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laser-damage Attack Against Optical Attenuators in Quantum Key distribution

Physical Review Applied 2020年第3期13卷 034017-034017页

作者： Anqi Huang Ruoping li Vladimir Egorov Serguei Tchouragoulov Krtin Kumar Vadim Makarov Institute for Quantum Information & State Key Laboratory of High Performance Computing College of Computer National University of Defense Technology Changsha 410073 People’s Republic of China Institute for Quantum Computing University of Waterloo Waterloo Ontario N2L 3G1 Canada Department of Electrical and Computer Engineering University of Waterloo Waterloo Ontario N2L 3G1 Canada Department of Physics and Astronomy University of Waterloo Waterloo Ontario N2L 3G1 Canada Faculty of Photonics and Optical Information ITMO University 199034 Kadetskaya line 3b St. Petersburg Russia QGLex Incorporated 105 Schneider Road Suite 111 Ottawa Ontario K2K 1Y3 Canada Russian Quantum Center Skolkovo Moscow 121205 Russia Shanghai Branch National Laboratory for Physical Sciences at Microscale and CAS Center for Excellence in Quantum Information University of Science and Technology of China Shanghai 201315 People’s Republic of China NTI Center for Quantum Communications National University of Science and Technology MISiS Moscow 119049 Russia

Many quantum key distribution systems employ a laser followed by an optical attenuator to prepare weak coherent states in the source. Their mean photon number must be precalibrated to guarantee the security of key distribution. Here we experimentally show that this calibration can be broken with a high-power laser attack. We test four fiber-optic attenuator types used in quantum key distribution systems, and find that two of them exhibit a permanent decrease in attenuation after laser damage. This results in higher mean photon numbers in the prepared states and may allow an eavesdropper to compromise the key.

关键词： light-matter interaction Photon statistics Photonics Quantum communication Quantum cryptography Quantum optics devices Fiber lasers

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deep learning methods for lung cancer segmentation in whole-slide histopathology images - The ACdC@lungHP challenge 2019

arXiv

引用

arXiv 2020年

作者： li, Zhang Zhang, Jiehua Tan, Tao Teng, Xichao Sun, Xiaoliang li, Yang liu, lihong Xiao, Yang lee, Byungjae li, Yilong Zhang, Qianni Sun, Shujiao Zheng, Yushan Yan, Junyu li, Ni Hong, Yiyu Ko, Junsu Jung, Hyun liu, Yanling Chen, Yu-Cheng Wang, Ching-Wei Yurovskiy, Vladimir Maevskikh, Pavel Khanagha, Vahid Jiang, Yi Feng, Xiangjun liu, Zhihong li, daiqiang Schüffler, Peter J. Yu, Qifeng Chen, Hui Tang, Yuling litjens, Geert College of Aerospace Science and Engineering National University of Defense Technology Changsha410073 China Department of Mathematics and Computer Science Eindhoven University of Technology Netherlands and ScreenPoint Medical Eindhoven Nijmegen5600 MB Netherlands Pingan Technology Shenzhen China Lunit Inc. Seoul Korea Republic of School of Electrical Engineering and Computer Science Queen Mary University of London London United Kingdom Image Processing Center School of Astronautics Beihang University Beijing102206 China Beijing Advanced Innovation Center for Biomedical Engineering Beijing100191 China Beijing Advanced Innovation Center for Biomedical Engineering Beihang University Image Processing Center School of Astronautics Beihang University Beijing102206 China AstLab School of Automatationm Beihang University Beijing China Department of R&D Center Arontier Co. Ltd. Seoul Korea Republic of Frederick National Laboratory United States Center of Computer Vision and Medical Imaging Graduate Institute of Biomedical Engineering Graduate institute of Applied Science and Technology National Taiwan University of Science and Technology AI Explore Taipei Taiwan Research Department Sky-chain Global Yekaterinburg Russia Audio Solutions Team Motorola Solutions Inc. PlantationFL United States Second Xiangya Hospital Central South University Changsha China Hunan Biotechnology Ltd. Changsha China Hunan Cancer Hospital Central South University Changsha China Memorial Sloan Kettering Cancer Center United States First Hospital of Changsha City Changsha China Radboud University Medical Center Nijmegen Netherlands

