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arXiv 2024年

作者： Zhong, Changchun Li, Fangxin Meesala, Srujan Wood, Steven Lake, David Painter, Oskar Jiang, Liang Department of Physics Xi’an Jiaotong University Shanxi Xi’an710049 China Department of Physics University of Chicago ChicagoIL60637 United States Institute for Quantum Information and Matter California Institute of Technology PasadenaCA91125 United States Kavli Nanoscience Institute and Thomas J. Watson Sr. Laboratory of Applied Physics California Institute of Technology PasadenaCA91125 United States Center for Quantum Computing Amazon Web Services PasadenaCA91125 United States Pritzker School of Molecular Engineering University of Chicago ChicagoIL60637 United States

Entangling microwave and optical photons is one of the promising ways to realize quantum transduction through quantum teleportation. This paper investigates the entanglement of microwave-optical photon pairs generated from an electro-optomechanical system driven by a blue-detuned pulsed Gaussian pump. The photon pairs are obtained through weak parametric-down-conversion, and their temporal correlation is revealed by the second-order correlation function. We then study the discrete variable entanglement encoded in the time bin degree of freedom, where entanglement is identified by Bell inequality violation. Furthermore, we estimate the laser-induced heating and show that the pulse-pumped system features lower heating effects while maintaining a reasonable coincidence photon counting rate. © 2024, CC BY.

关键词： Quantum entanglement

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MPTA-Net: Multi-Scale Perception Network with Triple-View Attention for Polyp Segmentation

MPTA-Net: Multi-Scale Perception Network with Triple-View At...

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Neural Networks, Information and Communication Engineering (NNICE), International Conference on

作者： Zhihong Chen Lisha Yao Yue Liu Bingjiang Qiu Chu Han Haoyang Tang Yujia Du Zaiyi Liu Gang Fang Institute of Computing Science and Technology Guangzhou University Guangzhou China Guangdong Provincial Key Laboratory of Artificial Intelligence in Medical Image Analysis and Application Guangzhou China School of Medicine South China University of Technology Guangzhou China Department of Radiology Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences) Southern Medical University Guangzhou China School of Information Engineering Jiangxi College of Applied Technology Ganzhou China Guangdong Cardiovascular Institute Guangdong Provincial People’s Hospital Guangdong Academy of Sciences Guangzhou China Medical Research Institute Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences) Southern Medical University Guangzhou China Faculty of Information Engineering and Automation Kunming University of Science and Technology Kunming China

Accurate segmentation of polyps in endoscopic images is pivotal for the early detection and diagnosis of colorectal cancer (CRC). Nonetheless, the varied appearance of polyp foregrounds and the intricate background interference significantly diminish the efficacy of pixel-level predictions. To address this issue, we propose a multi-scale perception network with triple-view attention (MPTA-Net) for polyp segmentation. The model primarily revolves around two core principles. The first integrates multiscale spatial information into the network's hierarchical encoding process to better preserve detailed polyp semantic information. The second introduces a triple-view attention mechanism that analyzes feature maps from three distinct perspectives to focus on and localize semantically relevant areas, thereby enhancing segmentation accuracy. Experimental results reveal that the proposed model outperforms existing mainstream segmentation models, effectively addressing under-segmentation, over-segmentation, and edge blurriness issues in polyp segmentation, thereby achieving better identification of challenging areas.

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Existence of periodic and S-asymptotically periodic solutions to fractional diffusion equations with analytic semigroups

Existence of periodic and S-asymptotically periodic solution...

