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QI: Fachverband Quanteninformation
QI 14: Quantum Information Poster Session
QI 14.24: Poster
Mittwoch, 11. März 2026, 18:00–21:00, P4
Industrially fabricated and isotopically enriched Si/SiGe Quantum Dots for coherent spin qubit control — •Dominic Barthlott1, Viktor Adam1, Daniel Sitter1, Daniel Schroller1, Clement Godfrin2, and Wolfgang Wernsdorfer1 — 1Physikalisches Institut (PHI), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany — 2Interuniversity Microelectronics Centre (imec), Leuven, Belgium
Spin qubits represent a promising quantum-computing platform due to their combination of long coherence times and compatibility with established, industry-supported semiconductor fabrication techniques. Enrichment with 28Si isotopes can increase the coherence time of the qubit by reducing the amount of naturally occurring 29Si which has a non-zero nuclear spin. Hence, we are investigating this effect by comparing enriched to non-enriched samples fabricated using industry-level processes. The devices consist of two quantum dots and one single-electron transistor (SET) which is used for charge sensing, thereby detecting electron tunnel events in the quantum dots. By adjusting the gate voltages, the system can be tuned to its ground-state charge configuration, allowing individual electrons to be loaded into each quantum dot. After this initialization, two individual qubits are defined and can be coherently driven. Their performance is concluded by carrying out standard benchmark protocols, including T1 relaxation measurements or Ramsey and Hahn-echo sequences for T2 determination.
Keywords: Quantum Dot; Spin qubit; Industrially fabricated; Quantum Information; Si/SiGe