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THU: Thursday Contributed Sessions
THU 13: Poster Session: Applications
THU 13.62: Poster
Thursday, September 11, 2025, 16:30–18:30, ZHG Foyer 1. OG
Towards Efficient Spin Control of Tin-Vacancy Color Centers in Diamond for Quantum Networks — •Jonas Wollenberg1, Keisuke Oshimi1, Charlotta Gurr1, Alok Gokhale1, Cem Güney Torun1, Mohamed Belhassen1, Natalia Kemf2, Matthias Matalla2, Ralph-Stefan Unger2, Ina Ostermay2, Alexander Külberg2, Andreas Thies2, Tommaso Pregnolato1,2, Gregor Pieplow1, and Tim Schröder1,2 — 1Department of Physics, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany — 2Ferdinand-Braun-Institut (FBH), Gustav-Kirchhoff-Str. 4, 12489 Berlin, Germany
Tin-vacancy (SnV) color centers in diamond are a promising platform for realizing quantum information networks. Crucial to their performance as photonic quantum memories are gate fidelities that can be realized with the spin qubits embedded in their electronic structure. Direct microwave driving of the spin transitions can be used to achieve fidelities over 99%. This requires external magnetic DC fields as well as sufficient crystal strain which imposes additional constraints. However, a recent model has shown that there should exist optimal orientations of the magnetic AC and DC field independent of the strain environment. In this work, we investigate experimentally how the alignment of the magnetic AC and DC field can enable efficient spin control in low strain environments. For this, we optically address single SnVs confined in nanostructures using a confocal fluorescence microscope. Using a vector magnet and a variable MW antenna design, we realize different AC and DC field configurations.
Keywords: Quantum network; Quantum memory; Tin-vacancy center; Color centers in diamond; Quantum control