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arXiv 2024年

作者： Soleymaninia, Maryam Hashamipour, Hadi Salajegheh, Maral Khanpour, Hamzeh Spiesberger, Hubert Meißner, Ulf G. P.O.Box 19395-5531 Tehran Iran Istituto Nazionale di Fisica Nucleare Gruppo collegato di Cosenza Arcavacata di Rende CosenzaI-87036 Italy Helmholtz-Institut für Strahlen-und Kernphysik Bethe Center for Theoretical Physics Universität Bonn BonnD-53115 Germany AGH University Faculty of Physics and Applied Computer Science Al. Mickiewicza 30 Kraków30-055 Poland Department of Physics University of Science and Technology of Mazandaran P.O.Box 48518-78195 Behshahr Iran PRISMA+ Cluster of Excellence Institut für Physik Johannes-Gutenberg-Universität Staudinger Weg 7 MainzD-55099 Germany Forschungszentrum Jülich JülichD-52425 Germany Tbilisi State University Tbilisi0186 Georgia

In this study, we revisit the extraction of parton-to-KS0 hadron fragmentation functions, named FF24-KS0, focusing on both next-to-leading-order and next-to-next-to-leading-order accuracy in perturbative QCD. Our approach involves the analysis of single inclusive electron-positron annihilation (SIA) data. The two key improvements are, on the one hand, the incorporation of the latest experimental data from the BESIII experiment and, on the other hand, the adoption of Neural Networks in the fitting procedure. To address experimental uncertainties, the Monte Carlo method is employed. Our investigation also explores the impact of hadron mass corrections on the description of SIA data, spanning a broad kinematic regime with a particular emphasis on the range of small z values. The theory prediction for KS0 production at both NLO and NNLO accuracy exhibits good agreement with experimental data within their respective uncertainties. Copyright © 2024, The Authors. All rights reserved.

关键词： Hadrons

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Exploring tidal force effects and shadow constraints for Schwarzschild-like black hole in Starobinsky–Bel-Robinson gravity

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European Physical Journal C 2023年第11期83卷 995页

作者： Arora, Dhruv Molla, Niyaz Uddin Chaudhary, Himanshu Debnath, Ujjal Atamurotov, Farruh Mustafa, G. Sagara Odisha Sambalpur768224 India Department of Mathematics Indian Institute of Engineering Science and Technology Howrah Shibpur711 103 India Department of Applied Mathematics Delhi Technological University Delhi110042 India Department of Mathematics Shyamlal College University of Delhi Delhi110032 India New Uzbekistan University Mustaqillik Ave. 54 Tashkent100007 Uzbekistan Central Asian University Milliy Bog’ Street 264 Tashkent111221 Uzbekistan Faculty of Computer Engineering Tashkent University of Applied Sciences Gavhar Str. 1 Tashkent100149 Uzbekistan Institute of Theoretical Physics National University of Uzbekistan Tashkent100174 Uzbekistan Department of Physics Zhejiang Normal University Jinhua321004 China Zhejiang Institute of Photoelectronics and Zhejiang Institute for Advanced Light Source Zhejiang Normal University Zhejiang Jinhua321004 China

The current manuscript deals with the tidal force effects, geodesic deviation, and shadow constraints of the Schwarzschild-like black hole theorised in Starobinsky–Bel-Robinson gravity exhibiting M-theory compactification. In the current analysis, we explore the radial and angular tidal force effects on a radially in-falling particle by the central black hole, which is located in this spacetime. We also numerically solve the geodesic deviation equation and study the variation of the geodesic separation vector with the radial coordinate for two nearby geodesics using suitable initial conditions. All the obtained results are tested for Sag A* and M87* by constraining the value of the stringy gravity parameter β using the shadow data from the event horizon telescope observations. All the results are compared with Schwarzschild black hole spacetime. In our study, we found that both the radial and angular tidal forces experienced by a particle switch their initial behaviour and turn compressive and stretching, respectively, before reaching the event horizon. The geodesic deviation shows an oscillating trend as well for the chosen initial condition. For the constrained value of β , we see that the spacetime geometry generated by Sag A* and M87* is effectively same for both Schwarzschild and Starobinsky–Bel-Robinson black hole. Furthermore, we also calculated the angular diameter of the shadow in Starobinsky–Bel-Robinson black hole and compared with the Schwarzschild black hole. It is observed that the angular diameter of shadow for M87* and Sgr A* in Starobinsky–Bel-Robinson black hole is smaller than the Schwarzschild black hole. The calculated results satisfy the event horizon telescope observational constraints. © 2023, The Author(s).

