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International Conference on Information and Computer Technologies (ICICT)

作者： Pranjal Ranjan Sarvesh Patil Faruk Kazi Center of Excellence in Complex and Nonlinear Dynamical Systems (CoE-CNDS) Veermata Jijabai Technological Institute Mumbai India

ISBN: (数字)9781728172835

ISBN: (纸本)9781728172842

Deep-Fakes are emerging as a significant threat to society, with potential to become weapons of mass disinformation and chaos. Simple tools provide ways to produce such digital forgeries at a large scale which makes it crucial to develop counter-attacking approaches for detection of these Deep-Learning based manipulations. This work analyzes a Transfer Learning based Convolutional Neural Network framework for the task of Deep-Fake Detection on three of the latest released datasets - DeepFakeDetection (DFD), Celeb-DF, and DeepFakeDetectionChallenge (DFDC) Preview. Additionally, a custom dataset of high-quality Deep-Fakes is compiled and used for evaluation of models. The intuition behind Transfer Learning for Deep-Fakes Detection is explored using the Explainable-AI technique of visualizing intermediate activations to provide interpretability. The critical problem of dataset shift and its effect on domain adaptation is explored by comparing cross-dataset test accuracies, with and without the usage of Transfer Learning. The results of this work indicate that even though Deep-Fake Detection is a highly domain specific task, there is a significant improvement in performance in terms of both single-domain classification accuracy and generalizability by utilizing Transfer Learning.

关键词： Videos Task analysis Feature extraction Visualization Training Forgery Transform coding

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Emergent Conformal Boundaries from Finite-Entanglement Scaling in Matrix Product States

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Physical Review Letters 2024年第8期132卷 086503-086503页

作者： Rui-Zhen Huang Long Zhang Andreas M. Läuchli Jutho Haegeman Frank Verstraete Laurens Vanderstraeten Department of Physics and Astronomy University of Ghent 9000 Ghent Belgium Kavli Institute for Theoretical Sciences and CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China Laboratory for Theoretical and Computational Physics Paul Scherrer Institute 5232 Villigen Switzerland Institute of Physics École Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland Department of Applied Mathematics and Theoretical Physics University of Cambridge Cambridge United Kingdom Center for Nonlinear Phenomena and Complex Systems Université Libre de Bruxelles Brussels Belgium

The use of finite entanglement scaling with matrix product states (MPS) has become a crucial tool for studying one-dimensional critical lattice theories, especially those with emergent conformal symmetry. We argue that finite entanglement introduces a relevant deformation in the critical theory. As a result, the bipartite entanglement Hamiltonian defined from the MPS can be understood as a boundary conformal field theory with a physical and an entanglement boundary. We are able to exploit the symmetry properties of the MPS to engineer the physical conformal boundary condition. The entanglement boundary, on the other hand, is related to the concrete lattice model and remains invariant under this relevant perturbation. Using critical lattice models described by the Ising, Potts, and free compact boson conformal field theories, we illustrate the influence of the symmetry and the relevant deformation on the conformal boundaries in the entanglement spectrum.

关键词： Critical phenomena Entanglement in field theory Quantum entanglement Quantum phase transitions Strongly correlated systems Conformal field theory Conformal symmetry Quantum spin chains

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Emergent conformal boundaries from finite-entanglement scaling in matrix product states

arXiv

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arXiv 2023年

作者： Huang, Rui-Zhen Zhang, Long Läuchli, Andreas M. Haegeman, Jutho Verstraete, Frank Vanderstraeten, Laurens Department of Physics and Astronomy University of Ghent Belgium Kavli Institute for Theoretical Sciences CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing100190 China Laboratory for Theoretical and Computational Physics Paul Scherrer Institute Villigen Switzerland Lausanne Switzerland Department of Applied Mathematics and Theoretical Physics University of Cambridge United Kingdom Center for Nonlinear Phenomena and Complex Systems Université Libre de Bruxelles Belgium

The use of finite entanglement scaling with matrix product states (MPS) has become a crucial tool for studying one-dimensional critical lattice theories, especially those with emergent conformal symmetry. We argue that finite entanglement introduces a relevant deformation in the critical theory. As a result, the bipartite entanglement Hamiltonian defined from the MPS can be understood as a boundary conformal field theory with a physical and an entanglement boundary. We are able to exploit the symmetry properties of the MPS to engineer the physical conformal boundary condition. The entanglement boundary, on the other hand, is related to the concrete lattice model and remains invariant under this relevant perturbation. Using critical lattice models described by the Ising, Potts, and free compact boson CFTs, we illustrate the influence of the symmetry and the relevant deformation on the conformal boundaries in the entanglement spectrum. Copyright © 2023, The Authors. All rights reserved.

