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Multipartite channel assemblages

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arXiv 2022年

作者： Banacki, Michal Ramanathan, Ravishankar Horodecki, Pawel International Centre for Theory of Quantum Technologies University of Gdańsk Jana Ba zý nskiego 1A Gdańsk80-309 Poland Institute of Theoretical Physics and Astrophysics Faculty of Mathematics Physics and Informatics University of Gdańsk Wita Stwosza 57 Gdańsk80-308 Poland Department of Computer Science The University of Hong Kong Pokfulam Road Hong Kong Faculty of Applied Physics and Mathematics Gdańsk University of Technology Gabriela Narutowicza 11/12 Gdańsk80-233 Poland

Motivated by the recent studies on post-quantum steering, we generalize notion of bipartite channels steering by introducing the concept of multipartite no-signaling channel assemblages. We show that beyond the bipartite case, no-signaling and quantum description of such scenarios do not coincide. With a help of Choi-Jamiolkowski isomorphism we present full description of considered classes of assemblages and in particular, we use this characterization to provide sufficient conditions for extremality of quantum channel assemblages in the set of all no-signaling channel assemblages. Finally, in the tripartite case, we introduce and discuss a relaxed version of channel steering where only certain subsystems obey no-signaling constrains. In this asymmetric scenario we are able to provide exactly 1 bit of key that is secure against no-signaling eavesdropper. Copyright © 2022, The Authors. All rights reserved.

关键词： Signaling

Gordon decomposition of the magnetizability of a Dirac one-electron atom in an arbitrary discrete energy state

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arXiv 2020年

作者： Stefańska, Patrycja Institute of Physics and Applied Computer Science Faculty of Applied Physics and Mathematics Gdańsk University of Technology Narutowicza 11/12 Gdańsk80–233 Poland

We present a Gordon decomposition of the magnetizability of a Dirac one-electron atom in an arbitrary discrete energy eigenstate, with a pointlike, spinless, and motionless nucleus of charge Ze. The external magnetic field, by which the atomic state is perturbed, is assumed to be weak, static, and uniform. Using the Sturmian expansion of the generalized Dirac–Coulomb Green function proposed by Szmytkowski in 1997, we derive a closed-form expressions for the diamagnetic (χd) and paramagnetic (χp) contributions to χ. Our calculations are purely analytical;the received formula for χp contains the generalized hypergeometric functions 3F2 of the unit argument, while χd is of an elementary form. For the atomic ground state, both results reduce to the formulas obtained earlier by other author. This work is a prequel to our recent article, where the numerical values of χd and χp for some excited states of selected hydrogenlike ions with 1 ≤ Z ≤ 137 were obtained with the use of the general formulas derived here. Copyright © 2020, The Authors. All rights reserved.

关键词： Atoms

Development of the normalization method for the first large field-of-view plastic-based PET Modular scanner

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arXiv 2024年

作者： Coussat, A. Krzemien, W. Baran, J. Parzych, S. Beyene, E. Chug, N. Curceanu, C. Czerwiński, E. Das, M. Dulski, K. Eliyan, K.V. Jasińska, B. Kacprzak, K. Kaplon, L. Klimaszewski, K. Korcyl, G. Kozik, T. Kubat, K. Kumar, D. Kunimal Vendan, A. Lisowski, E. Lisowski, F. Mędrala-Sowa, J. Moyo, S. Mryka, W. Niedźwiecki, S. Pandey, P. del Rio, E. Perez Raczyński, L. Rädler, M. Sharma, S. Skurzok, M. Stępień, E.L. Tayefi, K. Tanty, P. Wiślicki, W. Moskal, P. Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Lojasiewicza 11 Kraków Poland Center for Theranostics Jagiellonian University Kopernika 40 Kraków Poland High Energy Physics Division National Centre for Nuclear Research Andrzeja Soltana 7 Otwock-Świerk Poland INFN Laboratori Nazionali di Frascati Via E. Fermi 40 Frascati00044 Italy Institute of Physics Maria Curie-Sklodowska University Radziszewskiego 10 Lublin20-031 Poland Department of Complex Systems National Centre for Nuclear Research Andrzeja Soltana 7 Otwock-Świerk Poland Cracow University of Technology Warszawska 24 Kraków31-864 Poland

