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arXiv 2020年

作者： Lhorodecki, Pawe Rudnicki, Lukasz Życzkowski, Karol University of Gdańsk Sopot81-824 Poland University of Gdańsk Gdańsk80-308 Poland Faculty of Applied Physics and Mathematics Technical University of Gdańsk Gdańsk80-952 Poland Center for Theoretical Physics Polish Academy of Sciences Aleja Lotników 32/46 Warsaw02-668 Poland Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Kraków30-348

Five selected problems in the theory of quantum information are presented. The first four concern existence of certain objects relevant for quantum information, namely mutually unbiased bases in dimension six, an infinite family of symmetric informationally complete generalized measurements, absolutely maximally entangled states for four subsystems with six levels each and bound entangled states with negative partial transpose. The last problem requires checking whether a certain state of a two-ququart system is 2-copy distillable. Finding a correct answer to any of them will be rewarded by the Golden KCIK Award established by the National Quantum Information Centre (KCIK) in Poland. A detailed description of the problems in question, the motivation to analyze them, as well as the rules for the open competition are provided. Copyright © 2020, The Authors. All rights reserved.

关键词： Quantum optics

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Search for effective Lorentz and CPT violation using ZEUS data

arXiv

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arXiv 2022年

作者： Abt, I. Aggarwal, R. Aushev, V. Behnke, O. Bertolin, A. Bloch, I. Brock, I. Brook, N.H. Brugnera, R. Bruni, A. Bussey, P.J. Caldwell, A. Catterall, C.D. Chwastowski, J. Ciborowski, J. Ciesielski, R. Cooper-Sarkar, A.M. Corradi, M. Dementiev, R.K. Dusini, S. Ferrando, J. Foster, B. Gallo, E. Gangadharan, D. Garfagnini, A. Geiser, A. Grzelak, G. Gwenlan, C. Hochman, D. Jomhari, N.Z. Kadenko, I. Karshon, U. Kaur, P. Klanner, R. Korzhavina, I.A. Kovalchuk, N. Kuze, M. Levchenko, B.B. Levy, A. Löhr, B. Lohrmann, E. Longhin, A. Lorkowski, F. Lunghi, E. Makarenko, I. Malka, J. Masciocchi, S. Nagano, K. Nam, J.D. Onishchuk, Yu. Paul, E. Pidhurskyi, I. Polini, A. Przybycień, M. Quintero, A. Ruspa, M. Schneekloth, U. Schörner-Sadenius, T. Selyuzhenkov, I. Shchedrolosiev, M. Shcheglova, L.M. Sherrill, N. Skillicorn, I.O. Slomiński, W. Solano, A. Stanco, L. Stefaniuk, N. Surrow, B. Tokushuku, K. Turkot, O. Tymieniecka, T. Verbytskyi, A. Abdullah, W.A.T. Wan Wichmann, K. Wing, M. Yamada, S. Yamazaki, Y. Żarnecki, A.F. Zenaiev, O. Max-Planck-Institut für Physik München Germany DST-Inspire Faculty Department of Technology SPPU India Department of Nuclear Physics National Taras Shevchenko University of Kyiv Kyiv Ukraine Deutsches Elektronen-Synchrotron DESY Notkestr. 85 Hamburg22607 Germany INFN Padova Padova Italy Deutsches Elektronen-Synchrotron DESY Platanenallee 6 Zeuthen15738 Germany Physikalisches Institut der Universität Bonn Bonn Germany Physics and Astronomy Department University College London London United Kingdom Dipartimento di Fisica e Astronomia dell’ Università INFN Padova Italy INFN Bologna Bologna Italy School of Physics and Astronomy University of Glasgow Glasgow United Kingdom Department of Physics York University ONM3J 1P3 Canada The Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Krakow Poland Faculty of Physics University of Warsaw Warsaw Poland Department of Physics University of Oxford Oxford United Kingdom Affiliated with an Institute Covered by a Current or former Collaboration Agreement with DESY Hamburg University Institute of Experimental Physics Hamburg Germany Physikalisches Institut of the University of Heidelberg Heidelberg Germany Department of Particle Physics and Astrophysics Weizmann Institute Rehovot Israel Sant Longowal Institute of Engineering and Technology Punjab Longowal India Department of Physics Tokyo Institute of Technology Tokyo Japan Raymond and Beverly Sackler Faculty of Exact Sciences School of Physics Tel Aviv University Tel Aviv Israel Department of Physics Indiana University Bloomington BloomingtonIN47405 United States GSI Helmholtzzentrum für Schwerionenforschung GmbH Darmstadt Germany Institute of Particle and Nuclear Studies KEK Tsukuba Japan Department of Physics Temple University PhiladelphiaPA19122 United States Institut für Kernphysik Goethe Universität Frankfurt am Main Germany AGH University of Science and Technology Faculty of Physics and Applied Computer Science Kra

