Berlin 2024 – scientific programme
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QI: Fachverband Quanteninformation
QI 32: Quantum Sensing and Metrology
QI 32.12: Talk
Friday, March 22, 2024, 12:45–13:00, HFT-FT 131
Measuring nuclear spin qubits by qudit-based spectroscopy in Silicon Carbide — •Erik Hesselmeier1, Pierre Kuna1, Istvan Takacs2, Viktor Ivady2,4, Wolfgang Knolle3, Nguyen Tien Son4, Misagh Ghezellou4, Jawad Ul-Hassan4, Durga Dasari1, Florian Kaiser5, Vadim Vorobyov1, and Jörg Wrachtrup1 — 13rd Institute of Physics, University of Stuttgart, Stuttgart, Germany — 2Eötvös Loránd , Egyetem tér 1University-3, H-1053 Budapest, Hungary — 3Department of Sensoric Surfaces and Functional Interfaces, Leibniz-Institute of Surface Engineering (IOM), Leipzig, Germany — 4Department of Physics, Chemistry and Biology, Linköping University, Linköping, Sweden — 5Materials Research and Technology (MRT) Department, LIST, 4422 Belvaux, Luxembourg
Nuclear spins with hyperfine coupling to single electron spins are highly valuable quantum bits. In this work [1] we probe and characterise the particularly rich nuclear spin environment around single silicon vacancy color-centers (V2) in 4H-SiC. By using the electron spin-3/2 qudit as a 4 level sensor, we identify several sets of 29Si and 13C nuclear spins through their hyperfine interaction. We extract the major components of their hyperfine coupling via optical detected nuclear resonance, and assign them to shells in the crystal via the DFT simulations. We utilise the ground state level anti-crossing of the electron spin for dynamic nuclear polarization and achieve a nuclear spin polarization of up to 98(6)%. We show that this scheme can be used to detect the nuclear magnetic resonance signal of individual spins and demonstrate their coherent control. [1] Preprint Arxiv: 2310.15557
Keywords: Silicon Carbide; Nuclear Spin; Coherent Control