Quantum 2025 – scientific programme
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MON: Monday Contributed Sessions
MON 2: Quantum Control
MON 2.8: Talk
Monday, September 8, 2025, 16:00–16:15, ZHG002
Coherent Control of a Carbon-13 nuclear spin proximal to a Tin-Vacancy Center in Diamond — •Jeremias Resch1, Ioannis Karapatzakis1, Philipp Fuchs2, Marcel Schrodin1, Michael Kieschnick3, Julia Heupel4, Mohamed Elshorbagy1, Luis Kussi1, Christoph Sürgers1, Cyril Popov4, Jan Meijer3, Christoph Becher2, Wolfgang Wernsdorfer1, and David Hunger1 — 1Karlsruher Institut für Technologie — 2Universität des Saarlands — 3Universität Leipzig — 4Universität Kassel
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 electron spin possesses long spin lifetimes and has been shown to be able to be coherently controlled with high fidelity. In order to store information longer than the communication time between two nodes, even more long-lived nuclear spin degrees need to be coherently addressed. For high fidelity control of both electron and nuclear spin, the use of microwave fields is required. Recent work has shown the manipulation using aluminum wire bonds and on-chip gold waveguides. 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. Using this, we demonstrate initialization of a single carbon-13 spin by optical pumping, perform high fidelity coherent manipulation, randomized benchmarking, and achieve a coherence time up to 1.3s.
Keywords: Tin-Vacancy center; Coherent control; Microwave driving; Diamond; Spin-photon interfaces