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QI: Fachverband Quanteninformation
QI 28: Spin Qubits
QI 28.5: Vortrag
Donnerstag, 9. März 2023, 12:15–12:30, F428
Controlling nuclear spin qubits in silicon carbide — •Pierre Kuna1, Erik Hesselmeier1, Di Liu1, Vadim Vorobyov1, Florian Kaiser2, and Jörg Wrachtrup1 — 13. Physikalisches Institut, Universität Stuttgart — 2LIST, Luxembourg
The V2 color center in silicon carbide (SiC) emerged as promising CMOS compatible optically interfaced spin systems in solid state materials. V2 centers combine excellent spin and optical properties, i.e., ms spin coherence times and transform limited optical linewidth, even after nanophotonic integration[1]. Additionally, the di-atomic lattice of SiC provides an elegant pathway to further expand on existing quantum computing approaches demonstrated in the diamond counterpart.
Here, we present theoretical considerations and experimental results towards high-fidelity nuclear spin control in SiC. Using the V2 center as the control (electron) spin, and the surrounding nuclear spins as computational qubits, our first goal is to implement single shot readout (SSR). With this enabling technique, we plan to implement quantum computational algorithms on multiple nuclear spins.
We strive to demonstrate significantly increased fidelities and coherence times based the half-integer control spin, which results in a frozen core that prevents nuclear spin flip-flops. Additionally, the different gyromagnetic ratios of 29-silicon and 13-carbon nuclear spins should allow us to dynamically couple and decouple nuclear spins using an external magnetic field, which can increase the complexity of attainable quantum computing circuits.
[1] C. Babin et al., Nat. Mater. 21, 67 (2022)