关键词： Lattice theory

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Attacker behaviour profiling using stochastic ensemble of hidden markov models

arXiv

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arXiv 2019年

作者： Deshmukh, Soham Rade, Rahul Kazi, Faruk Centre of Excellence in Complex and Nonlinear Dynamical Systems VJTI

Cyber threat intelligence is one of the emerging areas of focus in information security. Much of the recent work has focused on rule-based methods and detection of network attacks using Intrusion Detection algorithms. In this paper, we propose a framework for inspecting and modelling the behavioural aspect of an attacker to obtain better insight predictive power on his future actions. For modelling, we propose a novel semi-supervised algorithm called Fusion Hidden Markov Model (FHMM) which is more robust to noise, requires comparatively less training time, and utilizes the benefits of ensemble learning to better model temporal relationships in data. This paper evaluates the performance of FHMM and compares it with both traditional algorithms like Markov Chain, Hidden Markov Model (HMM) and recently developed Deep Recurrent Neural Network (Deep RNN) architectures. We conduct the experiments on a dataset consisting of real data attacks on a Cowrie honeypot system. FHMM provides accuracy comparable to deep RNN architectures at significant lower training time. Given these experimental results, we recommend using FHMM for modelling discrete temporal data for significantly faster training and better performance than existing methods. Copyright © 2019, The Authors. All rights reserved.

关键词： Hidden Markov models

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Disorder-protected quantum state transmission through helical coupled-resonator waveguides

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Photonics Research 2020年第10期8卷 I0019-I0028页

作者： JUNG YUN HAN ANDREY ASUKHORUKOV DANIEL LEYKAM Center for Theoretical Physics of Complex Systems Institute for Basic ScienceDaejeon 34126South Korea Basic Science Program University of Science and TechnologyDasjeon 34113South Korea ARC Centre of Excellence for Transiormative Meta-Optical Systerms(TMOS) Nonlinear Physics CentreResearch School of PhysicsThe Australan Natiornal urnivershtyCanberraACT 2601Australia

We predict the preservation of temporal indistinguishability of photons propagating through helical coupled-resonator optical waveguides(H-CROWs).H-CROWs exhibit a pseudospin-momentum locked dispersion,which we show suppresscs on-site disorder-induced backscattering and group velocity *** simulate numerically the propagation of two-photon wave packets,demonstrating that they exhibit almost perfect Hong-Ou-Mandel dip visibility and then can preserve their quantum coherence even in the presence of moderate disorder,in contrast with regular CROws,which are highly sensitive to *** indistinguishability is the most fundamental resource of quantum information processing,H-CROWs may find applications for the implementation of robust optical links and delay lines in the emerging quantum photonic communication and computational platforms.

关键词： resonator waveguides quantum

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Entropy-driven impurity-induced nematic-isotropic transition of liquid crystals

arXiv

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arXiv 2019年

作者： Jana, Pritam Kumar Lam, Julien Parveen, Nagma Alava, Mikko J. Laurson, Lasse COMP Centre of Excellence Department of Applied Physics Aalto University Espoo Finland Center for Nonlinear Phenomena and Complex Systems Universite Libre de Bruxelles Brussels1050 Belgium Laboratory for Photochemistry and Spectroscopy Department of Chemistry KU Leuven Leuven Belgium Computational Physics Laboratory Tampere University P.O. Box 692 TampereFI-33014 Finland

Phase behavior of liquid crystals is of long-standing interest due to numerous applications, with one of the key issues being how the presence of impurities affects the liquid crystalline order. Here we study the orientational order of 4-cyano-40-pentylbiphenyl (5CB) and 4-cyano-40-hexylbiphenyl (6CB) nematic liquid crystals in the presence of varying concentrations of water and n-hexane molecules serving as impurities, by carrying out both fully atomistic simulations and experiments. Our results reveal that mixing of the impurities (in case of hexane) with the host liquid crystals causes a nematic-to-isotropic phase transition with hexane concentration as the control parameter while demixing (in case of water) results in only weak impurity-induced perturbations to the nematic liquid-crystalline order. We develop a coarse-grained model illustrating the general nature and entropic origin of the mixing-induced phase transition. Copyright © 2019, The Authors. All rights reserved.