Background In positron emission tomography acquisition, sensitivity along a line-of-response can vary due to crystal geometrical arrangements in the scanner and/or detector inefficiencies, leading to severe artefacts in the reconstructed image. To mitigate these effects, data must be corrected by a set of normalization coefficients applied to each line of response. The J-PET Modular scanner is a positron emission tomograph made of 50 cm long plastic strips arranged axially. with signal read-outs from both sides. This design significantly reduces the overall cost of the scanner and is well-suitable for the development of long axial field-of-view and total-body devices. The scanner is assembled from a set of stand-alone detection modules connected to front-end electronics. Each module forms a lightweight, independent unit which can be easily transported and assembled in various configurations. In its default configuration, the modules are arranged cylindrically side-by-side with a pitch of 7.5◦, resulting in a radius of about 76.2 cm and an axial field-of-view of 50 cm. The Modular J-PET scanner is currently in operation at the Jagiellonian University in Kraków (Poland). Methods We have implemented a normalization method for the large field-of-view plastic-based J-PET Modular scanner using the component-based approach. We considered a normalization model that incorporates both geometric and detection efficiency factors. We estimated the geometric normalization factors for the J-PET Modular scanner using Monte Carlo simulations. We also analysed the effects of variations in detection efficiency. A dedicated cylindrical phantom was simulated to investigate the impact of various factors on image quality. The image quality was quantified in terms of radial and axial uniformity metrics, and the standard deviation to mean intensity ratio, determined for a set of image slices. Results Without normalization, reconstructions of a uniform cylinder exhibit artefacts in the form

关键词： Positrons

Experimental genuine quantum nonlocality in the triangle network

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arXiv 2024年

作者： Wang, Ning-Ning Zhang, Chao Cao, Huan Xu, Kai Liu, Bi-Heng Huang, Yun-Feng Li, Chuan-Feng Guo, Guang-Can Gisin, Nicolas Kriváchy, Tamás Renou, Marc-Olivier CAS Key Laboratory of Quantum Information University of Science and Technology of China Hefei230026 China CAS Center For Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Hefei230026 China Hefei National Laboratory University of Science and Technology of China Hefei230088 China Vienna1090 Austria Christian Doppler Laboratory for Photonic Quantum Computer Faculty of Physics University of Vienna Vienna1090 Austria Group of Applied Physics University of Geneva Geneva 41211 Switzerland Constructor University Geneva Switzerland ICFO - Institut de Ciencies Fotoniques The Barcelona Institute of Science and Technology Castelldefels Barcelona08860 Spain Atominstitut Technische Universität Wien Vienna1020 Austria Inria Paris-Saclay Bâtiment Alan Turing 1 rue Honoré d’Estienne d’Orves Palaiseau91120 France CPHT Ecole polytechnique Institut Polytechnique de Paris Route de Saclay Palaiseau91128 France

In the last decade, it was understood that quantum networks involving several independent sources of entanglement which are distributed and measured by several parties allowed for completely novel forms of non-classical quantum correlations, when entangled measurements are performed. Here, we experimentally obtain quantum correlations in a triangle network structure, and provide solid evidence of its nonlocality. Specifically, we first obtain the elegant distribution proposed in [1] by performing a six-photon experiment. Then, we justify its nonlocality based on machine learning tools to estimate the distance of the experimentally obtained correlation to the local set, and through the violation of a family of conjectured inequalities tailored for the triangle network. Copyright © 2024, The Authors. All rights reserved.

