Dresden 2026 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 26: Poster II

HL 26.44: Poster

Mittwoch, 11. März 2026, 09:30–11:30, P1

Improving the optical readout of NV-centers in diamond by oxide surface coating — •Klemens Wurl, Michael Bar, Holger von Wenchstern, and Marius Grundmann — Universität Leipzig, Felix-Bloch Institute, Germany

Successful quantum computing has many advantages compared to regular computing, especially in simulations. It is proposed that nitrogen-vacancy (NV) centers in diamond could be used as qubits at room temperature, which would make everyday applications of quantum computing easier compared to solutions that rely on superconductivity.[1] The quantum states of the NV-centers can be controlled by optical excitation via laser and spin-state manipulation by microwave radiation.[2] The main objective of this research is to improve the optical readout of the NV-center by the use of solid immersion lenses (SIL). For this purpose, transition metal oxides are used, which are optically transparent and do not exhibit photoluminescence for the given wavelength. PLD is used for the surface coating, but the optical properties are limited by particle density. Therefore, peripheral target ablation was used to decrease the particle density as it allows for higher control of the plasma plume deflection. The influence of O₂ partial pressure and fluence will be investigated in order to record the corresponding growth window for decreased particle expulsion as well as increased optical transparency and refractive index.

[1] S.Pezzagna et al., Appl. Phys. Rev. 8(1), 011308, (2021).

[2] F. Jelezko et al., Phys. Stat. Sol.(a) , 203(13), 3207-3225, (2006).

Keywords: quantum computing; NV-center; solid immersion lenses; transition metal oxids; optical properties