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作者： Mu, Jia Nan, Jiecuo Zhou, Yong Key Laboratory of China's Ethnic Languages and Information Technology of Ministry Northwest Minzu University Lanzhou730000 China School of Mathematics and Computer Science Northwest Minzu University Lanzhou730000 China Key Laboratory of Streaming Data Computing Technologies and Application Northwest Minzu University Lanzhou730000 China School of Mathematics and Computer Science Xiangtan University Hunan411105 China Nonlinear Analysis and Applied Mathematics Research Group Faculty of Science King Abdulaziz University Jeddah21589 Saudi Arabia

In this paper, we study periodic and S-asymptotically periodic solutions for fractional diffusion equations (FDE). As we all know, there is no exact periodic solution to differential equations with Caputo or Riemann-Liouville fractional derivatives. Even so, in this paper, periodic (S-asymptotically periodic) mild or classical solutions for FDE with Weyl-Liouville fractional derivatives could be obtained in various fractional power spaces. In addition, a numerical simulation example and a specific example of fractional diffusion equation are given to verify the main theoretical results. © 2019 John Wiley & Sons, Ltd.

关键词： Diffusion

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Preparation of pseudo-pure states for NMR quantum computing with one ancillary qubit

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Science China(Physics,Mechanics & Astronomy) 2019年第6期62卷 13-20页

作者： Tao Xin Liang Hao Shi-Yao Hou Guan-Ru Feng Gui-Lu Long State Key Laboratory of Low-dimensional Quantum Physics and Department of Physics Tsinghua University Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Center for Quantum Computing Peng Cheng Laboratory Shenzhen Key Laboratory of Quantum Science and Engineering Southern University of Science and Technology Institute of Applied Physics and Computational Mathematics Center for Computational Sciences Sichuan Normal University College of Physics and Electronic Engineering Sichuan Normal University Institute for Quantum Computing Waterloo Tsinghua National Laboratory of Information Science and Technology The Innovative Center of Quantum Matter

Quantum state preparation plays an equally important role as quantum operations and measurements in quantum information processing. The previous methods for initialization require either an exponential number of experiments, or cause signal reduction or place restrictions on molecular structures. In this study, we propose three types of quantum circuits for preparing the pseudo-pure states of(n-1) qubits in the n-coupled Hilbert space, which simply needs the assistance of one ancilla spin and two different experiments independent of n. Most importantly, our methods work well on homo-nuclear and hetero-nuclear molecules without the reduction of signals in the gradient field. As a proof-of-principle demonstration, we experimentally prepared the pseudo-pure states of heteronuclear 2-qubit and homonuclear 4-qubit molecules using a nuclear magnetic resonance quantum information processor.

关键词： quantum state preparation nuclear magnetic resonance quantum algorithms

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Experimental computations of atomic properties on a superconducting quantum processor

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Physical Review A 2024年第6期110卷 062620-062620页

作者： Akhil Pratap Singh Kenji Sugisaki Srinivasa Prasannaa Bijaya Kumar Sahoo Bhanu Pratap Das Yasunobu Nakamura Department of Applied Physics Graduate School of Engineering The University of Tokyo Bunkyo-ku Tokyo 113-8656 Japan Present address: QCD Labs QTF Centre of Excellence Department of Applied Physics Aalto University P. O. Box 13500 FIN-00076 Aalto Finland. Graduate School of Science and Technology Keio University 7-1 Shinkawasaki Saiwai-ku Kawasaki Kanagawa 212-0032 Japan Quantum Computing Center Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama Kanagawa 223-8522 Japan Keio University Sustainable Quantum Artificial Intelligence Center (KSQAIC) Keio University 2-15-45 Mita Minato-ku Tokyo 108-8345 Japan Centre for Quantum Engineering Research and Education TCG CREST Sector V Salt Lake Kolkata 700091 India Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India Atomic Molecular and Optical Physics Division Physical Research Laboratory Navrangpura Ahmedabad 380009 India Department of Physics Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo 152-8550 Japan RIKEN Center for Quantum Computing (RQC) Wako Saitama 351-0198 Japan