关键词： Quantum entanglement

Harnessing Deep Learning Techniques for Enhanced Detection and Classification of Cracks in Pavement Imagery

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Procedia computer science 2024年 236卷 386-393页

作者： Knnou omar El Arbi ABDELLAOUI ALAOUI Hanae Errousso Youssef Filali Chaimae Chekira Said Agoujil MMIS Team MAIS Laboratory Faculty of Sciences and Technics Errachidia University of Moulay Ismail Morocco IEVIA team IMAGE laboratory Department of Sciences ENS Moulay Ismail University of Meknes Morocco EIGSI La Rochelle-Casablanca 17041-20410 France-Morocco National and high school of electricity and mechanic HASSAN II University 8118 Casablanca Morocco Faculty of Sciences Dhar-Mahraz 30000 Fez Morocco Computer Science and Interdisciplinary Physics Laboratory (LIPI) National School of Applied Sciences Sidi Mohamed Ben Abdellah University B.P. 5206 Route Bensouda 30003 Fez Morocco MMIS Team MAIS Laboratory École Nationale de Commerce et de Gestion Moulay Ismail University of Meknes El Hajeb Morocco

With the increased demand for infrastructure maintenance and the evolving capabilities of deep learning, there is a pressing need to apply advanced techniques for efficient and accurate detection of structural anomalies. This paper delves into the application of Convolutional Neural Networks (CNNs) and transfer learning to address the problem of pavement crack classification using images. Three distinctive models were explored: a 4-layer CNN, a 2-layer CNN, and a VGG-based transfer learning model. Through comprehensive experimentation, we demonstrate the efficacy of these models in accurately classifying Pavement cracks from a curated dataset. Our findings indicate that while each model possesses its unique strengths, the VGG-based transfer learning model exhibits superior performance in terms of precision and recall. This research not only contributes to the growing body of knowledge in infrastructure maintenance using deep learning but also provides practical insights for professionals aiming to employ automated systems for Pavement inspection.

关键词： Deep Learning Convolutional Neural Networks (CNNs) Transfer Learning VGG Model Pavement Crack Detection Image Classification Infrastructure Maintenance

Study of Ds1(2460)+→Ds+π+π- in B→D‾(*)Ds+π+π- decays

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science Bulletin 2025年第9期70卷 1432-1444页

作者： Aaij, R. Abdelmotteleb, A.S.W. Beteta, C.Abellan Abudinén, F. Ackernley, T. Adefisoye, A.A. Adeva, B. Adinolfi, M. Adlarson, P. Agapopoulou, C. Aidala, C.A. Ajaltouni, Z. Akar, S. Akiba, K. Albicocco, P. Albrecht, J. Alessio, F. Alexander, M. Aliouche, Z. Cartelle, P.Alvarez Amalric, R. Amato, S. Amey, J.L. Amhis, Y. An, L. Anderlini, L. Andersson, M. Andreianov, A. Andreola, P. Andreotti, M. Andreou, D. Anelli, A. Ao, D. Archilli, F. Argenton, M. Cuendis, S.Arguedas Artamonov, A. Artuso, M. Aslanides, E. Da Silva, R.Ataíde Atzeni, M. Audurier, B. Bacher, D. Perea, I.Bachiller Bachmann, S. Bachmayer, M. Back, J.J. Rodriguez, P.Baladron Balagura, V. Balboni, A. Baldini, W. Balzani, L. Bao, H. de Souza Leite, J.Baptista Pretel, C.Barbero Barbetti, M. Barbosa, I.R. Barlow, R.J. Barnyakov, M. Barsuk, S. Barter, W. Bartolini, M. Bartz, J. Basels, J.M. Bashir, S. Bassi, G. Batsukh, B. Battista, P.B. Bay, A. Beck, A. Becker, M. Bedeschi, F. Bediaga, I.B. Behling, N.B. Belin, S. Belous, K. Belov, I. Belyaev, I. Benane, G. Bencivenni, G. Ben-Haim, E. Berezhnoy, A. Bernet, R. Andres, *** Bertolin, A. Betancourt, C. Betti, F. Bex, J. Bezshyiko, Ia. Bhom, J. Bieker, M.S. Biesuz, N.V. Billoir, P. Biolchini, A. Birch, M. Bishop, F.C.R. Bitadze, A. Bizzeti, A. Blake, T. Blanc, F. Blank, J.E. Blusk, S. Bocharnikov, V. Boelhauve, J.A. Garcia, O.Boente Boettcher, T. Bohare, A. Boldyrev, A. Bolognani, C.S. School of Physics and Astronomy Monash University Melbourne Australia Rio de Janeiro Brazil Rio de Janeiro Brazil Department of Engineering Physics Tsinghua University Beijing China Beijing China School of Physics State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China University of Chinese Academy of Sciences Beijing China Institute of Particle Physics Central China Normal University Hubei Wuhan China San Jose Costa Rica Université Savoie Mont Blanc CNRS AnnecyIN2P3-LAPP France Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France Gif-Sur-Yvette France Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France Université Paris-Saclay CNRS/IN2P3 IJCLab Orsay France Laboratoire Leprince-Ringuet CNRS/IN2P3 Ecole Polytechnique Institut Polytechnique de Paris Palaiseau France LPNHE Sorbonne Université Paris Diderot Sorbonne Paris Cité CNRS/IN2P3 Paris France I. Physikalisches Institut RWTH Aachen University Aachen Germany Universität Bonn-Helmholtz-Institut für Strahlen und Kernphysik Bonn Germany Technische Universität Dortmund Fakultät Physik Dortmund Germany Physikalisches Institut Albert-Ludwigs-Universität Freiburg Freiburg Germany Heidelberg Germany Ruprecht-Karls-Universität Heidelberg Physikalisches Institut Heidelberg Germany School of Physics University College Dublin Dublin Iceland INFN Sezione di Bari Bari Italy INFN Sezione di Bologna Bologna Italy INFN Sezione di Ferrara Ferrara Italy INFN Sezione di Firenze Firenze Italy INFN Laboratori Nazionali di Frascati Frascati Italy INFN Sezione di Genova Genova Italy INFN Sezione di Milano Milano Italy INFN Sezione di Milano-Bicocca Milano Italy INFN Sezione di Cagliari Monserrato Italy INFN Sezione di Padova Padova Italy INFN Sezione di Perugia Perugia Italy INFN Sezione di Pisa Pisa Italy INFN Sezione di Roma La Sapienza Roma Italy INFN Sezione di Roma Tor Vergata Roma Italy Nikhef National Institute for Subatomic Physi