Lorentz and CPT symmetry in the quark sector of the Standard Model are studied in the context of an effective field theory using ZEUS e±p data. Symmetry-violating effects can lead to time-dependent oscillations of otherwise time-independent observables, including scattering cross sections. An analysis using five years of inclusive neutral-current deep inelastic scattering events corresponding to an integrated HERA luminosity of 372 pb−1 at √s = 318 GeV has been performed. No evidence for oscillations in sidereal time has been observed within statistical and systematic uncertainties. Constraints, most for the first time, are placed on 42 coefficients parameterising dominant CPT-even dimension-four and CPT-odd dimension-five spin-independent modifications to the propagation and interaction of light quarks. © 2022, CC BY.

关键词： Germanium alloys

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Optimal energy generation of hybrid energy systems considering economic and environmental multi-objective functions

Science and Technology for Energy Transition (STET)

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science and Technology for Energy Transition (STET) 2025年 80卷

作者： Raman, Arasu Sayed, Biju Theruvil Alkhayyat, Ahmad Ved, Amit Chetan, M. Singh, Ashish Kumar, Raj Prasad, K.D.V. Sapaev, I.B. Mohammedi, M. Department of Faculty of Business and Communications Inti International University Putra Nilai 71800 Malaysia Department of Computer Science Dhofar University PO Box 2509 Salalah211 Oman Department of Computers Techniques Engineering College of Technical Engineering The Islamic University Najaf Iraq Department of Computers Techniques Engineering College of Technical Engineering The Islamic University of Al Diwaniyah Al Diwaniyah Iraq Department of Computers Techniques Engineering College of Technical Engineering The Islamic University of Babylon Babylon Iraq Marwadi University Research Centre Department of Electrical Engineering Faculty of Engineering and Technology Marwadi University Gujarat Rajkot360003 India Karnataka Bangalore India Nims School of Electrical and Electronics Engineering Nims University Rajasthan Jaipur India Chandigarh College of Engineering Chandigarh Group of Colleges Jhanjeri Punjab Mohali140307 India Pune India Department Physics and Chemistry Tashkent Institute of Irrigation and Agricultural Mechanization Engineers National Research University Tashkent Uzbekistan University of Tashkent for Applied Sciences Str. Gavhar 1 Tashkent100149 Uzbekistan Western Caspian University Baku Azerbaijan Department of Electrical Engineering Islamic Azad University Branch of Central Tehran Tehran Iran

