Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 43: Color Centers III
Q 43.7: Talk
Thursday, March 14, 2024, 12:30–12:45, Aula
Optimization of nuclear spin control with germanium vacancy centre in diamond at mK temperatures — •Nick Grimm, Katharina Senkalla, Philipp Vetter, and Fedor Jelezko — Institute for Quantum Optics, Ulm University
Long-distance quantum communication requires a platform which allows to collect, store and process quantum information. Promising candidates for such quantum nodes are the negatively charged group-IV defects in diamond as they provide an efficient spin-photon interface with high photon flux, long coherence times and high-fidelity single qubit gates. Moreover, addressing of proximal nuclear spins can be used for computational purposes or act as memory qubits. Here we demonstrate for the first time the coherent control of a hybrid register of a negatively charged germanium vacancy centre (GeV) electron spin and a strongly coupled single 13C nuclear spin with excellent coherence properties at mK temperatures. We show initialisation and readout of the nuclear spin using a SWAP gate with the optically addressable GeV electron spin. Applying optimized microwave and radiofrequency pulses on the electron and nuclear spin, respectively, allows to reach increased fidelities. The realization of this fully controlled two-qubit register is laying the groundwork for the implementation of quantum repeaters.
Keywords: group-IV defect; color center; diamond; nuclear spin; coherence