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Figure 5 | EPJ Quantum Technology

Figure 5

From: Nearly optimal measurement schemes in a noisy Mach-Zehnder interferometer with coherent and squeezed vacuum

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.

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