Figure 2
Log plot of phase variance for various detection schemes for a coherent state and squeezed vacuum into an MZI, as a function of the unknown phase difference Ï• . Loss parameters have been set to \(L=20\%\). Input state parameters for each respective state are set to \(|\alpha|^{2}=500\) and \(r=1\). SNL and QCRB are also plotted with the same loss parameters. Note that a homodyne measurement nearly, but not exactly, reaches the QCRB as shown by the inset.