Figure 3
From: Quantum phase estimation using path-symmetric entangled states
(a) Phase sensitivity 
achieved via parity measurement and (b) Phase sensitivity 1/F given by Fisher information F, under a loss channel (T: transmittance rate) as a function of an unknown phase ϕ, using NOON (blue dashed curve), AOOA (black dotted curve), SOOS (red long-dashed curve), and QOOQ (purple solid curve) states. The shot-noise limit (green dashed line) is given by 
. The average input photon number is set to be Nav = 2.
