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arXiv 2023年

作者： Pakravan, Saeid Chouinard, Jean-Yves Li, Xingwang Zeng, Ming Hao, Wanming Pham, Quoc-Viet Dobre, Octavia A. The Department of Electric and Computer Engineering Laval University Quebec CityQCG1V 0A6 Canada The School of Physics and Electronic Information Engineering Henan Polytechnic University Jiaozuo China The School of Information Engineering Zhengzhou University Zhengzhou450001 China The School of Computer Science and Statistics Trinity College Dublin Dublin Ireland The Faculty of Engineering and Applied Science Memorial University St. John’s Canada

Non-orthogonal multiple access (NOMA) has been viewed as a potential candidate for the upcoming generation of wireless communication systems. Comparing to traditional orthogonal multiple access (OMA), multiplexing users in the same time-frequency resource block can increase the number of served users and improve the efficiency of the systems in terms of spectral efficiency. Nevertheless, from a security viewpoint, when multiple users are utilizing the same time-frequency resource, there may be concerns regarding keeping information confidential. In this context, physical layer security (PLS) has been introduced as a supplement of protection to conventional encryption techniques by making use of the random nature of wireless transmission media for ensuring communication secrecy. The recent years have seen significant interests in PLS being applied to NOMA networks. Numerous scenarios have been investigated to assess the security of NOMA systems, including when active and passive eavesdroppers are present, as well as when these systems are combined with relay and reconfigurable intelligent surfaces (RIS). Additionally, the security of the ambient backscatter (AmB)-NOMA systems are other issues that have lately drawn a lot of attention. In this paper, a thorough analysis of the PLS-assisted NOMA systems research state-of-the-art is presented. In this regard, we begin by outlining the foundations of NOMA and PLS, respectively. Following that, we discuss the PLS performances for NOMA systems in four categories depending on the type of the eavesdropper, the existence of relay, RIS, and AmB systems in different conditions. Finally, a thorough explanation of the most recent PLS-assisted NOMA systems is given. © 2023, CC0.

关键词： Efficiency

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Non-Destructive Liquid-Mixture Sensor Using Dual-Mushroom Resonator for Glucose Concentration Characterization

Non-Destructive Liquid-Mixture Sensor Using Dual-Mushroom Re...

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2021 Research, Invention, and Innovation Congress: Innovation Electricals and Electronics, RI2C 2021

作者： Chudpooti, Sukanya Sangpet, Patchadaporn Pechrkool, Tanaporn Chalermwisutkul, Suramate Akkaraekthalin, Prayoot King Mongkut's University of Technology North Bangkok Facutly of Appied Science Department of Industrial Physics and Medical Instrumentation Bangkok Thailand King Mongkut's University of Technology North Bangkok Faculty of Engineering Department of Electrical and Computer Engineering Bangkok Thailand Bangkok Thailand

ISBN: (纸本)9781665403009

This paper presents the non-destructive liquid-mixture sensor for glucose concentration characterization using the dual-mushroom resonator technique. The resonator is designed by using Jerusalem patch for reducing the size of a resonator, operating at 5.76 GHz with a total size of 10 × 30 mm2 (0.2λ0 × 0.2λ0). In the experimental measurement setup, the Teflon tube channel is placed on the top of the resonator patch. The liquid under test is filled into the Teflon tube using the syringe. The volume of the liquid under test is 100 μl. The liquid under test is a controlled temperature of 25 degrees Celcius. Six solutions, e.g., DI-water, 0.04 g/mL, 0.08 g/mL, 0.12 g/mL, 0.16 g/mL and 0.20 g/mL of D-glucose in DI-water, are selected for calibrating the proposed sensor. From the measurement results, the proposed sensor can classify the difference between D-glucose in the DI-water in each of 0.04 g/mL. The sensitivity of D-glucose solution in terms of reflection coefficient, S11, is 18.74 dB/g/mL. The extracted equation shows the regression coefficient better than 0.995 based on the 2nd order polynomial curve fitting technique. The non-destructive microwave liquid-mixture of D-glucose and DI-water offers advantage points, e.g., low-cost, long lifetime, no-additional chemical process, etc. © 2021 IEEE.

关键词： Resonators

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Universality of random matrix dynamics ∗

arXiv

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arXiv 2020年

作者： Burda, Zdzislaw AGH University of Science and Technology Faculty of Physics and Applied Computer Science al. Mickiewicza 30 Kraków30-059 Poland

We discuss the concept of width-to-spacing ratio which plays the central role in the description of local spectral statistics of evolution operators in multiplicative and additive stochastic processes for random matrices. We show that the local spectral properties are highly universal and depend on a single parameter being the width-to-spacing ratio. We discuss duality between the kernel for Dysonian Brownian motion and the kernel for the Lyapunov matrix for the product of Ginibre matrices. Copyright © 2020, The Authors. All rights reserved.

