  We present a novel scheme for the generation of entangled states of two
spatially separated nitrogen-vacancy (NV) centers with two
whispering-gallery-mode (WGM) microresonators, which are coupled either by an
optical fiber-taper waveguide, or by the evanescent fields of the WGM. We show
that, the steady state of the two NV centers can be steered into a singlet-like
state through a dissipative quantum dynamical process, where the cavity decay
plays a positive role and can help drive the system to the target state. The
protocol may open up promising perspectives for quantum communications and
computations with this solid-state cavity quantum electrodynamic system.

Quantum Physics