Macroscopic Pure State of Light Free of Polarization Noise

The preparation of completely non-polarized light is seemingly easy: an everyday example is sunlight. The task is much more difficult if light has to be in a pure quantum state, as required by most quantum-technology applications. The pure quantum states of light obtained so far are either polarized or, in rare cases, manifest hidden polarization: even if their intensities are invariant to polarization transformations, higher-order moments are not. We experimentally demonstrate the preparation of the macroscopic singlet Bell state, which is pure, completely non-polarized, and has no polarization noise. Simultaneous fluctuation suppression in three Stokes observables below the shot-noise limit is demonstrated, opening perspectives for noiseless polarization measurements. The state is shown to be invariant to polarization transformations. This robust highly entangled isotropic state promises to fuel important applications in photonic quantum technologies.Comment: 4 pages, 2 figures, 1 tabl

Multi-photon nonclassical correlations in entangled squeezed vacuum states

Photon-number correlation measurements are performed on bright squeezed vacuum states using a standard Bell-test setup, and quantum correlations are observed for conjugate polarization-frequency modes. We further test the entanglement witnesses for these states and demonstrate the violation of the separability criteria, which infers that all the macroscopic Bell states, containing typically $10^6$ photons per pulse, are polarization entangled. The study also reveals the symmetry of macroscopic Bell states with respect to local polarization transformations.Comment: 5 pages, 4 figure

Polarisation-optical model of a controlled random number generator

The subject of the paper is an original model of a tunable optical random number generator. The purpose of the article is to analyse the possibilities of using the proposed model to ensure the protection of the control signals in the projected telecommunication management system of the robotized agro-industrial complex of the Republic of South Ossetia.The research was carried out by methods of mathematical and information-logical modeling. The main results of the study are the information-logical model of the hardware implementation prototype, the descriptive mathematical model of its functioning and the obtained dependences of the quantitative characteristics of the generated random numbers statistical distributions on the main control parameter of the experimental setup.These results can be used in the design and the operation of the remote production facilities monitoring and management telecommunication systems’ components. The possibilities of prototype creating and functioning were demonstrated by visualising the schematic chart of the experimental equipment and by the quantitative estimates of “one” and “zero” signals observation probabilities under the different polarisation rotator orientations relative to the plane of the optical signals detecting system

Increasing the Efficiency of the NPP Turbine Feed Pump by Improving Hydraulic Characteristics

В работе представлен начальный этап проекта, направленного на повышение эффективности действующего оборудования АЭС путём точного определения проблемных зон и устранения их недостатков. Повышение эффективности осуществляется на основе вывода рекомендаций нейросетевой модели, работающей в реальном времени.The paper presents the initial stage of the project aimed at improving the efficiency of existing NPP equipment by accurately identifying problem areas and eliminating their shortcomings. Efficiency improvement is carried out based on the output of recommendations of a neural network model operating in real time.Работа подготовлена в рамках выполнения НИОКР по до говору № 9/326176-Д от 29.10.2021 с АО «Концерн Россэнергоатом».The work was written in the framework of R&D under contract No. 9/326176-D dated October 29, 2021with JSC «Concern Rossenergoatom»

Generation of bright squeezed vacuum in the Karassiov states

We suggest an experimental procedure allowing one to prepare squeezed vacuum in a special type of generalized Bell states, first introduced by V.P. Karassiov. We present the first results on the experimental generation of such states and observation of their polarization properties

The representativeness of the statistical data frame in the quantitative image analysis

In the article the concept of representativeness of the statistical data frame is discussed. Also the statistical measure of representativeness and a method for the quantitative assessment of the degree of representativeness of the general population are proposed. To demonstrate the techniques and methods of application, we consider a case of identifying the amount of statistically reliable sampling in the analysis of polymer composite surface’s SEM-images