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Harnessing the quantum interference of photon-pair generation processes,infrared quantum absorption spectroscopy (IRQAS) can extract the infraredoptical properties of a sample through visible or near-infrared photondetection without the need for an infrared optical source or detector, whichhas been an obstacle for higher sensitivity and spectrometer miniaturization.However, experimental demonstrations have been limited to wavelengths shorterthan 5 um or in the terahertz region, and have not been realized in theso-called fingerprint region of 1500- 500 cm^-1 (6.6 to 20 um), which iscommonly used to identify chemical compounds or molecules. Here we report theexperimental demonstration of quantum Fourier transform infrared (QFTIR)spectroscopy in the fingerprint region, by which both absorption and phasespectra (complex spectra) can be obtained from Fourier transformed quantuminterferograms obtained with a single pixel visible-light detector. Asdemonstrations, we obtained the transmittance spectrum of a silicon wafer ataround 10 um (1000 cm^-1) and complex transmittance spectrum of a syntheticfluoropolymer sheet, polytetrafluoroethylene, in the wavelength range of 8 to10.5 um (1250 to 950 cm^-1), where absorption due to symmetric and asymmetricstretching modes of C-F bonds is clearly observed. The signal-to-noise ratioper unit spectral width and unit probe light intensity of our QFTIRspectroscopy method outperforms conventional FTIR spectroscopy by a factor of10^2. These results open the way for new forms of spectroscopic devices basedon quantum technologies.

Quantum Fourier-transform infrared spectroscopy in the fingerprint region