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QI: Fachverband Quanteninformation

QI 14: Quantum Information Poster Session

QI 14.10: Poster

Mittwoch, 11. März 2026, 18:00–21:00, P4

Entanglement of Electron and Nuclear Spins in Diamond — •Magnus J. R. Platena, Marius M. Straßner, Tim C. Duka, and Martin S. Brandt — Walter Schottky Institut, TU München, Am Coulombwall 4, 85748 Garching

Entanglement is one of the most surprising and counterintuitive phenomena of quantum physics. Nitrogen-vacancy (NV) centers in diamond provide a platform for studying this phenomenon at room temperature, a unique advantage of this solid-state system. The goal of this work is to demonstrate and quantify the entanglement of electron spins and ¹⁵N nuclear spins in ensembles of NV centers via optically detected magnetic resonance. In a first step, we characterize isotopically engineered diamonds as a function of ¹⁵N concentration, electron irradiation, and annealing and reproduce the published dependence of T₂ and T₂^* on nitrogen concentration. With the help of electron nuclear double resonance, we entangle the two spins and quantify the entanglement via quantum state tomography and application of the Peres criterion.

Keywords: NV center; Entanglement; Diamond; Nitrogen-vacancy