关键词： Black holes

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Publisher’s Note: “Modeling the performance and bandwidth of single-atom adiabatic quantum memories” [APL Quantum 1, 026107 (2024)]

APL Quantum

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APL Quantum 2024年第2期1卷

作者： Takla Nateeboon Chanaprom Cholsuk Tobias Vogl Sujin Suwanna Optical and Quantum Physics Laboratory Department of Physics Faculty of Science Mahidol University Bangkok 10400 Thailand Department of Computer Engineering TUM School of Computation Information and Technology Technical University of Munich 80333 Munich Germany Abbe Center of Photonics Institute of Applied Physics Friedrich Schiller University Jena 07745 Jena Germany

This article was originally published online on 29 April 2024 with an affiliation identifier missing for the second author and affiliations 2 and 3 out of order

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Modeling the performance and bandwidth of single-atom adiabatic quantum memories

APL Quantum

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APL Quantum 2024年第2期1卷

Quantum memories are essential for quantum repeaters, which will form the backbone of the future quantum internet. Such memory can capture a signal state for a controllable amount of time, after which this state can be retrieved. In this work, we theoretically investigated how atomic material and engineering parameters affect the performance and bandwidth of a quantum memory. We have applied a theoretical model for quantum memory operation based on the Lindblad master equation and adiabatic quantum state manipulation. The materials’ properties and their uncertainty are evaluated to determine the performance of Raman-type quantum memories by showcasing two defects in two-dimensional hexagonal boron nitride. We have derived a scheme to calculate the signal bandwidth based on the material parameters as well as the maximum efficiency that can be realized. The bandwidth depends on four factors: the signal photon frequency, the dipole transition moments in the electronic structure, the cavity volume, and the strength of the external control electric field. As our scheme is general and independent of materials, it can be applied to many other quantum materials with a suitable three-level structure. We, therefore, provided a promising route for designing and selecting materials for quantum memories. Our work is, therefore, an important step toward the realization of a large-scale quantum network.

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Superconducting dome with extended s-wave pairing symmetry in the heavily hole-overdoped copper-oxide planes

arXiv

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arXiv 2021年

作者： Zegrodnik, Michal Wójcik, P. Spalek, J. Academic Centre for Materials and Nanotechnology AGH University of Science and Technology Al. Mickiewicza 30 Krakow30-059 Poland AGH University of Science and Technology Faculty of Physics and Applied Computer science Al. Mickiewicza 30 Krakow30-059 Poland Institute of Theoretical Physics Jagiellonian University ul. Lojasiewicza 11 Krakow30-348 Poland

We analyze the two-orbital (with dx²−y² and d3z²−r² orbitals) analogue of the t-J-U model as applied to the description of the copper-oxide monolayer deposited on the Bi2Sr2CaCu2O8+δ substrate (CuO2/BSCCO). We show, that an extended s-wave superconducting dome appears in the heavily hole overdoped regime of the model, with dominant contribution to the pairing coming from the d3z²−r² orbitals. Also, the lower critical doping for the appearance of the SC state concurs with the Lifshitz Transition after which the hole-like Fermi pockets are created around the M points in the Brillouin zone. The obtained results are in accord with the recent experimental result [cf. Y. Zhong et al., Sci. Bull. 61, 1239 (2016)]. An analogous two-band description is also analyzed in the context of the Ba₂CuO₄−y bulk compound, where the heavily hole-overdoped situation is believed to be reached [cf. W. M. Li et al. PNAS 116, 12156 (2019)]. As we show, a two dome structure can be realized in such system with the d- and s-wave symmetries of the gap corresponding to the low hole-doping and heavily hole overdoped cases, respectively. © 2021, CC BY.

