112,307 research outputs found
Multiphoton communication in lossy channels with photon-number entangled states
No full textWe address binary and quaternary communication channels based on correlated multiphoton two-mode states of radiation in the presence of losses. The protocol are based on photon number correlations and realized upon choosing a shared set of thresholds to convert the outcome of a joint photon number measurement into a symbol from a discrete alphabet. In particular, we focus on channels built using feasible photon-number entangled states (PNES) as two-mode coherently-correlated (TMC) or twin-beam (TWB) states and compare their performances with that of channels built using feasible classically correlated (separable) states. We found that PNES provide larger channel capacity in the presence of loss, and that TWB-based channels may transmit a larger amount of information than TMC-based ones at fixed energy and overall loss. Optimized bit discrimination thresholds, as well as the corresponding maximized mutual information, are explicitly evaluated as a function of the beam intensity and the loss parameter. The propagation of TMC and TWB in lossy channels is analyzed and the joint photon number distribution is evaluated, showing that the beam statistics, either sub-Poissonian for TMC or super-Poissonian for TWB, is not altered by losses. Although entanglement is not strictly needed to establish the channels, which are based on photon-number correlations owned also by separable mixed states, purity of the support state is relevant to increase security. The joint requirement of correlation and purity individuates PNES as a suitable choice to build effective channels. The effects of losses on channel security are briefly discussed
Quantum communication with photon-number entangled states and realistic photodetection
No full textWe address the effects of realistic photodetection, with nonunit quantum efficiency and background noise (dark counts), on the performances of quantum communication schemes based on photon-number entangled states (PNES). We consider channels based on Gaussian twin-beam states (TWB) and non-Gaussian two-mode coherent states (TMC) and evaluate the channel capacity by optimizing the bit discrimination threshold. We found that TWB-based channels are more robust against noise than TMC-based ones and that this result is almost independent on the statistics of dark counts
Bit threshold optimization for multiphoton communication in lossy channels
No full textWe address M-ary communication channels based on entangled two-mode states of radiation in the presence of losses. In particular we focus on channels build by two-mode coherently-correlated (TMC) or twin-beam (TWB) states. Optimized bit discrimination thresholds, as well as the corresponding maximized mutual information, are explicitly evaluated as a function of beam intensities and loss parameters for binary and quaternary alphabets. The evolution of the two entangled support states in lossy channels is analyzed and the joint photon number distribution is evaluated, showing that the beam statistics (either sub-Poissonian for TMC or super-Poissonian for TWB) is not altered by channel losses. The effects of losses on the channel security is discussed
Hormonal regulation of prooxidant-antioxidant homeostasis in gilts.
No full textStoyanovskyy, V., Usenko, S., Shostya, A., Kuzmenko, L., Slynko, V., & Tenditnyk, V. (2020). Hormonal regulation of prooxidant-antioxidant homeostasis in gilts. Ukrainian Journal of Veterinary and Agricultural Sciences, 3(3), 39-43
Hormonal regulation of prooxidant-antioxidant homeostasis in gilts.
No full textStoyanovskyy, V., Usenko, S., Shostya, A., Kuzmenko, L., Slynko, V., & Tenditnyk, V. (2020). Hormonal regulation of prooxidant-antioxidant homeostasis in gilts. Ukrainian Journal of Veterinary and Agricultural Sciences, 3(3), 39-43
author-bios-SRD-19-0063.R1 – Supplemental material for The Network Structure of Police Misconduct
No full textSupplemental material, author-bios-SRD-19-0063.R1 for The Network Structure of Police Misconduct by George Wood, Daria Roithmayr and Andrew V. Papachristos in Socius</p
Impact of turbulant environment on innovative projects
No full textVoitenko S.V. Impact of turbulant environment on innovative projects / S.V. Voitenko, I.M. Teslenok, K. Usenko // Тиждень науки-2023. Електротехнічний факультет. Тези доповідей науково-технічної конференції, Запоріжжя, 24-28 квітня 2023 р. / Редкол. : В. Шаломєєв (відпов. ред.) Електрон. дані. – Запоріжжя : НУ «Запорізька політехніка», 2023. – С. 317-318
Hypothesis about the cyclic lability of prooxidant-antioxidant homeostasis in sows
No full textUsenko S. A., Kovalenko V. F., Shostya A.M., Siabro A. S., PavlovaI.V., Sarnavska I.V. Hypothesis about the cyclic lability of prooxidant-antioxidant homeostasis in sows. The First ESDAR-ECAR Online Conference (11-16 October 2021), Balice, 2021.This study was conducted to determine the peculiarities of the formation of prooxidant-antioxidant homeostasis in cyclical and pregnancy gilts
Hypothesis about the cyclic lability of prooxidant-antioxidant homeostasis in sows
No full textUsenko S. A., Kovalenko V. F., Shostya A.M., Siabro A. S., PavlovaI.V., Sarnavska I.V. Hypothesis about the cyclic lability of prooxidant-antioxidant homeostasis in sows. The First ESDAR-ECAR Online Conference (11-16 October 2021), Balice, 2021.This study was conducted to determine the peculiarities of the formation of prooxidant-antioxidant homeostasis in cyclical and pregnancy gilts
Психотестування в дітей із підвищеним рівнем свинцю у крові: вплив спіруліни
No full textPsychological testing in children with elevated blood lead level: the effect of spirulina / N. I. Hnida, N. H. Lotysh, D. V. Usenko, І. M. Hnidoi, V. N. Kukushkin // Modern Pediatrics. Ukraine. - 2024. - 5 (141). - Р. 30-33 Режим доступу: doi: 10.15574/SP.2024.5(141 ).3O3
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