Accurate segmentation of lung cancer in pathology slides is a critical step in improving patient care. We proposed the ACdC@lungHP (Automatic Cancer detection and Classification in Whole-slide lung Histopathology) challenge for evaluating different computer-aided diagnosis (CAds) methods on the automatic diagnosis of lung cancer. The ACdC@lungHP 2019 focused on segmentation (pixel-wise detection) of cancer tissue in whole slide imaging (WSI), using an annotated dataset of 150 training images and 50 test images from 200 patients. This paper reviews this challenge and summarizes the top 10 submitted methods for lung cancer segmentation. All methods were evaluated using the false positive rate, false negative rate, and dICE coefficient (dC). The dC ranged from 0.7354±0.1149 to 0.8372±0.0858. The dC of the best method was close to the inter-observer agreement (0.8398±0.0890). All methods were based on deep learning and categorized into two groups: multi-model method and single model method. In general, multi-model methods were significantly better (p Copyright © 2020, The Authors. All rights reserved.

关键词： Biological organs

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Anomaly detection for Network Connection logs

arXiv

引用

arXiv 2018年

作者： Mehta, Swapneel Kothuri, Prasanth Garcia, daniel lanza Dept. Of Computer Engineering D. J. Sanghvi College of Engineering Mumbai India IT-DB Group European Organisation for Nuclear Research Geneva Switzerland

We leverage a streaming architecture based on ElK, Spark and Hadoop in order to collect, store, and analyse database connection logs in near real-time. The proposed system investigates outliers using unsupervised learning;widely adopted clustering and classification algorithms for log data, highlighting the subtle variances in each model by visualisation of outliers. Arriving at a novel solution to evaluate untagged, unfiltered connection logs, we propose an approach that can be extrapolated to a generalised system of analysing connection logs across a large infrastructure comprising thousands of individual nodes and generating hundreds of lines in logs per second. Copyright © 2018, The Authors. All rights reserved.

关键词： Statistics

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A magnetic massive star has experienced a stellar merger

arXiv

引用

arXiv 2024年

作者： Frost, A.J. Sana, H. Mahy, l. Wade, G. Barron, J. le Bouquin, J.-B. Mérand, A. Schneider, F.R.N. Shenar, T. Barbá, R.H. Bowman, d.M. Fabry, M. Farhang, A. Marchant, P. Morrell, N.I. Smoker, J.V. Institute of Astronomy KU Leuven Leuven3001 Belgium European Southern Observatory Santiago Chile Royal Observatory of Belgium BrusselsB-1180 Belgium Department of Physics & Space Science Royal Military College of Canada Ontario KingstonK7K 0C6 Canada Department of Physics Engineering & Astronomy Queen’s University Ontario KingstonK7L 3N6 Canada Université Grenoble Alpes Centre national de la Recherche Scientifique Institut de Planétologie et d’Astrophysique de Grenoble GrenobleF-38000 France European Southern Observatory Headquarters Garching bei München85748 Germany Heidelberger Institut für Theoretische Studien Heidelberg69118 Germany Astronomisches Rechen-Institut Zentrum für Astronomie der Universität Heidelberg Heidelberg69120 Germany The School of Physics and Astronomy Tel Aviv University Tel Aviv69978 Israel Departamento de Física y Astronomía Universidad de la Serena La Serena Chile School of Mathematics Statistics and Physics Newcastle University Newcastle upon TyneNE1 7RU United Kingdom School of Astronomy Institute for Research in Fundamental Sciences Tehran19395–5531 Iran Las Campanas Observatory Carnegie Observatories La Serena Chile UK Astronomy Technology Centre Royal Observatory EdinburghEH9 3HJ United Kingdom

Massive stars (those ≥8 solar masses at formation) have radiative envelopes that cannot sustain a dynamo, the mechanism which produces magnetic fields in lower mass stars. despite this, ∼7% of massive stars have observed magnetic fields, the origin of which is debated. We use multi-epoch interferometric and spectroscopic observations to characterise Hd 148937, a binary system of two massive stars, finding that only one star is magnetic and that it appears younger than its companion. The system properties and a surrounding bipolar nebula can be reproduced by a model where two stars merged (in a previous triple system) to produce the magnetic massive star. Our results provide observational evidence that magnetic fields form in at least some massive stars through stellar mergers. Copyright © 2024, The Authors. All rights reserved.

