Figure 5
Log plot of phase variance of the various detection schemes, with introduction of thermal photon noise into both interferometer arms, of total average photon number of \(\pmb{n_{\mathrm {th}}=1}\) . Strength of the two input sources are set to \(|\alpha |^{2}=500\), \(r=1\). Note that homodyne loses most of its previous advantage over intensity difference but remains the superior measurement choice.