Improvement on the manipulation of a single nitrogen-vacancy spin and microwave photon at single-quantum level

It remains a great challenge to realize direct manipulation of a nitrogen-vacancy(NV)spin at the single-quantum level with a microwave(MW)cavity.As an alternative,a hybrid system with the spin–phonon–photon triple interactions mediated by a squeezed cantilever-type harmonic resonator is proposed.According to the general mechanical parametric amplification of this in-between phonon mode,the direct spin–phonon and photon–phonon couplings are both exponentially enhanced,which can even further improve the coherent manipulation of a single NV spin and MW photon with a higher efficiency.In view of this triple system with enhanced couplings and the additional sideband adjustable designs,this scheme may provide a more efficient phonon-mediated platform to bridge or manipulate the MW quantum and a single electron spin coherently.It is also hoped to evoke wider applications in the areas of quantum state transfer and preparation,ultrasensitive detection and quantum nondestructive measurement,etc.