关键词： Stochastic systems

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Post-Error Correction for Quantum Annealing Processor using Reinforcement Learning

arXiv

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arXiv 2022年

作者： Śmierzchalski, Tomasz Pawela, Lukasz Puchala, Zbigniew Trzcinski, Tomasz Gardas, Bartlomiej Warsaw University of Technology Pl. Politechniki 1 Warsaw00-661 Poland Institute of Theoretical and Applied Informatics Polish Academy of Sciences Baltycka 5 Gliwice44-100 Poland Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Kraków30-348 Poland

Finding the ground state of the Ising spin-glass is an important and challenging problem (NP-hard, in fact) in condensed matter physics. However, its applications spread far beyond physic due to its deep relation to various combinatorial optimization problems, such as travelling salesman or protein folding. Sophisticated and promising new methods for solving Ising instances rely on quantum resources. In particular, quantum annealing is a quantum computation paradigm, that is especially well suited for Quadratic Unconstrained Binary Optimization (QUBO). Nevertheless, commercially available quantum annealers (i.e., D-Wave) are prone to various errors, and their ability to find low energetic states (corresponding to solutions of superior quality) is limited. This naturally calls for a post-processing procedure to correct errors (capable of lowering the energy found by the annealer). As a proof-of-concept, this work combines the recent ideas revolving around the DIRAC architecture with the Chimera topology and applies them in a real-world setting as an error-correcting scheme for quantum annealers. Our preliminary results show how to correct states output by quantum annealers using reinforcement learning. Such an approach exhibits excellent scalability, as it can be trained on small instances and deployed for large ones. However, its performance on the chimera graph is still inferior to a typical algorithm one could incorporate in this context, e.g., simulated annealing. © 2022, CC BY.

关键词： Quantum theory

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Comment on 'Phase transition in a network model of social balance with Glauber dynamics'

arXiv

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arXiv 2020年

作者： Malarz, Krzysztof Kulakowski, Krzysztof AGH University of Science and Technology Faculty of Physics and Applied Computer Science al. Mickiewicza 30 Kraków30-059 Poland

In a recent work [R. Shojaei et al, Physical Review E 100, 022303 (2019)] the Authors calculate numerically the critical temperature Tcof the balanced-imbalanced phase transition in a fully connected graph. According to their findings, Tcdecreases with the number of nodes N. Here we calculate the same critical temperature using the heat-bath algorithm. We show that Tcincreases with N as N γ, with γclose to 0.5 or 1.0. This value depends on the initial fraction of positive bonds. Copyright © 2020, The Authors. All rights reserved.

关键词： Temperature

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Dynamics of irregular wave fields in the Schamel equation framework

arXiv

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arXiv 2024年

作者： Flamarion, Marcelo V. Pelinovsky, Efim Didenkulova, Ekaterina Departamento Ciencias—Sección Matemáticas Pontificia Universidad Católica del Perú Av. Universitaria 1801 Lima San Miguel15088 Peru Faculty of Informatics Mathematics and Computer Science HSE University Nizhny Novgorod603155 Russia Gaponov-Grekhov Institute of Applied Physics Nizhny Novgorod603122 Russia

The present article is devoted to the study of the dynamics of narrowband wave fields within the nonintegrable Schamel equation, which plays an important role in plasma physics, wave dynamics in metamaterials, and electrical circuits. A Monte Carlo approach is used to obtain a large number of random independent realizations of the wave fields, allowing for an investigation of the evolution of the following statistical characteristics: spectra, moments, and distribution functions. The simulations are conducted for different values of the Ursell number (the ratio of nonlinearity to dispersion) to study the impact of nonlinearity and dispersion on the processes under consideration. Copyright © 2024, The Authors. All rights reserved.

关键词： Dispersion (waves)

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Local-photon model of the momentum of light

arXiv

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arXiv 2024年

作者： Waite, Gabriel Hodgson, Daniel Lang, Ben Alapatt, Varghese Beige, Almut The School of Physics and Astronomy University of Leeds LeedsLS2 9JT United Kingdom Centre for Quantum Computation and Communication Technology Australia Centre for Quantum Software and Information School of Computer Science Faculty of Engineering and Information Technology University of Technology SydneyNSW2007 Australia The School of Physics and Astronomy University of Nottingham NottinghamNG7 2RD United Kingdom Universitat de València Paterna Spain

Recently we introduced a local photon approach for modelling the quantised electromagnetic field in position space. Using this approach, we define the momentum of light in this paper as in quantum mechanics as the generator for spatial translation. Afterwards, we analyse the momentum dynamics of photonic wave packets which transition from air into a denser dielectric medium. Our analysis shines new light onto the Abraham-Minkowski controversy which highlights the intricacies involved in the characterisation of the momentum of the electromagnetic field. Although our results align with Minkowski’s theory and with the definition of the canonical momentum of light in quantum electrodynamics, there are also some crucial differences. © 2024, CC BY.