关键词： Magnetic fields

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The AlMA REBElS Survey: discovery of a massive, highly star-forming and morphologically complex UlIRG at z = 7.31

arXiv

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arXiv 2023年

作者： Hygate, A.P.S. Hodge, J.A. da Cunha, E. Rybak, M. Schouws, S. Inami, H. Stefanon, M. Graziani, l. Schneider, R. dayal, P. Bouwens, R.J. Smit, R. Bowler, R.A.A. Endsley, R. Gonzalez, V. Oesch, P.A. Stark, d.P. Algera, H.S.B. Aravena, M. Barrufet, l. Ferrara, A. Fudamoto, Y. Hilhorst, J.H.A. de looze, I. Nanayakkara, T. Pallottini, A. Riechers, d.A. Sommovigo, l. Topping, M.W. van der Werf, P. Leiden Observatory Leiden University P.O. Box 9513 Leiden2300 RA Netherlands International Centre for Radio Astronomy Research University of Western Australia 35 Stirling Hwy Crawley26WA 6009 Australia 2601 Australia Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology Delft Netherlands Hiroshima Astrophysical Science Center Hiroshima University 1-3-1 Kagamiyama Higashi-Hiroshima Hiroshima739-8526 Japan Departament d’Astronomia i Astrofísica Universitat de València C. Dr. Moliner 50 Burjassot ValènciaE-46100 Spain Dipartimento di Fisica Sapienza Università di Roma Piazzale Aldo Moro 5 RomaI-00185 Italy INAF Osservatorio Astrofisico di Arcetri Largo E. Fermi 5 FirenzeI-50125 Italy Sapienza School for Advanced Studies Viale Regina Elena 291 RomaI-00161 Italy INAF/Osservatorio Astronomico di Roma via Frascati 33 Monte Porzio Catone RomaI-00078 Italy Istituto Nazionale di Fisica Nucleare Sezione di Roma1 Piazzale Aldo Moro 2 RomaI-00185 Italy Jodrell Bank Centre for Astrophysics Department of Physics and Astronomy School of Natural Sciences The University of Manchester ManchesterM13 9PL United Kingdom Steward Observatory University of Arizona 933 N Cherry Ave TucsonAZ85721 United States Departmento de Astronomia Universidad de Chile Casilla 36-D Santiago7591245 Chile Camino del Observatorio 1515 Las Condes Santiago7591245 Chile Observatoire de Genève VersoixCH-1290 Switzerland Niels Bohr Institute University of Copenhagen Jagtvej 128 København NDK-2200 Denmark National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo Japan Nucleo de Astronomia Facultad de Ingenieria y Ciencias Universidad Diego Portales Av. Ejercito 441 Santiago Chile Scuola Normale Superiore Piazza dei Cavalieri 7 PisaI- 50126 Italy Waseda Research Institute for Science and Engineering Faculty of Science and Engineering Waseda University 3-4-1 Okubo Shinjuku Tokyo169-8555 Japan Sterrenkun

We present Atacama large Millimeter/Submillimeter Array (AlMA) [Cii] and ∼ 158μm continuum observations of REBElS-25, a massive, morphologically complex ultra-luminous infrared galaxy (UlIRG;lIR = 1.5+−00.85 × 1012 l) at z = 7.31, spectroscopically confirmed by the Reionization Era Bright Emission line Survey (REBElS) AlMA large Programme. REBElS-25 has a significant stellar mass of M∗ = 8+−42 × 109 M . From dust-continuum and ultraviolet observations, we determine a total obscured + unobscured star formation rate of SFR = 199+−10163 M yr−1. This is about four times the SFR estimated from an extrapolated main-sequence. We also infer a [Cii]-based molecular gas mass of MH2 = 5.1+−52.16 × 1010 M, implying a molecular gas depletion time of tdepl,H2 = 0.3+−00.32 Gyr. We observe a [Cii] velocity gradient consistent with disc rotation, but given the current resolution we cannot rule out a more complex velocity structure such as a merger. The spectrum exhibits excess [Cii] emission at large positive velocities (∼ 500 km s−1), which we interpret as either a merging companion or an outflow. In the outflow scenario, we derive a lower limit of the mass outflow rate of 200 M yr−1, which is consistent with expectations for a star formation-driven outflow. Given its large stellar mass, SFR and molecular gas reservoir ∼ 700 Myr after the Big Bang, we explore the future evolution of REBElS-25. Considering a simple, conservative model assuming an exponentially declining star formation history, constant star formation efficiency, and no additional gas inflow, we find that REBElS-25 has the potential to evolve into a galaxy consistent with the properties of high-mass quiescent galaxies recently observed at z ∼ 4. Copyright © 2023, The Authors. All rights reserved.