We experimentally compute relativistic and correlation effects in the atomic properties by using a superconducting qubit processor. Specifically, we compute the relativistic ground-state energies and magnetic-dipole hyperfine structure constants for four Li-like atomic systems ranging from very light to moderately heavy to very heavy in terms of nuclear charge. A symmetry-conserving Bravyi-Kitaev transformation is used to reduce the original six-qubit problem to a four-qubit problem, which is experimentally contrived by reducing the hardware requirement by employing a virtual two-qubit gate. It enables the simulation of four-qubit circuits using two physical qubits with additional circuit evaluations. The ground-state wave functions, required for computing atomic properties, are obtained by using quantum state tomography. Our results show that the averaged relative errors for the ground-state energies are ≈0.3±1%. However, for the hyperfine structure constants, the mean values of the relative errors are less than 15%, with their estimated upper bound of relative errors of ≈±10% (with the exception of 7.2±47% for neutral Li7). Notably, our results for the hyperfine structure constants exhibit higher sensitivity to errors as compared to energies; a trend which we also confirm through additional numerical simulations.

关键词： Qubits

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A diffuse-interface lattice Boltzmann method for the dissolution through nonlinear heterogeneous reaction

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Physics of Fluids 2025年第5期37卷

作者： Yang, Xiaofeng Zhan, Chengjie Liu, Xi Chai, Zhenhua School of Mathematics and Statistics Huazhong University of Science and Technology Wuhan430074 China Institute of Interdisciplinary Research for Mathematics and Applied Science Huazhong University of Science and Technology Wuhan430074 China Hubei Key Laboratory of Engineering Modeling and Scientific Computing Huazhong University of Science and Technology Wuhan430074 China The State Key Laboratory of Intelligent Manufacturing Equipment and Technology Huazhong University of Science and Technology Wuhan430074 China

In this work, a diffuse-interface lattice Boltzmann method (DI-LBM) is proposed for the dissolution through nonlinear heterogeneous reaction. In this method, the sharp boundary between the fluid and solid phases is replaced by a diffuse interface with a nonzero thickness. To describe the changes of physical variables from the fluid region to the solid region, a smooth function is introduced, and simultaneously, the nonlinear Robin boundary condition imposed on the fluid-solid interface is reformulated as a source term into the modified convection-diffusion equation. We then test the DI-LBM through several benchmark problems, and find that the numerical results are in agreement with the analytical solutions and available data. Finally, the present DI-LBM is adopted to study the dissolution in a two-dimensional porous medium, and the results show that with the decrease in reaction order, the reactant in the central region with a large fluid velocity reacts faster and forms a conical pathway. © 2025 Author(s).

关键词： Kinetic theory of gases

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Learning consensus and complementary bipartite graph through orthogonal transformation for multi-view subspace clustering

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Expert Systems with Applications 2025年 286卷

作者： Li, Xiangli Wei, Jiafeng Xie, Tengchi School of Mathematics and Computing Science Guilin University of Electronic Technology Guangxi 541004 China Center for Applied Mathematics of Guangxi Guangxi 541004 China Guangxi Colleges and University Key Laboratory of Data Analysis and Computation Guangxi 541004 China

In order to effectively utilize the consensus and complementary information in multi-view data to achieve better clustering performance, a large number of multi-view clustering algorithms have been proposed. A common multi-view subspace clustering method for mining consensus information is to learn a uniform consensus representation matrix for multiple views. But there are currently studies questioning the rationality of this method. To address this issue, the research in this paper establishes a link between view-specific representation matrices and consensus representation matrices, making the learning of consensus representation matrices more reasonable. Specifically, this paper considers the vectors formed by the representation coefficients of the samples as embeddings of the sample features in the Rm linear space, after which a mapping relationship will be established between the view-specific representation matrices and the consensus representation matrices to learn reasonable consensus representation matrices. Extensive experiments on eight benchmark datasets show that the proposed algorithm is effective and competitive. © 2025 Elsevier Ltd

