  We analyze the impact of electric field and magnetic field fluctuations in
the decoherence of the electronic spin associated with a single
nitrogen-vacancy (NV) defect in diamond by engineering spin eigenstates
protected either against magnetic noise or against electric noise. The
competition between these noise sources is analyzed quantitatively by changing
their relative strength through modifications of the environment. This study
provides significant insights into the decoherence of the NV electronic spin,
which is valuable for quantum metrology and sensing applications.

Mesoscale and Nanoscale Physics