Phase estimation of phase shifts in two arms for an SU(1,1) interferometer with coherent and squeezed vacuum states
Gong Qian-Kun1, Li Dong1, Yuan Chun-Hua1, 4, †, Qu Ze-Yu1, 3, Zhang Wei-Ping2, 4
       

(color online) Different phase delay ways of the interferometer. (a) Phase shift in the single arm is divided into single upper arm and single lower arm due to the fact that the intensities of the two arms are not equal. (b) Phase shifts in the two arms.