关键词： Copper oxides

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Demonstrating the quasilocalized nature of the Sn impurity states in Bi2Te2Se

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Physical Review B 2025年第20期111卷 205202-205202页

作者： Adèle Léon Kacper Pryga Arthur Wieder Ilayda Terzi Petr Levinský Sylvie Migot Jaafar Ghanbaja Soufiane El Oualid Bertrand Lenoir Bartlomiej Wiendlocha Christophe Candolfi Université de Lorraine CNRS IJL F-54000 Nancy France AGH University of Krakow Faculty of Physics and Applied Computer Science Aleja Mickiewicza 30 30-059 Krakow Poland FZU – Institute of Physics of the Czech Academy of Sciences Cukrovarnická 10/112 16200 Prague 6 Czech Republic

Binary M2X3 compounds (M=Sb, Bi and X=S, Se, Te) and their solid solutions are among the most efficient materials for thermoelectric applications near room temperature. In the canonical compound Bi2Te3, Sn has been shown to induce a resonant level (RL) ∼15 meV below the valence band edge, leading to enhanced thermopower values with respect to those achieved with rigidlike impurities. However, the question of whether Sn is still a resonant impurity in ternary alloys and notably, in the topological insulator Bi2Te2Se, remains unsettled. Here, we demonstrate experimentally that Sn loses its resonant character in Bi2Te2Se. Alloying with Pb in Bi1.99−ySn0.01PbyTe2Se rigidly shifts the chemical potential towards the valence bands and reveals a metal-insulator transition at low temperatures, which can be well described by an Sn impurity level that dominates the electrical conduction up to y=0.020. Further increasing y to 0.025 and 0.030 progressively restores a conventional valence band conduction. The presence of the Sn impurity level that forms a density-of-states peak disconnected from the valence band manifold is supported by electronic band structure calculations. Due to the quasilocalized nature of this impurity level, the addition of Sn does not enhance the thermopower values compared to those measured in Sn-free samples, resulting in comparable thermoelectric performance, with a peak ZT value of 0.70 achieved at 425 K for y=0.01.

关键词： Metal insulator transition

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Transverse momentum broadening of medium-induced cascades in expanding media

arXiv

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arXiv 2022年

作者： Adhya, Souvik Priyam Kutak, Krzysztof Placzek, Wies law Rohrmoser, Martin Tywoniuk, Konrad Institute of Nuclear Physics Polish Academy of Sciences ul. Radzikowskiego 152 Krakow31-342 Poland Brookhaven National Aboratory Physics Department Bldg. 510A 20 Pennsylvania Street 30-059 UptonNY11973 United States Institute of Applied Computer Science Jagiellonian University ul. ojasiewicza 11 Krakow30-348 Poland Faculty of Material Engineering and Physics Cracow University of Technology ul. Podchoŗ a zych 1 Krakow30-084 Poland Department of Physics and Technology University of Bergen Bergen5007 Norway

In this work, we explore the features of gluonic cascades in static and Bjorken expanding media by numerically solving the full BDIM evolution equations in longitudinal momentum fraction x and transverse momentum k using the Monte Carlo event generator MINCAS. Confirming the scaling of the energy spectra at low-x, discovered in earlier works, we use this insight to compare the amount of broadening in static and expanding media. We compare angular distributions for the in-cone radiation for different medium profiles with the effective scaling laws and conclude that the out-of-cone energy loss proceeds via the radiative break-up of hard fragments, followed by an angular broadening of soft fragments. While the dilution of the medium due to expansion significantly affects the broadening of the leading fragments, we provide evidence that in the low-x regime, which is responsible for most of the gluon multiplicity in the cascade, the angular distributions are very similar when comparing different medium profiles at an equivalent, effective in-medium path length. This is mainly due to the fact that in this regime, the broadening is dominated by multiple splittings. Finally, we discuss the impact of our results on the phenomenological description of the out-of-cone radiation and jet quenching. © 2022, CC BY.

