Infrared spectroscopy assisted by entangled photonsстатья
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Аннотация:We describe a proof-of-concept of a method for measurement of both real (refraction) and imaginary (absorption) part of
the refractive index in the infrared (IR) range by measuring an interference pattern in the visible range without the need
for any spectral and spatial selection. The concept is based on nonlinear interference of entangled photons, generated via
Spontaneous Parametric Down Conversion (SPDC). In our interferometer, the phase of the signal photon in the visible
range depends on the phase of an entangled IR photon. When the IR photon is traveling through the media of interest, its
properties can be found from the observations of the visible photon.