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Figure 1 | EPJ Quantum Technology

Figure 1

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

Figure 1

A general Mach-Zehnder interferometer with coherent \(\pmb{|\alpha\rangle}\) and squeezed vacuum \(\pmb{|\chi\rangle}\) states as input. Beam splitters (BS) mix the two spatial modes, while mirrors (M) impart a phase shift, which can be safely neglected since it is common to both modes. A phase shift ϕ represents the phase difference between the two arms of the MZI, which can be due to a path length difference. Our goal is to estimate the unknown parameter ϕ, which corresponds to the interaction of the quantum state with some process of interest.

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