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HL: Fachverband Halbleiterphysik

HL 33: Poster II

HL 33.29: Poster

Wednesday, March 29, 2023, 17:00–19:00, P1

Design of a microwave resonator for coherent nuclear spin control of ¹³C and ²⁹Si isotopes near V₂ color centers in 4H-SiC at cryogenic temperatures — •Jan Philipp Ahnfeldt¹, Fedor Hrunski¹, Shravan Kumar Parthasarathy^1,2, Maximilian Hollendonner¹, Daniel Scheller¹, Andre Pointner¹, and Roland Nagy¹ — ¹Chair of Electron Devices, FAU Erlangen-Nürnberg, Erlangen, Germany — ²Fraunhofer Institute for Integrated Systems and Device Technology (IISB), Erlangen, Germany

One step to meaningful quantum technologies is to scale up the currently developed ones. This can be done by parallelizing several quantum systems through a quantum network. Therefore it is crucial that the network contains quantum memory nodes in which the quantum system used has a long coherence time. This can be ensured by the nuclear spin of the ¹³C or ²⁹Si isotopes surrounding a silicon vacancy in 4H-SiC. However, due to the low gyromagnetic ratio of a nuclear spin a large magnetic flux is needed for the spin control. Accordingly, a large RF power with a frequency in the upper kHz domain is required. Because the power dissipation causes problems when upscaling these systems, it is important to improve the spin control’s efficiency. Hence, a resonator creating a standing magnetic wave polarized perpendicular to the quantization axis of the vacancy seems to be a promising approach. Since it must operate at room and cryogenic temperatures, the resonator must be mechanically stable and needs a wide bandwidth. Therefore, several resonators are investigated which could meet these requirements in a small package of a few cubic centimeters.