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Q: Fachverband Quantenoptik und Photonik

Q 80: Quantum Technologies – Color Centers III

Q 80.2: Vortrag

Freitag, 6. März 2026, 14:45–15:00, P 5

Electron spin-1/2 mediated nuclear-spin entanglement in diamond — •Marco Klotz, Andreas Tangemann, David Opferkuch, and Alexander Kubanek — Institute for Quantum Optics, University Ulm, Germany

Quantum networks will rely on photons entangled to robust, local quantum registers for computation and error correction. We demonstrate control of and entanglement in a fully connected three-qubit 13C nuclear spin register in diamond. The register is coupled to a quasi-free electron spin-1/2 of a silicon-vacancy center (SiV). High strain leads to a ground-state splitting of 1.8 THz and decouples the SiVs electron spin from spin-orbit interaction reducing the susceptibility to phonons at 4 Kelvin. We leverage continuously decoupled microwave and direct radio frequency driving to implement a nuclear-spin conditional phase-gate on the electron spin to mediate bipartite entanglement. This approach presents an alternative to dynamically decoupled nuclear spin entanglement, not limited by the electron spin's 1/2 nature, opening up new avenues to an optically-accessible, solid-state quantum register. [1] M. Klotz et al., https://arxiv.org/pdf/2508.05255, (2025) [2] M. Klotz et al., npj Quantum Inf. 11, 91 (2025)

Keywords: Silicon-vacancy center in diamond; Single-shot readout; Nuclear-spin entanglement