An amplitude analysis of the Ds1(2460)+→Ds+π+π- transition is performed simultaneously in B0→D-Ds+π+π-, B+→D‾0Ds+π+π-, and B0→D*-Ds+π+π- decays. The study is based on a data sample of proton-proton collisions recorded with the LHCb detector at centre-of-mass energies of s=7,8, and 13 TeV, corresponding to a total integrated luminosity of 9fb-1. A clear double-peak structure is observed in the m(π+π-) spectrum of the Ds1(2460)+→Ds+π+π- decay. The data can be described either with a model including f0500,f0980, and f2(1270) resonances, in which the contributions of f0(980) and f2(1270) are unexpectedly large, or with a model including f0(500), a doubly charged open-charm tetraquark state Tcs¯++ and its isospin partner Tcs¯0. If the former is considered implausible, the Tcs¯ states are observed with high significance, and the data are consistent with isospin symmetry. When imposing isospin constraints between the two Tcs¯ states, their mass and width are determined to be (2327±13±13) MeV and (96±16-23+170) MeV, respectively, where the first uncertainty is statistical and the second is systematic. The mass is slightly below the DK threshold, and a spin-parity of 0+ is favoured with high significance. © 2025 science China Press

关键词： Colliding beam accelerators

Cation Distribution in the Cu-Ni Ferrite, Based on X-Ray, Mössbauer and Magnetic Studies

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SSRN

SSRN 2023年

作者： Mazurenko, Julia Kaykan, Larysa Michalik, Jan Marek Gondek, Lukasz Zywchak, Antoni Sijo, A.K. Bandura, Khrystyna Gumiennik, Uladzislaw Ivano-Frankivsk National Medical University Halytska Str. 2 Ivano-Frankivsk76018 Ukraine G.V. Kurdyumov Institute for Metal Physics N.A.S. of Ukraine 36 Academician Vernadsky Boulevard Kiev03142 Ukraine Faculty of Physics and Applied Computer Science AGH University of Krakow Al. Mickiewicza 30 Krakow30-059 Poland Academic Centre for Materials and Nanotechnology AGH University of Krakow Al. A. Mickiewicza 30 Kraków30-059 Poland