关键词： Galaxies

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A Particle Swarm Optimization Strategy using QSAR modeling on the Second generation Neural Network

A Particle Swarm Optimization Strategy using QSAR modeling o...

引用

International Conference on Advances in Computing, Communication Control and Networking

作者： Humera Parveen Vikash Yadav Amit Gupta Yogesh Sharma Department of Computer Science & Engineering G L Bajaj Institute of Technology & Management Greater Noida India ABES Engineering College Ghaziabad India >Dr. APJ Abdul Kalam Technical University Lucknow India ITS Engineering College Greater Noida

ISBN: (纸本)9781538641200

QSAR (Quantitative Structure-Activity Relationship) demonstrating is one of the all-around created zones in sedate improvement through computational chemistry and computational biology. diverse properties or practices of compound particles have been explored in the field of QSAR, This sort of connection between sub-atomic structure and change in organic movement is focal point of center for QSAR displaying. Artificial neural network based calculations are essential instruments for QSAR investigation, subsequently;they are coordinated into the medication generation process. In this paper we will attempt to gesso through the issue of taking in the Second generation neural networks (2dNN/CVNNs) utilizing Particle Swarm Optimization (PSO);which is one of the open themes in the machine learning computing environment where the two dimensional/Complex valued neural network (2dNN/CVNN) is a more entangled for complex-esteemed information handling in two dimensional space (also called the 2dNN) because of a considerable measure of imperatives, for example, enactment work must be limited and differentiable at the total complex environment. In the proposed study, a 2dNN show for genuine esteemed relapse issues s exhibited. We tried such prepared CVNN on two QSAR datasets as a true benchmark issue. The outcomes demonstrate that the forecast and speculation capacities of CVNNs are better in correlation than the traditional real valued neural systems (1dNN/RVNNs). Also, merging of CVNNs is substantially speedier than that of RVNNs in a large portion of the case.

关键词： Second generation neural network (2dNN/CVNN) drug design Split type activation function Quantitative structure-Activity relationship (QSAR) Particle swarm optimization (PSO)

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First directional Measurement of Sub-MeV Solar Neutrinos with Borexino