This research is dedicated to exploring and identifying the most effective design for an energy source tailored specifically to meet the electricity demands of a residential community. In an era where energy efficiency and sustainability are paramount, this study emphasizes the importance of technical and economic considerations in energy sourcing. It posits that any viable solution must not only be efficient in its energy production and consumption but also reliable in its delivery and financially feasible for the residents who will depend on it. To address this multifaceted challenge, the study proposes the innovative use of a rotation-invariant coordinate convolutional neural network in conjunction with binary battle royale optimization techniques. These advanced methodologies are selected for their potential to enhance the modelling and optimization processes involved in energy source design. The primary goal of employing these methods is to minimize two critical factors: the net present cost of the energy system and the overall energy cost incurred by the residents. By focusing on these objectives, the research aims to ensure that the proposed energy solutions are not only cost-effective but also sustainable over the long term. To rigorously test the proposed model and evaluate its performance, the research is conducted using the MATLAB platform. The study employs established methodologies and performance metrics to assess the outcomes of the model, ensuring that the findings are both credible and applicable to real-world scenarios. Through comprehensive testing and detailed analysis, this research aims to provide significant insights and actionable recommendations for the optimal design of energy sources in residential areas. By contributing to the ongoing discourse on sustainable energy solutions, the study seeks to inform policymakers, energy planners, and community stakeholders about effective strategies for meeting residential energy demands while promotin

关键词： Clean energy

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Field-driven metamorphoses of isolated skyrmions within the conical state of cubic helimagnets

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Physical Review B 2021年第6期104卷 064432-064432页

作者： Andrey O. Leonov C. Pappas Ivan I. Smalyukh Department of Chemistry Faculty of Science Hiroshima University Kagamiyama Higashi Hiroshima Hiroshima 739-8526 Japan Chirality Research Center Hiroshima University Higashi Hiroshima Hiroshima 739-8526 Japan IFW Dresden Postfach 270016 D-01171 Dresden Germany Faculty of Applied Sciences Delft University of Technology Mekelweg 15 2629JB Delft The Netherlands Soft Materials Research Center and Materials Science and Engineering Program University of Colorado Boulder Colorado 80309 USA Department of Physics and Department of Electrical Computer and Energy Engineering University of Colorado Boulder Colorado 80309 USA Renewable and Sustainable Energy Institute National Renewable Energy Laboratory and University of Colorado Boulder Colorado 80309 USA

Topologically stable field configurations appear in many fields of physics, from elementary particles to condensed matter and cosmology. Deep physical relations and common physical features of a large variety of very different solitonic states in these systems arise from the mathematical similarity of phenomenological equations. During the last decade, chiral liquid crystals and chiral magnets took on the role of model objects for the experimental investigation of topological solitons and the understanding of their nonsingular field configurations. This is directly related to the discovery of particle-like chiral skyrmions, which are also considered as promising ingredients for technological applications. Here we introduce a paradigm of facile skyrmionic networks with mutually orthogonal orientations of constituent isolated skyrmions. On the one hand, such networks are envisioned as a novel concept of spintronic devices based, e.g., on gapless skyrmion motion along each other, and are presumably responsible for precursor phenomena near the ordering temperatures of bulk cubic helimagnets. In particular, we demonstrate an interconversion between mutually orthogonal skyrmions: horizontal skyrmions may swirl into an intermediate spring-like state and subsequently squeeze into vertical skyrmions with both polarities. On the other hand, skyrmion tubes are considered as building blocks for particle-like states with more involved internal structure. A family of target-skyrmions, which includes a so far overlooked type with a multiple topological charge, is formed owing to the tendency to minimize the interaction energy between vertical and horizontal skyrmions. The conical phase serves as a suitable background for considered skyrmion evolution. It substantializes the attracting skyrmion-skyrmion interaction in the skyrmionic networks, shapes their internal structure, and guides the nucleation processes. Alternatively, intricate textural changes of isolated skyrmions result

关键词： Skyrmions Chiral magnets Cholesteric liquid crystals Helimagnets

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Anisotropy of the spin-orbit coupling driven by a magnetic field in InAs nanowires

arXiv

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arXiv 2020年

作者： Wójcik, Pawel Bertoni, Andrea Goldoni, Guido AGH University of Science and Technology Faculty of Physics and Applied Computer Science Al. Mickiewicza 30 Krakow30-059 Poland CNR-NANO S3 Istituto Nanoscienze Via Campi 213/a Modena41125 Italy Department of Physics Informatics and Mathematics University od Modena and Reggio Emilia Italy

