Speaker
Description
Nuclear spin state manipulation is of particular interest for quantum control due to the comparably large coherence times in this degree of freedom. While spin manipulation and detection via magnetic resonance is a standard procedure for large ensembles, the selective addressing of a single nuclear spin, located at a specific position, is highly problematic from the perspective of classical nuclear magnetic resonance.
In this talk, two alternative, light-based pathways are presented, which have been proposed by us recently. The first method employs the nuclear electric quadrupole moment of aspherical nuclei as a handle to access nuclear spin states through time-dependent electric fields. [1,2,3] The second method identifies the vibrational excitation of pseudorotational motions in suitable, highly symmetric molecules as a possible way to generate localized magnetic fields, [4,5] and is closely related to the phenomenon of phonon-mediated dynamical multiferroicity, [6,7] where a time-dependent polarization is linked to magnetization in bulk materials.
Both methods have in common, that they aim for a link between highly developed and well established technologies, such as microelectronics and quantum optics, and nuclear spin systems. On the long run, by introducing pulsed lasers in the optical or IR regime as a tool for spin control, the long coherence times of the nuclear spin degrees of freedom might become accessible via known and proven technology standards.
1 J. K. Krondorfer and A. W. Hauser. Nuclear electric resonance for spatially resolved spin control via pulsed optical excitation in the UV-visible spectrum. Phys. Rev. A, 108:053110, 2023.
2 J. K. Krondorfer, M. Diez, and A. W. Hauser. Optical Nuclear Electric Resonance in LiNa: Selective Addressing of Nuclear Spins through Pulsed Lasers. Physica Scripta, 99:075307, 2024.
3 J. K. Krondorfer, S. Pucher, M. Diez, S. Blatt and A. W. Hauser. Optical nuclear electric resonance as single qubit gate for trapped neutral atoms. J. Phys. B: At. Mol. Opt. Phys. 58:235001, 2025.
4 R. Wilhelmer, M. Diez, J. K. Krondorfer, and A. W. Hauser. Molecular Pseudorotation in Phthalocyanines as a Tool for Magnetic Field Control at the Nanoscale. Journal of the American Chemical Society, 146(21):14620–14632, 2024.
5 M. Diez, J. K. Krondorfer, A. Hirtenfelder and A. W. Hauser. Magnetic coupling between nuclear motion and nuclear spins in molecules. Molecular Physics, e2600464, 2025.
6 D. M. Juraschek, M. Fechner, A. V. Balatsky, and N. A. Spaldin. Dynamical multiferroicity. Phys. Rev. Materials, 1:014401, Jun 2017.
7 D. M. Juraschek and N. A. Spaldin. Orbital magnetic moments of phonons. Phys. Rev. Materials, 3:064405, Jun 2019.