关键词： Clustering algorithms

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Demonstrating a long-coherence dual-rail erasure qubit using tunable transmons

arXiv

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arXiv 2023年

作者： Levine, H. Haim, A. Hung, J.S.C. Alidoust, N. Kalaee, M. DeLorenzo, L. Wollack, E.A. Arrangoiz-Arriola, P. Khalajhedayati, A. Sanil, R. Moradinejad, H. Vaknin, Y. Kubica, A. Hover, D. Aghaeimeibodi, S. Alcid, J.A. Baek, C. Barnett, J. Bawdekar, K. Bienias, P. Carson, H.A. Chen, C. Chen, L. Chinkezian, H. Chisholm, E.M. Clifford, A. Cosmic, R. Crisosto, N. Dalzell, A.M. Davis, E. D’Ewart, J.M. Diez, S. D’Souza, N. Dumitrescu, P.T. Elkhouly, E. Fang, M.T. Fang, Y. Flammia, S. Fling, M.J. Garcia, G. Gharzai, M.K. Gorshkov, A.V. Gray, M.J. Grimberg, S. Grimsmo, A.L. Hann, C.T. He, Y. Heidel, S. Howell, S. Hunt, M. Iverson, J. Jarrige, I. Jiang, L. Jones, W.M. Karabalin, R. Karalekas, P.J. Keller, A.J. Lasi, D. Lee, M. Ly, V. MacCabe, G. Mahuli, N. Marcaud, G. Matheny, M.H. McArdle, S. McCabe, G. Merton, G. Miles, C. Milsted, A. Mishra, A. Moncelsi, L. Naghiloo, M. Noh, K. Oblepias, E. Ortuno, G. Owens, J.C. Pagdilao, J. Panduro, A. Paquette, J.-P. Patel, R.N. Peairs, G. Perello, D.J. Peterson, E.C. Ponte, S. Putterman, H. Refael, G. Reinhold, P. Resnick, R. Reyna, O.A. Rodriguez, R. Rose, J. Rubin, A.H. Runyan, M. Ryan, C.A. Sahmoud, A. Scaffidi, T. Shah, B. Siavoshi, S. Sivarajah, P. Skogland, T. Su, C.-J. Swenson, L.J. Sylvia, J. Teo, S.M. Tomada, A. Torlai, G. Wistrom, M. Zhang, K. Zuk, I. Clerk, A.A. Brandão, F.G.S.L. Retzker, A. Painter, O. AWS Center for Quantum Computing PasadenaCA91125 United States Institute of Applied Physics The Hebrew University of Jerusalem Givat Ram Jerusalem91904 Israel Racah Institute of Physics The Hebrew University of Jerusalem Givat Ram Jerusalem91904 Israel Centre for Engineered Quantum Systems School of Physics The University of Sydney SydneyNSW2006 Australia Pritzker School of Molecular Engineering University of Chicago ChicagoIL60637 United States Institute for Quantum Information and Matter California Institute of Technology PasadenaCA91125 United States Department of Physics California Institute of Technology PasadenaCA91125 United States Laboratory of Applied Physics Kavli Nanoscience Institute California Institute of Technology PasadenaCA91125 United States

Quantum error correction with erasure qubits promises significant advantages over standard error correction due to favorable thresholds for erasure errors. To realize this advantage in practice requires a qubit for which nearly all errors are such erasure errors, and the ability to check for erasure errors without dephasing the qubit. We demonstrate that a "dual-rail qubit" consisting of a pair of resonantly coupled transmons can form a highly coherent erasure qubit, where transmon T1 errors are converted into erasure errors and residual dephasing is strongly suppressed, leading to millisecond-scale coherence within the qubit subspace. We show that single-qubit gates are limited primarily by erasure errors, with erasure probability perasure = 2.19(2) × 10−3 per gate while the residual errors are ∼ 40 times lower. We further demonstrate mid-circuit detection of erasure errors while introducing Copyright © 2023, The Authors. All rights reserved.

关键词： Qubits

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Quality Optimization of Live Streaming Services over HTTP with Reinforcement Learning

Quality Optimization of Live Streaming Services over HTTP wi...

