  The investigation on significantly enhancing the coupling to NV centers at
single-quanta level is of great key point to further explore its application in
quantum information processing (QIP). We here study a joint scheme to further
enhance NV-phonon coherent coupling with two methods working together in a
hybrid optomechanical systems. Both methods are mechanic-induced mode field
coupling (MFC) leading to the modification of the spatial distribution of the
optical field, and the mechanical parametric amplification (MPA) realized by
modulating the mechanical spring constant in time, respectively. With the joint
assistance of MFC and MPA, the coherent coupling between the NV spin and one
supermode of the mechanical resonators (MRs) can be further enhanced
significantly, with the rate ne^r, several potential applications on this
proposal are also discussed in this work. For the ultimate target of enhancing
the coupling to NV spin at single-quanta level, this attempt may provide a
promising spin-phonon platform for implementing the more active control.
