Spin-mechanical hybrid systems have been widely used in quantum information processing. However, the spin-mechanical interaction is generally weak, making it a critical challenge to enhance the spin-mechanical interaction into the strong coupling or even ultra-strong coupling regime. Here, we propose a protocol that can significantly enhance the spin-mechanical coupling strength with a diamond spin vacancy and a levitated micromagnet. A driving electrical current is used to modulate the mechanical motion of the levitated micromagnet, which induces a two-phonon drive and can exponentially enhance the spin-phonon and phonon-medicated spin-spin coupling strengths. Furthermore, a high fidelity Schrodinger cat state and an unconventional 2-qubit geometric phase gate with high fidelity and faster gate speed can be achieved using this hybrid system. This protocol provides a promising platform for quantum information processing with NV spins coupled to levitated micromagnets.
@article{arxiv.2210.04751,
title = {Enhanced spin-mechanical interaction with levitated micromagnets},
author = {Xue-Feng Pan and Xin-Lei Hei and Xing-Liang Dong and Jia-Qiang Chen and Cai-Peng Shen and Hamad Ali and Peng-Bo Li},
journal= {arXiv preprint arXiv:2210.04751},
year = {2023}
}