The phase sensitivity Δϕ as a function of the internal transmissivity rates T₁ with |α| = 3, and θ_α = π/2. The black solid and blue dot-dashed lines represent the results of Eqs. (13) and (15) for |α| = 2 and g = 2, respectively. The red dotted line: the result of Ref. [19] with a coherent state and a squeezed-vacuum state as inputs for |α| = 1.28436, r = 1.2, and g = 2. The orange dashed line: the result of Ref. [20] with two coherent states as inputs with |α| = |β| = 1.40144 and g = 2. Here the total average photon number inside the interferometer for the four schemes is the same and is N_T = 120.422.