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Information × Registration Number 0224U033010, (0124U003999) , R & D reports Title Quantum correlations of electromagnetic radiation popup.stage_title Базові засади теорії квантових кореляцій та її застосування Head Lev Bohdan I., д.ф.-м.н. Registration Date 14-12-2024 Organization М.М.Bogolyubov Institute of Theoretical Physics of the National Academy of Sciences of Ukraine popup.description1 The Project objective is the systematic study of quantum correlations of electromagnetic radiation emerging in different physical systems. We expect to achieve the following specific goals: (1) Develop new methods for testing nonclassicality and nonlocality; (2) Develop the algebraic approach to describing quantum correlations; (3) Elaborate novel schemes for the generation of nonclassical states of microwave photons; (4) Improve the accuracy of parameter estimation problems in random media. popup.description2  The project aims at systematic study of quantum correlations of electromagnetic radiation emerging in various physical systems. During the implementation of Stage I, the following new scientific results were obtained. The dependence of the spatial coherence radius of electromagnetic radiation on the parameters of an optical system with turbulent atmosphere and a telescope with circular aperture was analytically calculated. A methodology for estimating the parameters of such a system through direct detection and Hermite-Gaussian decomposition was developed – a method for analyzing the spatial structure of the light field by decomposing it into Hermite-Gaussian modes, which are solutions of the paraxial wave equation. The quantum and classical Fisher information matrices were calculated for these detection methods, confirming the advantages of the Hermite-Gaussian decomposition method for achieving the quantum limit of accuracy. Methods for precise measurement of small angular distances between thermal light sources were studied and mathematical models were developed taking into account photodetector imperfections. The use of Clifford algebra for describing the physical properties of the early Universe was demonstrated and a new mechanism of spontaneous symmetry breaking with different degrees of freedom and the origin of baryon asymmetry was proposed. Realization of two-photon interaction between a microwave resonator mode and a superconducting qubit was proposed, leading to coherent conversion of two photons into the excited state of the qubit and vice versa. The application of this coupling for frequency conversion and creation of a detector that absorbs photons in pairs was considered. A criterion for the possibility of classical simulation of photodetection in optical systems using threshold detectors was developed, taking into account the intensity of radiation and detection efficiency. Product Description popup.authors Yeremenko Ivan S. Hrebeniuk Artem I. Dmytruk Mykhailo A. Klen Mykyta D. Kliushnichenko Oleksandr V. Kovtoniuk Vadym S. Lev Bohdan I. Stoliarov Yevhen V. popup.nrat_date 2024-12-14 Close