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Optical correlator for secure access in buildings

One of the most frequently used applications of optical correlators in the latest years refers to encryption and authentication systems. In this paper, we review various techniques and methods to enhance the performance of the recently proposed correlators to make the possibility of thefts and counterfeits less and less likely. We also perform the simulation of such a device, certifying the results obtained through experimental measurements and confirming the excellent performance of this type of optical correlator.