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2021 IEEE Global Communications Conference (GLOBECOM)

作者： F. Tashtarian R. Falanji A. Bentaleb A. Erfanian P. S. Mashhadi C. Timmerer H. Hellwagner R. Zimmermann Christian Doppler Laboratory ATHENA Institute of Information Technology Alpen-Adria-Universität Klagenfurt Austria Sharif University of Technology Tehran Iran School of Computing National University of Singapore (NUS) Center for Applied Intelligent Systems Research (CAISR) Halmstad University Sweden

ISBN: (纸本)9781728181059

Recent years have seen tremendous growth in HTTP adaptive live video traffic over the Internet. In the presence of highly dynamic network conditions and diverse request patterns, existing yet simple hand-crafted heuristic approaches for serving client requests at the network edge might incur a large overhead and significant increase in time complexity. Therefore, these approaches might fail in delivering acceptable Quality of Experience (QoE) to end users. To bridge this gap, we propose ROPL, a learning-based client request management solution at the edge that leverages the power of the recent breakthroughs in deep reinforcement learning, to serve requests of concurrent users joining various HTTP-based live video channels. ROPL is able to react quickly to any changes in the environment, performing accurate decisions to serve clients requests, which results in achieving satisfactory user QoE. We validate the efficiency of ROPL through trace-driven simulations and a real-world setup. Experimental results from real-world scenarios confirm that ROPL outperforms existing heuristic-based approaches in terms of QoE, with a factor up to $3.7\times$ .

关键词： Scalability Conferences Reinforcement learning Streaming media Internet Quality of experience Servers

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Preparing for HPC on RISC-V: Examining Vectorization and Distributed Performance of an Astrophysics Application with HPX and Kokkos

Preparing for HPC on RISC-V: Examining Vectorization and Dis...

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High Performance computing, Networking, Storage and Analysis, SC-W: Workshops of the International Conference for

作者： Patrick Diehl Panagiotis Syskakis Gregor Daiß Steven R. Brandt Alireza Kheirkhahan Srinivas Yadav Singanaboina Dominic Marcello Chris Taylor John Leidel Hartmut Kaiser Applied Computer Science (CCS-7) Los Alamos National Laboratory Los Alamos NM U.S.A. Department of Physics and Astronomy Louisiana State University Baton Rouge LA U.S.A. LSU Center for Computation & Technology Louisiana State University Baton Rouge LA U.S.A. IPVS University of Stuttgart Stuttgart Germany Tactical Computing Labs Lindsay TX U.S.A. Department of Computer Science Louisiana State University Baton Rouge LA U.S.A.

ISBN: (数字)9798350355543

ISBN: (纸本)9798350355550

In recent years, interest in RISC-V computing architectures has moved from academic to mainstream, especially in the field of High Performance computing where energy limitations are increasingly a concern. As of this year, the first single board RISC-V CPUs implementing the finalized ratified vector specification are being released. The RISC-V vector specification follows in the tradition of vector processors found in the CDC STAR-100, the Cray-1, the Convex C-Series, and the NEC SX machines and accelerators. The family of vector processors offers support for variable-length array processing as opposed to the fixed-length processing functionality offered by SIMD. Vector processors offer opportunities to perform vector-chaining which allows temporary results to be used without the need to resolve memory *** this work, we use the Octo-Tiger multi-physics, multi-scale, 3D adaptive mesh refinement astrophysics application to study these early RISC-V chips with vector machine support. We report on our experience in porting this modern C++ code (which is built upon several open-source libraries such as HPX and Kokkos) to RISC-V. In addition, we show the impact of the RISC-V Vector extension on a RISC-V single board computer by implementing the std :: experimental:simd interface and integrating it with our code. We also compare the application’s performance, scalability, and power consumption on desktop-grade RISC-V computer to an A64FX *** results presented in this paper are part of a longer-term evaluation of RISC-V’s viability for HPC applications.

关键词： Power demand Astrophysics High performance computing Europe Computer architecture Hardware Vectors Supercomputers Libraries Vector processors

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