Nanocrystalline ferrite samples with the composition CuxNi1-xFe2O4, with 0.0≤х≤1.0, were synthesized using the sol-gel autocombustion method at a neutral pH of the reaction medium. The structure and phase composition of the synthesized samples were analyzed using X-ray diffraction, and the Rietveld method was employed to interpret the results. The analysis confirmed the formation of a spinel structure and provided insights into the distribution of cations within the tetrahedral and octahedral sublattices. The synthesized compounds were found to be mixed spinels, and the degree of inversion was determined for each composition. Magnetic properties were investigated using a vibrating sample magnetometer, and the main magnetic parameters were calculated based on the experimentally obtained hysteresis loops. The maximum saturation magnetization and coercive force were found to be 59.54 emu/g and 327.8 Oe, respectively. Mössbauer spectra of 57Fe were recorded at room temperature (300K) and nitrogen temperature (77K). Changes in line width, isomeric shift, quadrupole splitting, and the magnitude of the magnetic superexchange fields for the tetrahedral and octahedral sublattices, as well as the overall system, were calculated. The cation distribution values obtained from X-ray diffraction, Mössbauer spectroscopy, and magnetic measurements were found to be agreement and consistent. © 2023, The Authors. All rights reserved.

关键词： Magnetic properties

Minimal-noise estimation of noncommuting rotations of a spin

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arXiv 2023年

作者： Czartowski, Jakub Życzkowski, Karol Braun, Daniel Doctoral School of Exact and Natural Sciences Jagiellonian University ul. Lojasiewicza 11 Kraków30-348 Poland Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University ul. Lojasiewicza 11 Kraków30-348 Poland Centrum Fizyki Teoretycznej PAN Al. Lotników 32/46 Warszawa02-668 Poland University of Gdańsk Poland Institute of Theoretical Physics University of Tübingen Auf der Morgenstelle 14 Tübingen72076 Germany

We propose an analogue of SU(1, 1) interferometry to measure rotation of a spin by using two-spin squeezed states. Attainability of the Heisenberg limit for the estimation of the rotation angle is demonstrated for maximal squeezing. For a specific squeezing direction and strength an advantage in sensitivity for all equatorial rotation axes (and hence noncommuting rotations) over the classical bound is shown in terms of quadratic scaling of the single-parameter quantum Fisher information for the corresponding rotation angles. Our results provide a method for measuring magnetic fields in any direction in the x-y-plane with the same optimized initial state. © 2023, CC BY.

关键词： Rotation

Density functional theory study of experimentally observed Au/Ge interfaces

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arXiv 2022年

作者： Sikora, Olga Sternik, Malgorzata Jany, Benedykt R. Krok, Franciszek Piekarz, Przemyslaw Oles, Andrzej M. Faculty of Materials Engineering and Physics Cracow University of Technology Podchoŗ ażych 1 KrakówPL-30084 Poland Institute of Nuclear Physics Polish Academy of Sciences W. E. Radzikowskiego 152 KrakówPL-31342 Poland Marian Smoluchowski Institute of Physics Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Lojasiewicza 11 Krakow30348 Poland Max Planck Institute for Solid State Research Heisenbergstrasse 1 StuttgartD-70569 Germany Institute of Theoretical Physics Jagiellonian University Prof. Stanislawa Lojasiewicza 11 KrakówPL-30348 Poland

In recent years, nanostructures with hexagonal polytypes of gold have been synthesised, opening new possibilities in nanoscience and technology. As bulk gold crystallizes in the fcc phase, surface effects can play an important role in stabilizing hexagonal gold nanostructures. Here we investigate several hetero-structures with Ge substrate, including the fcc and hcp phases of gold that have been observed experimentally. We determine and discuss their interfacial energies and optimized atomic arrangements, comparing the theory results with available experimental data. Our DFT calculations for the Au-fcc(011)/Ge(001) junction show how the presence of defects in the interface layer can help to stabilize the atomic pattern consistent with microscopic images. Although the Au-hcp/Ge interface is characterized by similar interface energy, it reveals large atomic displacements due to significant mismatch. Finally, analyzing the electronic properties, we demonstrate that Au/Ge systems have metallic character but covalent-like bonding states between interfacial Ge and Au atoms are also present. © 2022, CC BY.

关键词： Density functional theory