We use the k · p theory and the envelope function approach to evaluate the Rashba spin-orbit coupling induced in a semiconductor nanowire by a magnetic field at different orientations, taking explicitely into account the prismatic symmetry of typical nano-crystals. We make the case for the strongly spin-orbit-coupled InAs semiconductor nanowires and investigate the anisotropy of the spin-orbit constant with respect to the field direction. At sufficiently high magnetic fields perpendicular to the nanowire, a 6-fold anisotropy results from the interplay between the orbital effect of field and the prismatic symmetry of the nanowire. A back-gate potential, breaking the native symmetry of the nano-crystal, couples to the magnetic field inducing a 2-fold anisotropy, with the spin-orbit coupling being maximized or minimized depending on the relative orientation of the two fields. We also investigate in-wire field configurations, which shows a trivial 2-fold symmetry when the field is rotated off the axis. However, isotropic spin-orbit coupling is restored if a sufficiently high gate potential is applied. Our calculations are shown to agree with recent experimental analysis of the vectorial character of the spin-orbit coupling for the same nanomaterial, providing a microscopic interpretation of the latter. Copyright © 2020, The Authors. All rights reserved.

关键词： Nanowires

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Complexity in economic and social systems: Cryptocurrency market at around COVID-19

arXiv

引用

arXiv 2020年

作者： Drożdż, Stanislaw Kwapień, Jaroslaw Oświęcimka, Pawel Stanisz, Tomasz Wątorek, Marcin Complex Systems Theory Department Institute of Nuclear Physics Polish Academy of Sciences ul. Radzikowskiego 152 Kraków31-342 Poland Faculty of Computer Science and Telecommunication Cracow University of Technology ul. Warszawska 24 Kraków31-155 Poland Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University ul. prof. Stanislawa Lojasiewicza 11 Kraków30-348 Poland

Social systems are characterized by an enormous network of connections and factors that can influence the structure and dynamics of these systems. Among them the whole economical sphere of human activity seems to be the most interrelated and complex. All financial markets, including the youngest one, the cryptocurrency market, belong to this sphere. The complexity of the cryptocurrency market can be studied from different perspectives. First, the dynamics of the cryptocurrency exchange rates to other cryptocurrencies and fiat currencies can be studied and quantified by means of multifractal formalism. Second, coupling and decoupling of the cryptocurrencies and the conventional assets can be investigated with the advanced cross-correlation analyses based on fractal analysis. Third, an internal structure of the cryptocurrency market can also be a subject of analysis that exploits, for example, a network representation of the market. In this work, we approach the subject from all three perspectives based on data from a recent time interval between January 2019 and June 2020. This period includes the peculiar time of the Covid-19 pandemic;therefore, we pay particular attention to this event and investigate how strong its impact on the structure and dynamics of the market was. Besides, the studied data covers a few other significant events like double bull and bear phases in 2019. We show that, throughout the considered interval, the exchange rate returns were multifractal with intermittent signatures of bifractality that can be associated with the most volatile periods of the market dynamics like a bull market onset in April 2019 and the Covid-19 outburst in March 2020. The topology of a minimal spanning tree representation of the market also used to alter during these events from a distributed type without any dominant node to a highly centralized type with a dominating hub of USDT. However, the MST topology during the pandemic differs in some details from other volati

关键词： Electronic money

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Hierarchy of magnon mode entanglement in antiferromagnets

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Physical Review B 2020年第22期102卷 224418-224418页

