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Information × Registration Number 0222U003297, 0120U104878 , R & D reports Title Nonclassical and hybrid correlations of quantum systems under realistic conditions popup.stage_title Head Semenov Andrii О., Доктор фізико-математичних наук Registration Date 24-02-2022 Organization М.М.Bogolyubov Institute of Theoretical Physics of the National Academy of Sciences of Ukraine popup.description2  Object of research – non-niversal quantum computers, Josephson photomultipliers, quantum light in the turbulent atmosphere. Objectives – obtaining the probability distribution of photocounting for schemes of Gaussian and Fock boson sampling in the case of using superconducting nanowire single-photon detectors; obtaining the photodetection formula for the method of continuous-wave detection with Josephson photomultipliers; time-coherence theory for atmospheric quantum channels. Methods – photodetection theory; applying the positive operator-valued measure to description of realistic photodetection; quantum phase space; the method of photon density function; the phase¬screen method. Results: Probability distribution of photon numbers for schemes of Gaussian and Fock boson sampling is obtained for the case of using superconducting nanowire single-photon detectors. We have found a general expression describing photocounting statistics for arbitrary detectors. Joint and local photocounting distributions have been obtained for nonlocal Gaussian boson sampling with two-mode squeezed vacuum states. Two-time probability distributions of transmittance for free-space channels are obtained. Based on this, we have built probability distributions of transmittance for time sub-channels of free-space channels. Product Description popup.authors Yeremenko Ivan S. Baskov Roman A. Kovtonyuk Vadym S. Semenov Andrii Oleksandrovych Sokolov Andrii M. Uzunova Vira Oleksandrivna Yurin Mykyta D. popup.nrat_date 2022-03-09 Close