Quantum state readout is a key requirement for a successful qubit platform. In this work we demonstrate a high fidelity quantum state readout of a V2 center nuclear spin based on a repetitive readout technique. We demonstrate up to 99.5% readout fidelity and 99% for state preparation. Using this efficient readout we initialise the nuclear spin by measurement and demonstrate its Rabi and Ramsey nutation. Finally, we use the nuclear spin as a long lived memory for quantum sensing application of weakly coupled diatomic nuclear spin bath.
@article{arxiv.2401.04465,
title = {High fidelity optical readout of a nuclear spin qubit in Silicon Carbide},
author = {Erik Hesselmeier and Oliver von Berg and Pierre Kuna and Wolfgang Knolle and Florian Kaiser and Nguyen Tien Son and Misagh Ghezellou and Jawad Ul-Hassan and Vadim Vorobyov and Jörg Wrachtrup},
journal= {arXiv preprint arXiv:2401.04465},
year = {2024}
}