Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 66: Poster – Quantum Technologies III
Q 66.30: Poster
Thursday, March 5, 2026, 17:00–19:00, Philo 2. OG
Nuclear-nuclear Bell-state preparation of 13C nuclear spins coupled to a negatively charged silicon vacancy (SiV−) center. — •David Opferkuch1,2, Marco Klotz1, Andreas Tangemann1, and Alexander Kubanek1,2 — 1Institute for Quantum Optics, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany — 2Center for Integrated Quantum Science and Technology (IQST), Ulm University, Albert-Einstein-Allee 11, Ulm 89081, Germany
Due to presumed high scalability, spin qubits in solid state hosts are promising candidates for the realization of quantum networks. As such, negatively charged silicon-based vacancy centers (SiV−) in nanodiamonds (ND) combine the good spin properties of diamond as a host with the good optical properties of group-IV defects.
We are using highly strained SiV− in ND, which demonstrate orbital ground state splittings exceeding 1THz. Thus, phonon induced dephasing of the spin qubit is mitigated at liquid Helium temperatures.
We have demonstrated coherent control of up to three 13C nuclear spins coupling to a single SiV−. Here we present nuclear-nuclear spin entangling in the three qubit register. A Bell-state between two nuclear spins is created using a 2π-gate. We thus demonstrate reliable nuclear-nuclear spin entanglement for use in a three-qubit quantum memory architecture.
[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; Spin Qubit; Nuclear Spin Register; Entanglement; Bell-State