关键词： Momentum

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Soliton dynamics in random fields: The Benjamin-Ono equation framework

arXiv

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arXiv 2024年

作者： Flamarion, Marcelo V. Pelinovsky, Efim Didenkulova, Ekaterina Departamento Ciencias-Sección Matemáticas Pontificia Universidad Católica del Perú Av. Universitaria 1801 Lima San Miguel15088 Peru Faculty of Informatics Mathematics and Computer Science HSE University Nizhny Novgorod603155 Russia Gaponov-Grekhov Institute of Applied Physics Nizhny Novgorod603122 Russia

Algebraic soliton interactions with a periodic or quasi-periodic random force are investigated using the Benjamin-Ono equation. The random force is modeled as a Fourier series with a finite number of modes and random phases uniformly distributed, while its frequency spectrum has a Gaussian shape centered at a peak frequency. The expected value of the averaged soliton wave field is computed asymptotically and compared with numerical results, showing strong agreement. We identify parameter regimes where the averaged soliton field splits into two steady pulses and a regime where the soliton field splits into two solitons traveling in opposite directions. In the latter case, the averaged soliton speeds are variable. In both scenarios, the soliton field is damped by the external force. Additionally, we identify a regime where the averaged soliton exhibits the following behavior: it splits into two distinct solitons and then recombines to form a single soliton. This motion is periodic over time. Copyright © 2024, The Authors. All rights reserved.

关键词： Solitons

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Fast evaluation of interaction integrals for confined systems with machine learning

arXiv

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arXiv 2020年

作者： Mreńca-Kolasińska, Alina Kolasiński, Krzysztof Szafran, Bartlomiej AGH University of Science and Technology Faculty of Physics and Applied Computer Science al. Mickiewicza 30 Kraków30-059 Poland

The calculation of interaction integrals is a bottleneck for the treatment of many-body quantum systems due to its high numerical cost. We conduct configuration interaction calculations of the few-electron states confined in III-V semiconductor two-dimensional structures using a shallow neural network to calculate the two-electron integrals, which can be used for general isotropic interaction potentials. This approach allows for a speed-up of the evaluation of the energy levels and controllable accuracy. Copyright © 2020, The Authors. All rights reserved.

关键词： Quantum optics

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Versatile tape-drive target for high-repetition-rate laser-driven proton acceleration

引用

High Power Laser science and Engineering 2023年第4期11卷 59-69页

作者： N.Xu M.J.V.Streeter O.C.Ettlinger H.Ahmed S.Astbury M.Borghesi N.Bourgeois C.B.Curry S.J.D.Dann N.P.Dover T.Dzelzainis V.Istokskaia M.Gauthier L.Giuffrida G.D.Glenn S.H.Glenzer R.J.Gray J.S.Green G.S.Hicks C.Hyland M.King B.Loughran D.Margarone O.McCusker P.McKenna C.Parisuaña P.Parsons C.Spindloe D.R.Symes F.Treffert C.A.J.Palmer Z.Najmudin John Adams Institute for Accelerator Science Blackett LaboratoryImperial College LondonLondonUK School of Maths and Physics Queen’s University BelfastBelfastUK Central Laser Facility STFC Rutherford Appleton LaboratoryDidcotUK SLAC National Accelerator Laboratory Menlo ParkUSA ELI Beamlines Centre Institute of PhysicsCASDolni BrezanyCzech Republic Faculty of Nuclear Sciences and Physical Engineering Czech Technical University in PraguePragueCzech Republic Department of Physics SUPAUniversity of StrathclydeGlasgowUK Department of Mechanical Engineering Stanford UniversityStanfordUSA Department of Applied Physics Stanford UniversityStanfordUSA Department of Electrical and Computer Engineering University of AlbertaEdmontonCanada Institut für Kernphysik Technische Universität DarmstadtDarmstadtGermany

We present the development and characterization of a high-stability,multi-material,multi-thickness tape-drive target for laser-driven acceleration at repetition rates of up to 100 *** tape surface position was measured to be stable on the sub-micrometre scale,compatible with the high-numerical aperture focusing geometries required to achieve relativistic intensity interactions with the pulse energy available in current multi-Hz and near-future higher repetition-rate lasers(>kHz).Long-term drift was characterized at 100 Hz demonstrating suitability for operation over extended *** target was continuously operated at up to 5 Hz in a recent experiment for 70,000 shots without intervention by the experimental team,with the exception of tape replacement,producing the largest data-set of relativistically intense laser–solid foil measurements to *** tape drive provides robust targetry for the generation and study of high-repetitionrate ion beams using next-generation high-power laser systems,also enabling wider applications of laser-driven proton sources.

关键词： high-repetition-rate laser target laser-plasma acceleration proton generation tape-drive target

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