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

Yuan Zhou,Dong-Yan Lü,Guang-Hui Wang,Yan-Hua Fu,Ming-Yao He,Hong-Tao Ren

Figure 3. (Color online) Time-dependent quantum correlations of the MW photon and NV spin. The parameters are set as λ = − 0.7g, r = 2, κ1 ∼ γ ∼ 0.01g, and ${\kappa }_{\mathrm{eff}}^{S}\sim 200g$, where the black solid line means the joint variance $V({\hat{X}}_{a},{\hat{\sigma }}_{x})$, the red dashed line means the VNE $S(\hat{\varrho })$, and the blue short dashed line means the quantum correlation $C({\hat{X}}_{a},{\hat{\sigma }}_{x})$.