We present a tutorial on the phenomenon of induced coherence without induced emission,
and specifically its application to imaging and metrology. It is based on a striking effect …

Quantum metrology is one of the most promising applications of quantum technologies. The
aim of this research field is the estimation of unknown parameters exploiting quantum …

In an unseeded SU (1, 1) interferometer composed of two cascaded degenerate parametric
amplifiers, with direct detection at the output, we demonstrate a phase sensitivity overcoming …

Nonlinear interferometers are a ubiquitous tool in quantum photonics. As such, they allow
spooky‐like imaging with undetected light. On the one side their working principle is based …

An SU (1, 1) interferometer uses a sequence of two optical parametric amplifiers for
achieving sub-shot-noise sensitivity to a phase shift introduced in between. We present the …

Nonlinear interferometers are promising tools for quantum metrology, as they are
characterized by an improved phase sensitivity scaling compared to linear interferometers …

A nonlinear phase shift is introduced to a Mach-Zehnder interferometer (MZI), and we
present a scheme for enhancing the phase sensitivity. In our scheme, one input port of a …

Reversed nonlinear dynamics is predicted to be capable of enhancing the quantum sensing
in unprecedented ways. Here, we report the experimental demonstration of a loss-tolerant …

The sensitivity of classical Raman spectroscopy methods, such as coherent anti-stokes
Raman spectroscopy (CARS) or stimulated Raman spectroscopy (SRS), is ultimately limited …

Sensing with undetected photons enables the measurement of absorption and phase shifts
at wavelengths different from those detected. Here, we experimentally map the balance and …