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Figure 4 | EPJ Quantum Technology

Figure 4

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

Figure 4

Log plots of phase variance ratio to the lossless QCRB as a function of number of measurements ( M ) under phase drift noise only. For all plots shown, \(|\alpha|^{2}=100\), \(r=1\) and the standard deviation of the chosen Gaussian distribution is fixed to \(\sigma=0.15\). Note that parity and intensity measurement remain noisy even after 200 averaged measurements, where homodyne and intensity difference approach their optimal phase variance quickly in M.

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