关键词： Hexane

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Irreversible transition of amorphous and polycrystalline colloidal solids under cyclic deformation

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Physical Review E 2018年第6期98卷 062607-062607页

作者： Pritam Kumar Jana Mikko J. Alava Stefano Zapperi COMP Centre of Excellence Department of Applied Physics Aalto University P.O. Box 11100 FI-00076 Aalto Espoo Finland Université Libre de Bruxelles (ULB) Interdisciplinary Center for Nonlinear Phenomena and Complex Systems Campus Plaine CP 231 Blvd. du Triomphe B-1050 Brussels Belgium Center for Complexity and Biosystems Department of Physics University of Milano via Celoria 16 20133 Milano Italy CNR-ICMATE Via R. Cozzi 53 20125 Milano Italy

Cyclic loading on granular packings and amorphous media leads to a transition from reversible elastic behavior to an irreversible plasticity. In the present study, we investigate the effect of oscillatory shear on polycrystalline and amorphous colloidal solids by performing molecular dynamics simulations. Our results show that close to the transition, both systems exhibit enhanced particle mobility, hysteresis, and rheological loss of rigidity. However, the rheological response shows a sharper transition in the case of the polycrystalline sample as compared to the amorphous solid. In the polycrystalline system, we see the disappearance of disclinations, which leads to the formation of a monocrystalline system, whereas the amorphous system hardly shows any ordering. After the threshold strain amplitude, as we increase the strain amplitude both systems get fluid. In addition to that, particle displacements are more homogeneous in the case of polycrystalline systems as compared to the amorphous solid, mainly when the strain amplitude is larger than the threshold value. We do not see any effect of oscillation frequency on the reversible-irreversible transition.

关键词： Phase transitions Plastic deformation Polycrystals Colloidal glass Colloids Molecular dynamics

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Semiconducting 2D-materials: Nano-sandbox for fundamental physics and new platform for optical coatings, light emission and quantum light sources

Semiconducting 2D-materials: Nano-sandbox for fundamental ph...

引用

Optical Interference Coatings, OIC 2019

作者： Knopf, Heiko Lundt, Nils Bucher, Tobias Mupparapu, Rajeshkumar Löchner, Franz George, Antony Neumann, Christof Fasold, Stefan Sedov, Evgeny Waldherr, Max Klaas, Martin Tongay, Sefaating Klembt, Sebastian Chong, Katie Choi, Duk-Yong Taniguchip, Takashi Watanabe, Kenji Schulz, Ulrike Kavokin, Alexey Höfling, Sven Turchanin, Andrey Pertsch, Thomas Schneider, Christian Setzpfandt, Frank Staude, Isabelle Eilenberger, Falk Institute of Applied Physics Abbe Center of Photonics Friedrich Schiller University Albert-Einstein-Straße 15 Jena07745 Germany Fraunhofer Institute of Applied Optics and Precision Engineering IOF Center of Excellence in Photonics Albert-Einstein-Straße 7 Jena07745 Germany Max Planck School of Photonics Germany Technische Physik and Wilhelm-Conrad-Röntgen-Research Center for Complex Material Systems Universität Würzburg Würzburg Am HublandD-97074 Germany Institute of Physical Chemistry Friedrich Schiller University Jena Jena07743 Germany School of Physics and Astronomy University of Southampton Highfield SouthamptonSO171BJ United Kingdom Vladimir State University named after A.G. and N.G. Stoletovs Gorky str. 87 Vladimir600000 Russia School for Engineering of Matter Transport and Energy Arizona State University TempeAZ85287 United States Nonlinear Physics Centre Research School of Physics and Engineering Australian National University CanberraACT2601 Australia Laser Physics Centre Research School of Physics and Engineering Australian National University CanberraACT2601 Australia PNational Institute for Materials Science Tsukuba Ibaraki305-0044 Japan Westlake University 18 Shilongshan Road Hangzhou Zhejiang Province310024 China Institute of Natural Sciences Westlake Institute for Advanced Study 18 Shilongshan Road Hangzhou Zhejiang Province310024 China SUPA School of Physics and Astronomy University of St. Andrews St. AndrewsKY 16 9SS United Kingdom

