10909126099?profile=RESIZE_584x A joint German government and industry project (QSPEC) is developing a new generation of analytical instruments with a sensitivity almost comparable to NMR, but at a much lower cost based on new laser sources which generate quantum frequency combs.

The research is developing instrumentation based on a method that uses entangled photons to measure the substance to be analysed at one wavelength, and detect the information obtained from it at another wavelength. The first step is to generate an entangled photon pair consisting of a long-wavelength and a short-wavelength photon. The long-wavelength photon now interacts with the sample, changing its phase, and then the manipulated photon pair is then fed into another process in which yet another photon pair is generated, giving rise to quantum interference and a spectrum based on the bandwidth of the photon pairs. The short-wavelength photons act as carriers of compositional information. The resulting spectra gives a fingerprint of the food, and its authenticty can be determined by comparing this spectra with those from a dataset of authentic samples.

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