Figure 1: Schematic diagram and interference fringes for two types of interferometers. | Nature Communications

Figure 1: Schematic diagram and interference fringes for two types of interferometers.

From: Quantum metrology with parametric amplifier-based photon correlation interferometers

Figure 1

(a) An SU(1,1) NCI; (b) a conventional MZ interferometer. PA, parametric amplifier; G,g, amplitude gains of PAs; φ, overall phase shift; δ, small phase change; I0, average input intensity; Ips, the intensity that senses the phase change; HD, homodyne detection. (c) The interference fringes at the outputs of the NCI (blue) and the CI (red) with the same phase-sensing intensity ==60 μW. The fringe enhancement of NCI to CI is BS=5.5=7.4 dB.

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