The Phase Sensitivities for Different Phase-Shift Configurations in an SU(1,1) Interferometer*

Fan Wang,Wei Zhong,Lan Zhou,Yu-Bo Sheng

Fig. 8 (Color online) Phase sensitivities (a) $\Delta\theta_{{UL}}^{{{A}}}$ and (b) $\Delta\theta_{{UL}}^{{{B}}}$ as a function of gain factor $s_{2}$ for various values of the detection efficiency $T_{2}$ in unbalanced SU(1,1) interferometer. The parameters of input state are as follows: $r=3$, $\alpha=\sinh r$. Note that $s_{1}=1$ and $T_{1}=0.9$.