Regensburg 2022 – wissenschaftliches Programm

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QI: Fachverband Quanteninformation

QI 4: Poster: Quantum Information

QI 4.17: Poster

Montag, 5. September 2022, 18:00–20:00, P2

Designing a microwave antenna for spectroscopy of nitrogen vacancy centers in a fiber-based cavity — •Matthias Klausmann, Maximilian Pallmann, Jeremias Resch, and David Hunger — Karlsruher Institut für Technologie

Overcoming losses in long distance fiber-based quantum networks is one of the big challenges in the field of quantum communication, which requires the development of a quantum repeater. Color centers in diamond are a promising platform for realizing the needed spin-photon interfaces due to the possibility of optical readout and initialization. The optical readout of coherent photons can be enhanced by integrating the diamond in a cavity by exploiting the Purcell-effect. In addition, the coherent control of the electron spin of the color center and nearby nuclear spins is necessary for such a device.

In our experiment, we look for different designs of microwave antennas to manipulate the electron spin of nitrogen vacancy centers in a fiber-based Fabry-Pérot micro-cavity with regard that this can also be used under cryogenic conditions. Testing the antenna designs is performed in a room-temperature confocal microscope setup. We observe large ensembles of shallow implanted nitrogen-vacancy centers but also single centers at a depth of a few micrometers below the diamond surface. With our antennas we are able to perform pulsed optically detected magnetic resonance, Rabi and Echo measurements. Using this measurement protocols, the hyperfine interaction between the electron spin and the nuclear spin of the hosting nitrogen atom as well as the interaction with a nearby 13C nuclear spin can be resolved.