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Q: Fachverband Quantenoptik und Photonik

Q 68: Quantum Technologies (Color Centers and Ion Traps) II (joint session Q/QI)

Q 68.3: Talk

Friday, March 14, 2025, 11:45–12:00, HS Botanik

Integration of group IV color centers in nanodiamonds in a tunable Fabry-Perot microcavity — •Selene Sachero, Robert Berghaus, Florian Feuchtmayr, and Alexander Kubanek — Institute for Quantum Optics, Ulm University, 89081 Ulm, Germany

Quantum repeater are essential building block to create a large scale quantum communication network. An ideal quantum repeater nodes efficiently link a quantum memory with photons serving as flying qubits. By coupling group IV vacancy defect centers in nanodiamonds (NDs) to an open Fabry-Perot cavity, such an interface can be created. As such a platform, we propose a fully tunable cavity composed by two Bragg mirrors which allows short cavity lengths down to ≈1 /mum, and provides efficient coupling of the quantum emitter at liquid helium temperatures.

Here, we show the good optical properties of a single group IV emitter and its transfer, via nanomanipulation, to a Fabry-Perot cavity. The coupling of the emitter into the resonator is achieved maintaining an high finesse.

Moreover, we perform PL measurement at cryogenic temperatures and observe a lifetime reduction due to the Purcell factor.

Keywords: Group IV defects; Nanodiamonds; Fabry Perot microcavity