作者： Vahid Azimi Mousolou Andrey Bagrov Anders Bergman Anna Delin Olle Eriksson Yuefei Liu Manuel Pereiro Danny Thonig Erik Sjöqvist Department of Physics and Astronomy Uppsala University Box 516 SE-751 20 Uppsala Sweden Department of Applied Mathematics and Computer Science Faculty of Mathematics and Statistics University of Isfahan Isfahan 81746-73441 Iran School of Mathematics Institute for Research in Fundamental Sciences (IPM) P. O. Box 19395-5746 Tehran Iran Theoretical Physics and Applied Mathematics Department Ural Federal University Ekaterinburg 620002 Russia Department of Applied Physics School of Engineering Sciences KTH Royal Institute of Technology AlbaNova University Center SE-10691 Stockholm Sweden Swedish e-Science Research Center (SeRC) KTH Royal Institute of Technology SE-10044 Stockholm Sweden School of Science and Technology Örebro University SE-701 82 Örebro Sweden

Continuous variable entanglement between magnon modes in Heisenberg antiferromagnets with Dzyaloshinskii-Moriya (DM) interaction is examined. Different bosonic modes are identified, which allows us to establish a hierarchy of magnon entanglement. We argue that entanglement between magnon modes is determined by a simple lattice-specific parameter, together with the ratio of the strengths of the DM and Heisenberg exchange interactions, and that magnon entanglement can be detected by means of quantum homodyne techniques. As an illustration of the relevance of our findings for possible entanglement experiments in the solid state, a typical antiferromagnet with the perovskite crystal structure is considered, and it is shown that long wave length magnon modes have a maximal degree of entanglement.

关键词： Magnons Quantum entanglement Antiferromagnets

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Charged spinning and magnetized test particles orbiting quantum improved charged black holes

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European Physical Journal C 2023年第11期83卷 989页

作者： Ladino, Jose Miguel Benavides-Gallego, Carlos A. Larrañaga, Eduard Rayimbaev, Javlon Abdulxamidov, Farrux Universidad Nacional de Colombia Sede Bogotá Facultad de Ciencias Observatorio Astronómico Nacional Ciudad Universitaria Bogotá111321 Colombia School of Physics and Astronomy Shanghai Jiao Tong University 800 Dongchuan Road Minhang Shanghai200240 China Shanghai Frontiers Science Center of Gravitational Wave Detection 800 Dongchuan Road Minhang Shanghai200240 China Faculty of Computer Engineering Tashkent University of Applied Sciences Gavhar Str. 1 Tashkent100149 Uzbekistan School of Engineering Central Asian University Tashkent111221 Uzbekistan Institute of Fundamental and Applied Research National Research University TIIAME Kori Niyoziy 39 Tashkent100000 Uzbekistan National University of Uzbekistan Tashkent100174 Uzbekistan Tashkent State Technical University Tashkent100095 Uzbekistan School of Mathematics and Natural Sciences New Uzbekistan University Movarounnahr Str. 1 Tashkent100000 Uzbekistan Ulugh Beg Astronomical Institute Astronomy str. 33 Tashkent100052 Uzbekistan

In the present work, we aimed to investigate the dynamics of spinning charged and magnetized test particles around both electrically and magnetically charged quantum-improved black holes. We derive the equations of motion for charged spinning test particles using the Mathisson-Papapetrou-Dixon ***equations with the Lorentz coupling term. The radius of innermost stable circular orbits (ISCOs), specific angular momentum, and energy for charged spinless, uncharged spinning, and charged spinning test particles around the charged and non-charged quantum-improved black holes are analyzed separately. We found that the quantum parameter increases the maximum spin value, smax , which leads to the nonphysical motion (superluminal motion) of the charged spinning test particle. In contrast, the black hole charge decreases its value. We also found that, in contrast to the Reissner Nordström black hole, spinning charged test particles in the quantum-improved charged black hole have higher smax;moreover, positively charged spinning particles can have higher values of smax near the extreme black hole cases when compared with uncharged spinning particles. Finally, we investigate the magnetized test particle’s dynamics in the spacetime of a quantum-improved magnetically charged black hole in Quantum Einstein Gravity using the Hamilton–Jacobi equation. We show that the presence of ω increases the maximum value of the effective potential and decreases the minimum energy and angular momentum of magnetized particles at their circular orbits. We found an upper constraint in the black hole charge at the ISCO. © 2023, The Author(s).

