Optical nonlinear conversion processes are ubiquitously applied to scientific as well as
industrial tasks. In particular, nonlinear processes are employed to generate radiation in …

Interferometers are widely used as sensors in precision measurement. Compared with a
conventional Mach–Zehnder interferometer, the sensitivity of a correlation-enhanced …

Terahertz technology offers solutions in nondestructive testing and spectroscopy for many
scientific and industrial applications. While direct detection of photons in this frequency …

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

Frequency-angular distributions of optical signals generated via spontaneous parametric
downconversion with the Stokes idler frequency shifts 0.2–5 THz are studied simultaneously …

Statistical distributions of the analog readings of an antenna-coupled THz superconducting
bolometer were measured and analyzed under a special type of irradiation by low-energy …

An experimental scheme and data processing approaches are proposed for measuring by
analog photo detectors the normalized second-order correlation function of the biphoton …

Abstract Nonlinear SU (1, 1) interferometers are fruitful and promising tools for spectral
engineering and precise measurements with phase sensitivity below the classical bound …

The conditions for the generation and detection of quantum-correlated pairs of optical and
terahertz photons in the process of strongly frequency-nondegenerate parametric down …

The effect of the structure of angular modes of an optical–terahertz biphoton field appearing
in strongly nondegenerate parametric down-conversion on the possibility of measuring …