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This study demonstrates a significant breakthrough where entangled photons enable scanless infrared spectroscopy with 21.8× higher signal-to-noise ratios, effectively bypassing classical detection limits in mid-infrared analysis. By reconstructing spectra from near-IR measurements without optical delay scanning, the technique accelerates hyperspectral imaging for applications ranging from medical tissue mapping to microplastic detection.

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Entangled Photons Boost Infrared Spectroscopy Signals by 21.8×

Quantum ZeitgeistJuly 22, 20266 min read

A new scanless quantum Fourier-transform infrared (sQFTIR) technique uses entangled photons to boost signals, achieving a 21.8× improvement over conventional methods.

Researchers at the Research Center for Non-Destructive Testing and Johannes Kepler University have demonstrated a new approach to infrared spectroscopy that achieves a signal-to-noise ratio improvement of 26.8 dB (a factor of 21.8) compared to classical methods. The team’s sQFTIR technique reconstructs mid-infrared spectra (3000 cm-1 to 2380 cm-1) from measurements taken in the near-IR range (approximately 780 nm to 820 nm), eliminating the need for direct mid-IR measurements. This advancement removes the traditional requirement for optical delay scanning, utilizing instead a static, low-gain nonlinear interferometer and a reconstruction algorithm. The work, licensed July 20, 2026, demonstrates rapid hyperspectral imaging with a spatial resolution of 12.3 µm…

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