引用

Physical Review letters 2022年第9期128卷 091803-091803页

作者： M. Agostini K. Altenmüller S. Appel V. Atroshchenko Z. Bagdasarian d. Basilico G. Bellini J. Benziger R. Biondi d. Bravo B. Caccianiga F. Calaprice A. Caminata P. Cavalcante A. Chepurnov d. d’Angelo S. davini A. derbin A. di Giacinto V. di Marcello X. F. ding A. di ludovico l. di Noto I. drachnev A. Formozov d. Franco C. Galbiati C. Ghiano M. Giammarchi A. Goretti A. S. Göttel M. Gromov d. Guffanti Aldo Ianni Andrea Ianni A. Jany d. Jeschke V. Kobychev G. Korga S. Kumaran M. laubenstein E. litvinovich P. lombardi I. lomskaya l. ludhova G. lukyanchenko l. lukyanchenko I. Machulin J. Martyn E. Meroni M. Meyer l. Miramonti M. Misiaszek V. Muratova B. Neumair M. Nieslony R. Nugmanov l. Oberauer V. Orekhov F. Ortica M. Pallavicini l. Papp l. Pelicci Ö. Penek l. Pietrofaccia N. Pilipenko A. Pocar G. Raikov M. T. Ranalli G. Ranucci A. Razeto A. Re M. Redchuk A. Romani N. Rossi S. Schönert d. Semenov G. Settanta M. Skorokhvatov A. Singhal O. Smirnov A. Sotnikov Y. Suvorov R. Tartaglia G. Testera J. Thurn E. Unzhakov A. Vishneva R. B. Vogelaar F. von Feilitzsch A. Wessel M. Wojcik B. Wonsak M. Wurm S. Zavatarelli K. Zuber G. Zuzel Department of Physics and Astronomy University College London London WC1E 6BT United Kingdom Physik-Department Technische Universität München 85748 Garching Germany National Research Centre Kurchatov Institute 123182 Moscow Russia Institut für Kernphysik Forschungszentrum Jülich 52425 Jülich Germany Dipartimento di Fisica Università degli Studi e INFN 20133 Milano Italy Chemical Engineering Department Princeton University Princeton New Jersey 08544 USA INFN Laboratori Nazionali del Gran Sasso 67010 Assergi (AQ) Italy Physics Department Princeton University Princeton New Jersey 08544 USA Dipartimento di Fisica Università degli Studi e INFN 16146 Genova Italy Physics Department Virginia Polytechnic Institute and State University Blacksburg Virginia 24061 USA Lomonosov Moscow State University Skobeltsyn Institute of Nuclear Physics 119234 Moscow Russia St. Petersburg Nuclear Physics Institute NRC Kurchatov Institute 188350 Gatchina Russia Joint Institute for Nuclear Research 141980 Dubna Russia APC Université de Paris CNRS Astroparticule et Cosmologie Paris F-75013 France Gran Sasso Science Institute 67100 L’Aquila Italy M. Smoluchowski Institute of Physics Jagiellonian University 30348 Krakow Poland III. Physikalisches Institut B RWTH Aachen University 52062 Aachen Germany Institute of Physics and Cluster of Excellence PRISMA+ Johannes Gutenberg-Universität Mainz 55099 Mainz Germany Institute for Nuclear Research of NAS Ukraine 03028 Kyiv Ukraine Department of Physics School of Engineering Physical and Mathematical Sciences Royal Holloway University of London Egham TW20 OEX United Kingdom Institute of Nuclear Research (Atomki) 4026 Debrecen Hungary National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) 115409 Moscow Russia Department of Physics Technische Universität Dresden 01062 Dresden Germany Dipartimento di Chimica Biologia e Biotecnologie Università degli Studi e INFN 06123 Perugia Italy Amherst Center for Fu

We report the measurement of sub-MeV solar neutrinos through the use of their associated Cherenkov radiation, performed with the Borexino detector at the laboratori Nazionali del Gran Sasso. The measurement is achieved using a novel technique that correlates individual photon hits of events to the known position of the Sun. In an energy window between 0.54 to 0.74 MeV, selected using the dominant scintillation light, we have measured 10 887−2103+2386(stat)±947(syst) (68% confidence interval) solar neutrinos out of 19 904 total events. This corresponds to a Be7 neutrino interaction rate of 51.6−12.5+13.9 counts/(day·100 ton), which is in agreement with the standard solar model predictions and the previous spectroscopic results of Borexino. The no-neutrino hypothesis can be excluded with >5σ confidence level. For the first time, we have demonstrated the possibility of utilizing the directional Cherenkov information for sub-MeV solar neutrinos, in a large-scale, high light yield liquid scintillator detector. This measurement provides an experimental proof of principle for future hybrid event reconstruction using both Cherenkov and scintillation signatures simultaneously.