关键词： Black holes

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Towards a new approach to nature-inspired design of architecture 5

Towards a new approach to nature-inspired design of architec...

引用

5th International Conference on Design Creativity, ICDC 2018

作者： Mars, A. Grabska, E. Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Kraków Poland

ISBN: (纸本)9781904670834

This paper proposes a new approach to architecture design, which enables nature-inspired modification of buildings prototypes. In the proposed method, analogy between a prototype and a class of natural objects (e.g. plant species) is found with the use of a knowledge base of natural forms. To define classes of natural objects, a generative tool called graph grammar is used. Matching a building prototype with a class of natural forms enables application of a graph grammar on the building model, which results in a nature-related aspects of an architectionic object. The main objective is to propose a method of computational design, which can be verified with regard to its capability of imitating human process of creatve design of architecture. This will help to learn more about alghoritmising of creative processes. © 2018 Design Society. All rights reserved.

关键词： computer aided design

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No-go theorem for device-independent security in relativistic causal theories

引用

Physical Review Research 2021年第3期3卷 033146-033146页

作者： R. Salazar M. Kamoń K. Horodecki D. Goyeneche D. Saha R. Ramanathan P. Horodecki Institute of Theoretical Physics and Astrophysics National Quantum Information Centre University of Gdansk 80-308 Gdansk Poland Faculty of Applied Physics and Mathematics National Quantum Information Centre Gdansk University of Technology 80-233 Gdansk Poland Institute of Informatics Faculty of Mathematics Physics and Informatics University of Gdansk 80-308 Gdansk Poland Institute of Physics Jagiellonian University 30-059 Krakow Poland International Centre for Theory of Quantum Technologies University of Gdansk Wita Stwosza 63 80-308 Gdansk Poland Departamento de Física Facultad de Ciencias Básicas Universidad de Antofagasta Casilla 170 Antofagasta Chile Center for Theoretical Physics Polish Academy of Sciences Aleja Lotników 32/46 02-668 Warsaw Poland Department of Computer Science University of Hong Kong Pokfulam Road Hong Kong

A fundamental question in device-independent quantum cryptography is to determine the minimal physical principle upon which the security of such a cryptographic protocol (such as for key distribution or for randomness generation) may be based. Since the seminal work on device-independent quantum key distribution by J. Barrett, L. Hardy, and A. Kent [Phys. Rev. Lett. 95, 010503 (2005)], a conjectured candidate for certification of device-independent security has been the principle of relativistic causality, namely the disallowance of causal loops. While this principle has thus far been equated with the no-signaling constraints, it has been shown recently that in multiparty Bell scenarios, the no-signaling constraints are sufficient but not necessary for relativistic causality, and a refined set of constraints has been proposed that more precisely capture the notion of relativistic causality. In this paper, we build upon this finding to show that, in contrast to the no-signaling constraints, the constraints of relativistic causality are not sufficient for certification of device-independent security. More specifically, we show that there exist correlations allowed by the causality principle that allow an adversary to gain complete information about the measurement outcomes of honest parties in any device-independent cryptographic protocol, thereby rendering the protocol completely insecure. As a tool to develop this adversarial attack strategy, we fully characterize the set of correlations allowed by relativistic causality in the tripartite Bell scenario of three parties, each performing two binary measurements, that may be of independent interest. We also demonstrate the difference between the relativistic causal correlations and those allowed by the usual no-signaling constraints by presenting explicit communication tasks wherein the two sets exhibit striking difference in their respective winning probabilities.

关键词： General relativity Nonlocality Quantum communication Quantum correlations in quantum information Quantum cryptography

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