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Q: Fachverband Quantenoptik und Photonik
Q 62: Poster – Quantum Information Technologies (joint session Q/QI)
Q 62.20: Poster
Donnerstag, 13. März 2025, 17:00–19:00, Tent
Optimal control solutions for nuclear spin polarization of nitrogen-vacancy (NV) centers in diamond — •René Wolters1, Matthias Müller1, Felix Motzoi1, and Tommaso Calarco1,2 — 1Forschungszentrum Jülich GmbH, Jülich, Germany — 2Institute for Theoretical Physics, University of Cologne, Germany
The topic of nuclear spin polarization in colour center platforms, including NV centers in a diamond lattice or silicon carbide, has attracted considerable interest in recent years. This is due to the favourable conditions for quantum sensory devices and the storage of quantum states that are enabled by the long coherence time of the nuclear spins and their operability at room temperature. The defining characteristic of colour centers is that the electronic spin state of the center can be both initialized and read out via laser irradiation in the visible wavelength spectrum. Dynamical nuclear polarization (DNP) techniques are employed with the objective of transferring the spin polarization from the electronic to the surrounding nuclear spins. We employ quantum optimal control to optimize DNP pulses in terms of both time and error resilience, with regard to the polarization of single or few well-defined nuclear spins in a weak magnetic field which can be addressed and controlled individually. The weak magnetic field permits longer coherence times and simpler implementation with fewer errors. Furthermore, we investigate how to polarize the nuclear spins with the minimal possible number of initializations of the electron spin, to reduce disruption of the laser irradiation.
Keywords: Quantum optimal control; NV Center; Dynamical nuclear polarization