Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 12: Quantum Communication II
Q 12.6: Vortrag
Montag, 11. März 2024, 18:15–18:30, HS 3118
Microwave control of the Tin-Vacancy center using magnetic field alignment — •Jeremias Resch1, Ioannis Karapatzakis1, Marcel Schrodin1, Luis Kussi1, Philipp Fuchs2, Michael Kieschnick3, Jan Meijer3, Christoph Becher2, Wolfgang Wernsdorfer1, and David Hunger1 — 1Karlsruher Institut für Technologie, DE — 2Universität des Saarlandes, DE — 3Universität Leipzig, DE
Scalable quantum information processing requires spectrally stable interfaces between photons and solid-state qubits. Group-IV color centers exhibit an inversion symmetry protecting them from surface charge noise. By an optimized spectroscopy method, we identify hour-long charge-state and spectrally stable SnV centers with Fourier-limited optical linewidth using resonant excitation. To control the electron spin with high fidelity, the use of microwave fields is required. However, the magnetic transitions are heavily suppressed in unstrained emitters. This limitation can be circumvented by using naturally strained [1] or strain-engineered [2] SnV centers. Alternatively, a precise alignment of the DC magnetic field orientation allows for manipulation of the electron spin using microwave fields even at lower strain values. Hence, we implement a 3D vector magnet in a confocal microscope setup at mK temperatures. By aligning the DC magnetic field with respect to the SnV symmetry axis, we determine the angle dependent splitting of the electron spin ground and excited state and show the full fit to the SnV electron spin Hamiltonian. [1] Rosenthal et al., Phys. Rev. X 13, 031022 (2023) [2] Guo et al., arXiv:2307.11916v2 (2023)