of the electron through the channel without reducing the shuttling velocity. Our approach is based on quantum optimal control theory and Schrödinger wave packet propagation.
Keywords: silicon qubits; optimal control; device simulation; quantum dots; quantum computing