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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 10: Diamond and Related Dielectric Materials I

KFM 10.4: Talk

Tuesday, March 19, 2024, 11:00–11:20, E 124

Fabrication steps for realization of quantum tokens — •Miriam Mendoza Delgado¹, Jan Thieme², Johann Peter Reithmaier¹, Kilian Singer², and Cyril Popov¹ — ¹Institute of Nanostructure Technologies and Analytics (INA), University of Kassel, Germany — ²Institute of Physics, University of Kassel, Germany

Nitrogen-vacancy (NV) color centers in diamond have acquired great relevance in quantum technology, since they represent an “atom-like” solid state system with optically accessible spin properties. NVs can be implemented as single photon sources with high optical stability and quantum yield, even at room temperature. Furthermore, the coherent electron spin of NV can be used as a long lived qubit which can be applied in quantum information technology, e.g. in quantum repeaters or tokens. In order to enhance the photon collection efficiency from NVs, they should be incorporated in photonic structures, like nanopillars. The aim of the current work is the fabrication of diamond nanopillars incorporated with NVs and integrated with microwave antennas and electrodes for the realization of quantum tokens. Arrays of monocrystalline diamond nanopillars with diameters between 150 nm and 250 nm, 1 µm height and center-to-center distance of 10 µm were defined by electron beam lithography and structured subsequent by inductively coupled plasma reactive ion etching with oxygen. Different techniques are studied for the creation of NVs, which affect both their density and properties.

Keywords: Nitrogen-vacancy (NV) color centers; quantum tokens