Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 12: Quantum Communication II
Q 12.7: Vortrag
Montag, 11. März 2024, 18:30–18:45, HS 3118
Coherent control of the Tin-Vacancy center with superconducting waveguides at mK temperatures — •Ioannis Karapatzakis1, Jeremias Resch1, Marcel Schrodin1, Luis Kussi1, Philipp Fuchs2, Michael Kieschnick3, Jan Meijer3, Christoph Becher2, David Hunger1, and Wolfgang Wernsdorfer1 — 1Karlsruher Institut für Technologie, DE — 2Universität des Saarlandes, DE — 3Universität Leipzig, DE
Robust quantum networks require an interface between photons and long-lived spin degrees of freedom. Due to its strong spin-orbit splitting, the Tin-Vacancy center possesses long electron spin lifetimes around 1K. For high fidelity control, the use of microwave fields is required. However, the magnetic transitions are heavily suppressed in unstrained emitters. This limitation can be overcome by inducing strain and precisely aligning the DC magnetic field orientation. Recent work has shown the manipulation of the electron spin using aluminum wire bonds [1] and on-chip gold waveguides [2]. Both methods suffer from Ohmic losses in the microwave line, restricting coherence through heat induction. To overcome this challenge, we fabricate a superconducting coplanar waveguide made from Niobium on a diamond membrane through all-optical lithography. We induce strain in the diamond by using a polymer with a high coefficient of thermal expansion for fixation. We demonstrate coherent manipulation of the electron spin and evaluate the decoherence properties for different magnetic field orientations at mK temperature. [1] Rosenthal et al., Phys. Rev. X 13, 031022 (2023) [2] Guo et al., arXiv:2307.11916v2 (2023)
Keywords: Tin-Vacancy center; superconductivity; Group-IV; microwave control; diamond