ISBN: (纸本)9781943580583

Two-dimensional (2D) materials are interesting candidates for usage in optical coatings. The offer a natural access for the control of coating geometries down to the atomic scale. The set of 2D-materials, which is available for optical applications, spans dielectrics, semiconductors and (semi-)metals;but with sometimes vastly different properties from their bulk counterparts. In this talk I will present functionalized optical coatings consisting of 2D-materials but also functionalized optical coatings embedded with 2D-materials. I will discuss their specific properties, focusing on the development of excitonic systems and on highly nonlinear optical coatings for wavelength conversion and quantum light sources. © OSA 2019 © 2019 The Author(s)

关键词： Light sources

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Nonresonant spin selection methods and polarization control in exciton-polariton condensates

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Physical Review B 2019年第11期99卷 115303-115303页

作者： M. Klaas O. A. Egorov T. C. H. Liew A. Nalitov V. Marković H. Suchomel T. H. Harder S. Betzold E. A. Ostrovskaya A. Kavokin S. Klembt S. Höfling C. Schneider Technische Physik Wilhelm-Conrad-Röntgen-Research Center for Complex Material Systems Universität at Würzburg Am Hubland D-97074 Würzburg Germany Institute of Condensed Matter Theory and Optics Friedrich-Schiller-Universität Jena Max-Wien-Platz 1 D-07743 Jena Germany Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore School of Physics and Astronomy University of Southampton Southampton SO17 1BJ United Kingdom Science Institute University of Iceland Dunhagi 3 IS-107 Reykjavik Iceland ITMO University St. Petersburg 197101 Russia ARC Centre of Excellence in Future Low-Energy Electronics Technologies and Nonlinear Physics Centre Research School of Physics and Engineering The Australian National University Canberra ACT 2601 Australia Westlake University 18 Shilongshan Road Hangzhou 310024 Zhejiang Province China Institute of Natural Sciences Westlake Institute for Advanced Study 18 Shilongshan Road Hangzhou 310024 Zhejiang Province China SUPA School of Physics and Astronomy University of St Andrews St Andrews KY16 9SS United Kingdom

Bosonic condensates of exciton-polaritons are characterized by a well-defined pseudospin, which makes them attractive for quantum information schemes and spintronic applications, as well as the exploration of synthetic spin-orbit coupling. However, precise polarization control of coherent polariton condensates under nonresonant injection, the most important ingredient for such advanced studies, still remains a core challenge. Here, we address this problem and demonstrate unprecedented control of the pseudospin of an exciton-polariton condensate. The ultrafast stimulated scattering process allows the observation of completely spin-polarized condensates under highly nonresonant, circularly polarized excitation. This conservation of spin population translates, in the case of linearly polarized excitation, into an elliptically polarized emission. The degree of ellipticity can be controlled by varying the exciton-photon detuning and condensate density. Additionally, cavity engineering allows us to generate completely linearly polarized condensates with a deterministically chosen orientation. Our findings are of fundamental importance for the engineering and design of polaritonic devices that harness the spinor degree of freedom, such as chiral lasers, spin switches, and polaritonic topological insulator circuits.

关键词： Exciton polariton Spin polarization Polariton condensate Semiconductor microcavities Polarization Cavity resonators Optical absorption spectroscopy Photoluminescence

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THE TROJAN-PROOF CHIP

引用

IEEE SPECTRUM 2015年第2期52卷 46-51页

作者： Mitra, Subhasish Wong, H. -S. Philip Wong, Simon VJTI Center of Excellence in Complex and Non-linear Dynamical Systems Mumbai

Long ago, the story goes, Greek soldiers tried for 10 years to conquer the city of Troy. Eventually, they departed, leaving behind a large wooden horse, apparently as a gift. The Trojans pulled the beautiful tribute inside. Later, a group of Greek soldiers slipped out of the horse and opened the gates for their compatriots, who easily sacked the sleeping city. [ABSTRACT FROM PUBLISHER]

关键词： TROJAN horses (Computer viruses) COMPUTER software COMPUTER security INTEGRATED circuits COMPUTER viruses

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