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Nitrogen-vacancy (NV) defect centers in diamond are strong candidates togenerate entangled states in solid-state environments even at room temperature.Quantum correlations in spatially separated NV systems, for distances betweenNVs ranging from a few nanometers to a few kilometers, have been recentlyreported. In the present work we consider the entanglement transfer from two-mode microwave squeezed (entangled) photons, which are in resonance with thetwo lowest NV electron spin states, to initially unentangled NV centers. Wefirst demonstrate that the entanglement transfer process from quantummicrowaves to isolated NV electron spins is feasible. We then proceed to extendthe previous results to more realistic scenarios where 13 C nuclear spin bathssurrounding each NV are included, quantifying the entanglement transferefficiency and robustness under the effects of dephasing/dissipation noisynuclear baths. Finally, we address the issue of assessing the possibility ofentanglement transfer from the squeezed microwave light to two remote nuclearspins closely linked to different NV centers.

Cross-entangling electronic and nuclear spins of distant nitrogen-vacancy centers in noisy environments by means of quantum microwave radiation