Phase-sensitive optical parametric amplification of squeezed states helps to overcome detection loss and noise thus increase the robustness sub-shot-noise sensing. Because such techniques, e.g., imaging spectroscopy, operate with multimode light, is required. Here we find optimal methods for phase-sensitive verify them in an experiment where a pumped second-order nonlinear crystal seeded Gaussi...

The optical parametric amplifier (OPA) has attractive features for communications, such as a wideband, high gain, and fast transient response. In addition, by using idler light, which is phase-conjugated light generated in the amplification process, various kinds of signal processing, fiber-nonlinearity mitigation, wavelength conversion, phase-sensitive amplification, can be performed. A period...