The realization of spin-based logical gates crucially depends on magnetically-coupled spin qubits. Thus, understanding decoherence when spin qubits are in close proximity will become a roadblock to overcome. Herein, we provide a general first-principles model that straightforwardly evaluates the spin bath effect on the qubit phase memory time Tm . The method is applied to a ground-spin J=8 magnetic molecule 1 displaying atomic clock transitions, which remarkably increase Tm at unusually high spin concentrations. Besides reproducing experimental Tm values calculated by recent models in simple spin-1/2 systems, our approach unveils the causes that limit the coherence reached at the clock transitions in more challenging systems such as 1, where these previous models fail.
@article{arxiv.1807.10270,
title = {Unveiling the limits in the coherence of spin qubits against magnetic noise},
author = {L. Escalera-Moreno and A. Gaita-Ariño and E. Coronado},
journal= {arXiv preprint arXiv:1807.10270},
year = {2019}
}