Electric-field control of spin-qubits in quantum paraelectrics

Manipulating electron spins by applying electric instead of magnetic fields is faster, more energy efficient and spatially confined, making the investigation one of the most active research fields in solid-state physics and materials science. We propose a unique approach to this topic by exploiting the unique dielectric properties of quantum paraelectrics KTaO3 and SrTiO3 doped with S-state paramagnetic ions. Due to high lattice polarizability (permittivity up to 25000), a significant (up to two orders of magnitude) amplification of coupling of electron spins with electric field is anticipated for these ions. Particular attention will be given to electric dipole centers, where a strong interplay between spins and electric dipoles is expected. Using advanced magnetic resonance techniques at frequencies up to 1 THz, we also intend to shed light on the promising applications of these materials in quantum information processing, as a media for hosting spin-qubits that can be substantially more energy efficiently and coherently controlled by electric fields.