This paper presents an algorithm for processing the transmission spectra of whisperinggallery optical microcavities for use as a nanoparticle detector. The algorithm is based on the broadening of the microcavity resonance curve during precipitation of nanoparticles on the microcavity surface. Experimental results on the detection of particles are compared with Langmuir adsorption theory. The contribution of the instability of the excitation radiation source due to the temperature drift of the resonant frequency to the measurement error is estimated.
This paper presents the results of experimental studies on quantum key distribution in optical fiber using superconducting detectors. Key generation was obtained on an experimental setup based on a self-compensation optical circuit with an optical fiber length of 101.1 km. It was first shown that photon polarization encoding can be used for quantum key distribution in optical fiber over a distance in excess of 300 km.
The article deals with a problem of halftone image signals recognition using the minimum of the informative divergent criterion. The new algorithm of direct search among set of alternatives using Kullback-Leibler information distance has been developed in opposition to exhaustive search between concurrent hypotheses. The experimental results have been produced. The proposed algorithm is characterized by increased accuracy and assurance factor in the problem of automatic image recognition.