Figure 4

Inferred Fisher information.

Fisher information (solid blue line) calculated from the fit in Fig. 3 for the single-fringe output of our 6-photon Holland-Burnett state. The light blue shading represents one standard deviation of uncertainty, derived from uncertainty in the fit parameters. All uncertainties were derived using standard uncertainty propogation techniques. The solid red curve is the optimal theoretical single-fringe Fisher information for a |33〉 measurement on the 6-photon HB state. The dashed horizontal line is the SNL, the dotted curve is for a NOON state single fringe with ideal visbility and the dot-dash curve is for a single-fringe NOON state with visibility equivalent to our experimental data.