Modern imaging technologies are widely based on classical principles of light or
electromagnetic wave propagation. They can be remarkably sophisticated, with recent …

Two processes of photon-pair creation can be arranged such that the paths of the emitted
photons are identical. The path information is thereby not erased but rather never born in the …

Entanglement is a quintessential quantum mechanical phenomenon with no classical
equivalent. First discussed by Einstein, Podolsky, and Rosen and formally introduced by …

Imaging with undetected photons relies upon nonlinear interferometry to extract the spatial
image from an infrared probe beam and reveal it in the interference pattern of an easier-to …

Imaging based on the induced coherence effect makes use of photon pairs to obtain
information of an object without detecting the light that probes it. While one photon …

Quantum illumination has been proposed and demonstrated to improve the signal-to-noise
ratio (SNR) in light detection and ranging (LiDAR). When relying on coincidence detection …

Edge enhanced imaging via the spiral phase contrast enables to reveal the phase or
amplitude gradients of a target, which has been proved useful in feature recognition …

Holography exploits the interference of a light field reflected/transmitted from an object with a
reference beam to obtain a reconstruction of the spatial shape of the object. Classical …

Polarization entanglement holds significant importance for photonic quantum technologies.
Recently emerging subwavelength nonlinear quantum light sources, eg, GaP and LiNbO 3 …

Numerous molecules exhibit unique absorption bands in the “fingerprint” infrared (IR)
region, allowing chemical identification and detection. This makes IR spectroscopy an …