Experimental results of the interference patterns of the MZ interferometer. The interference patterns (noise traces) of the MZ interferometer for two input squeezed states are given in (a) with the input relative phases θ = 0°, (b) 30°, (c) 60°, (d) 90°. Panel (e) is noise trace for two input vacuum state. Panel (f) is the variances of quantum states. Blue line corresponds to panel (a), green line to panel (b), pink line to panel (c), red line to panel (d), and dark line to panel (e).