关键词： Angular distribution

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Generic Hardware Realization of K Nearest Neighbors on FPGA

Generic Hardware Realization of K Nearest Neighbors on FPGA

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International Conference on Microelectronics, ICM

作者： Mohammed H. Yacoub Samar M. Ismail Lobna A. Said Ahmed H. Madian Ahmed G. Radwan Nanoelectronics Integrated Systems Center (NISC) Nile University Giza Egypt School of Engineering and Computer Science University of Hertfordshire (UH-GAF) Egypt Radiation Engineering Department National Centre for Radiation Research and Technology Cairo Egypt Engineering Mathematics and Physics Department Faculty of Engineering Cairo University Giza Egypt School of Engineering and Applied Sciences Nile University Giza Egypt

ISBN: (纸本)9781665493253

K Nearest Neighbors (KNN) algorithm is a straight-forward yet powerful Machine Learning (ML) tool widely used in classification, clustering, and regression applications. In this work, KNN is applied, with three distance metrics, to classify different datasets, experimentally testing each distance metric effect on the classification performance. A static K is applied for the whole dataset optimally chosen based on a 5-fold cross-validation. A reconfigurable hardware realization on field programmable gate array (FPGA) of each distance metric applying selection sort algorithm is proposed. The FPGA realization reaches a throughput up to 4.44 Gbit/sec while only occupying 1% of the Genesys 2 Kintex-7 board area. The algorithm managed to classify all the tested datasets with above 90% accuracy.

关键词： Measurement Software algorithms Euclidean distance Chebyshev approximation Throughput Hardware Software

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Optimal Measurement Structures for Contextuality Applications

arXiv

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arXiv 2022年

作者： Liu, Yuan Ramanathan, Ravishankar Horodecki, Karol Rosicka, Monika Horodecki, Pawel Department of Computer Science The University of Hong Kong Pokfulam Road Hong Kong Institute of Informatics National Quantum Information Centre Faculty of Mathematics Physics and Informatics University of Gdańsk Wita Stwosza 57 Gdańsk80-308 Poland International Centre for Theory of Quantum Technologies University of Gdańsk Wita Stwosza 63 Gdańsk80-308 Poland Faculty of Applied Physics and Mathematics Gdańsk University of Technology Gabriela Narutowicza 11/12 Gdańsk80-233 Poland

The Kochen-Specker (KS) theorem is a corner-stone result in the foundations of quantum mechanics describing the fundamental difference between quantum theory and classical non-contextual theories. Recently specific substructures termed 01-gadgets were shown to exist within KS proofs that capture the essential contradiction of the theorem. Here, we show these gadgets and their generalizations provide an optimal toolbox for contextuality applications including (i) constructing classical channels exhibiting entanglement-assisted advantage in zero-error communication, (ii) identifying large separations between quantum theory and binary generalised probabilistic theories, and (iii) finding optimal tests for contextuality-based semi-device-independent randomness generation. Furthermore, we introduce and study a generalisation to definite prediction sets for more general logical propositions, that we term higher-order gadgets. We pinpoint the role these higher-order gadgets play in KS proofs by identifying these as induced subgraphs within KS graphs and showing how to construct proofs of state-independent contextuality using higher-order gadgets as building blocks. The constructions developed here may help in solving some of the remaining open problems regarding minimal proofs of the Kochen-Specker theorem. Copyright © 2022, The Authors. All rights reserved.

关键词： Quantum entanglement

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A Kinetic Simulator For Distributed Mechanically Linked Marine Vehicles

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IFAC-PapersOnLine 2021年第16期54卷 266-272页

作者： Theresa Köster Angelo Odetti Matthias Loth Thomas Glotzbach Massimo Caccia Technische Hochschule Mittelhessen University of Applied Sciences Department of Electrical Engineering and Information Technology Giessen Germany Justus Liebig University Faculty 07 - Mathematics and Computer Science Physics Geography Giessen Germany Consiglio Nazionale delle Ricerche (CNR) Istituto di Ingegneria del Mare (CNR-INM) Genoa Italy

The possibility of performing high-level simulations based on a kinetic model is an important step in the implementation of navigation, guidance, and control systems for marine robots. In the framework of the EUMR TNA project DINGOS, we strive to enhance a simulation tool under MATLAB/Simulink for the CNR catamaran-like vehicle SWAMP (Shallow Water Autonomous Multipurpose Platform) ASV. The vehicle can be separated into two hull vessels that can operate independently, but also with different physical connection between them (like fixed pole or rubber band). In the paper, we will describe the physical modelling of the different connection types in a 3DOF system, the implementation into the existing simulation tool for the whole vehicle, and show the results achieved in simulation runs where different connection types can be chosen and parameterized.

关键词： Maritime robotics (underwater surface aerial) Modeling identification simulation control of marine systems Autonomous remotely operated (surface underwater) marine vessels Offshore systems modeling control Environmental monitoring

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