关键词： Neutrinos Cherenkov detectors Neutrino detectors Particle data analysis Scintillators

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Chiral plasmons with twisted atomic bilayers

arXiv

引用

arXiv 2020年

作者： lin, Xiao liu, Zifei Stauber, Tobias Gómez-Santos, Guillermo Gao, Fei Chen, Hongsheng Zhang, Baile low, Tony Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation ZJU-Hangzhou Global Science and Technology Innovation Center College of Information Science and Electronic Engineering Zhejiang University Hangzhou310027 China Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore637371 Singapore Materials Science Factory Instituto de Ciencia de Materiales de Madrid CSIC MadridE-28049 Spain Institute for Theoretical Physics University of Regensburg RegensburgD-93040 Germany Universidad Autónoma de Madrid MadridE-28049 Spain Centre for Disruptive Photonic Technologies NTU Singapore637371 Singapore Department of Electrical and Computer Engineering University of Minnesota MinneapolisMN55455 United States

Van der Waals heterostructures of atomically thin layers with rotational misalignments, such as twisted bilayer graphene, feature interesting structural moirésuperlattices. due to the quantum coupling between the twisted atomic layers, light-matter interaction is inherently chiral;as such, they provide a promising platform for chiral plasmons in the extreme nanoscale. However, while the interlayer quantum coupling can be significant, its influence on chiral plasmons still remains elusive. Here we present the general solutions from full Maxwell equations of chiral plasmons in twisted atomic bilayers, with the consideration of interlayer quantum coupling. We find twisted atomic bilayers have a direct correspondence to the chiral metasurface, which simultaneously possesses chiral and magnetic surface conductivities, besides the common electric surface conductivity. In other words, the interlayer quantum coupling in twisted van der Waals heterostructures may facilitate the construction of various (e.g., bi-anisotropic) atomically-thin metasurfaces. Moreover, the chiral surface conductivity, determined by the interlayer quantum coupling, determines the existence of chiral plasmons and leads to a unique phase relationship (i.e., ±π/2 phase difference) between their TE and TM wave components. Importantly, such a unique phase relationship for chiral plasmons can be exploited to construct the missing longitudinal spin of plasmons, besides the common transverse spin of plasmons. Copyright © 2020, The Authors. All rights reserved.

关键词： Plasmons

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Identifying the Areas of Project Management Competences and Resources, Capabilities Facilitating Agility development

引用

IOP Conference Series: Materials Science and engineering 2020年第2期981卷

作者： Kafila M. Rajyalaxmi J. Bhavana K M Sujatha R. VijayaSrinivas Department of Business S R University Warangal Department of Business Management S R Engineering College Warangal Department of Computer Science S R University Warangal Sumathi Reddy Institute of Technology for Women Warangal India K L U Business School K L University Guntur

Nowadays, along with the development of innovations, market setups are changing and also changing at an effortless cost challenging, thereby, ventures. Many ventures are finding themselves in exceptionally inconstant markets as well as additionally experience the demand for re-conceptualizing their market techniques. While markets come to be unstable, the concentration of business is placed much more above premium, price, circulation, and additional development all at once. The last is encountered not clear business shapes, which improve all of them in the direction of finding the most effective suitable exits if you would like to survive in a challenging temperature. This paper identifies the areas of project management competences and resources, capabilities facilitating agility development.

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Combinatorial Alphabet-dependent Bounds for locally Recoverable Codes

Combinatorial Alphabet-Dependent Bounds for Locally Recovera...

引用

作者： Agarwal, Abhishek Barg, Alexander Hu, Sihuang Mazumdar, Arya Tamo, Itzhak College of Information and Computer Sciences University of Massachusetts-Amherst AmherstMA United States Department of ECE University of Maryland College ParkMD United States Lehrstuhl D für Mathematik RWTH Aachen Aachen Germany Department of Electrical Engineering - Systems Tel Aviv University Tel Aviv Israel

locally recoverable (lRC) codes have recently been a focus point of research in coding theory due to their theoretical appeal and applications in distributed storage systems. In an lRC code, any erased symbol of a codeword can be recovered by accessing only a small number of other symbols. For lRC codes over a small alphabet (such as binary), the optimal rate-distance trade-off is unknown. We present several new combinatorial bounds on lRC codes including the locality-aware sphere packing and Plotkin bounds. We also develop an approach to linear programming (lP) bounds on lRC codes. The resulting lP bound gives better estimates in examples than the other upper bounds known in the literature. Further, we provide the tightest known upper bound on the rate of linear lRC codes with a given relative distance, an improvement over the previous best known bounds. © 1963-2012 IEEE.

关键词： linear programming

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