Abstract

Quantum spectroscopy is a powerful tool that is based on classically detecting one of the photons of a biphoton state to study how the other photon experiences the environment [1]. It is especially useful, since the signal photon can be read out in the visible range, where the detection is simple and affordable, while the idler photon can probe the optical properties in mid-infrared (MIR) and far-infrared (FIR) ranges, which typically requires expensive and bulky solutions when using conventional spectroscopic approaches. Quantum spectroscopy has been utilized to measure broadband refractive index dispersion [2] and domain structure [3] of solids in a single shot of a non-tunable continuous-wave laser, as well as to precisely determine the optical properties of gases [4].

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