Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 29: Poster – Quantum Technologies I
Q 29.12: Poster
Tuesday, March 3, 2026, 17:00–19:00, Philo 2. OG
Towards a multi-qubit register based on the GeV color center in diamond for a quantum repeater node — •Simon Gregor Walliser, Katharina Senkalla, and Fedor Jelezko — Institute for Quantum Optics, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
The realization of quantum networks will enable secure end-to-end communication and offers a path to overcoming current limitations of quantum devices in terms of scalability.
In a quantum network, quantum repeaters are used to distribute quantum information over long distances. Quantum repeaters based on color centers in diamond are a promising candidate for quantum network nodes.
Group-IV color centers, such as the germanium-vacancy (GeV) center, exhibit long coherence times at millikelvin temperatures and a high Debye-Waller factor.
Additionally, the use of dynamical decoupling (DD) on the electron spin of the GeV center enables coherent control of surrounding 13C nuclear spins.
In more complex quantum-repeater protocols, a higher number of coherently controllable spins is necessary.
In this work, we present our progress on the detection and coherent control of a weakly coupled 13C nuclear spin in the presence of a strongly coupled 13C nuclear spin by using the XY8 and other DD sequences.
Keywords: Group-IV color centers; diamond; Quantum repeaters; coupled nuclear spin; Dynamical decoupling