检索结果-内蒙古大学图书馆

Efficient Verification of Continuous-Variable Quantum States and Devices without Assuming Identical and Independent Operations

学校读者我要写书评

暂无评论

Physical Review Letters 2021年第24期126卷 240503-240503页

作者： Ya-Dong Wu Ge Bai Giulio Chiribella Nana Liu QICI Quantum Information and Computation Initiative Department of Computer Science The University of Hong Kong Pokfulam Road Hong Kong The University of Hong Kong Shenzhen Institute of Research and Innovation 5/F Key Laboratory Platform Building No. 6 Yuexing 2nd Road Nanshan Shenzhen 518057 China Department of Computer Science Parks Road Oxford OX1 3QD United Kingdom Perimeter Institute for Theoretical Physics Waterloo Ontario N2L 2Y5 Canada Institute of Natural Sciences Shanghai Jiao Tong University Shanghai 200240 China Ministry of Education Key Laboratory in Scientific and Engineering Computing Shanghai Jiao Tong University Shanghai 200240 China University of Michigan-Shanghai Jiao Tong University Joint Institute Shanghai 200240 China

Continuous-variable quantum information, encoded into infinite-dimensional quantum systems, is a promising platform for the realization of many quantum information protocols, including quantum computation, quantum metrology, quantum cryptography, and quantum communication. To successfully demonstrate these protocols, an essential step is the certification of multimode continuous-variable quantum states and quantum devices. This problem is well studied under the assumption that multiple uses of the same device result in identical and independently distributed (i.i.d.) operations. However, in realistic scenarios, identical and independent state preparation and calls to the quantum devices cannot be generally guaranteed. Important instances include adversarial scenarios and instances of time-dependent and correlated noise. In this Letter, we propose the first set of reliable protocols for verifying multimode continuous-variable entangled states and devices in these non-i.i.d scenarios. Although not fully universal, these protocols are applicable to Gaussian quantum states, non-Gaussian hypergraph states, as well as amplification, attenuation, and purification of noisy coherent states.

关键词： Quantum benchmarking Quantum cryptography Quantum information processing with continuous variables

Multipliers correction methods for optimization problems over the stiefel manifold

学校读者我要写书评

暂无评论

arXiv 2020年

作者： Wang, Lei Gao, Bin Liu, Xin State Key Laboratory of Scientific and Engineering Computing Academy of Mathematics and Systems Science Chinese Academy of Sciences University of Chinese Academy of Sciences China Institute of Information and Communication Technologies Electronics and Applied Mathematics Uni-versité catholique de Louvain Belgium ICTEAM institute UCLouvain Belgium

We propose a class of multipliers correction methods to minimize a differentiable function over the Stiefel manifold. The proposed methods combine a function value reduction step with a proximal correction step. The former one searches along an arbitrary descent direction in the Euclidean space instead of a vector in the tangent space of the Stiefel manifold. Meanwhile, the latter one minimizes a first-order proximal approximation of the objective function in the range space of the current iterate to make Lagrangian multipliers associated with orthogonality constraints symmetric at any accumulation point. The global convergence has been established for the proposed methods. Preliminary numerical experiments demonstrate that the new methods significantly outperform other state-of-the-art first-order approaches in solving various kinds of testing problems. Copyright © 2020, The Authors. All rights reserved.

关键词： Lagrange multipliers

Light Cone Distribution Amplitude for the Λ Baryon from Lattice QCD

学校读者我要写书评

暂无评论

arXiv 2024年

作者： Chu, Min-Huan Bai, Haoyang Hua, Jun Liang, Jian Ji, Xiangdong Schäfer, Andreas Su, Yushan Wang, Wei Yang, Yi-Bo Zeng, Jun Zhang, Jian-Hui Zhang, Qi-An Shanghai Key Laboratory for Particle Physics and Cosmology School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Yang Yuanqing Scientific Computering Center Tsung-Dao Lee Institute Shanghai Jiao Tong University Shanghai200240 China Faculty of Physics Adam Mickiewicz University ul. Uniwersytetu Poznańskiego 2 Poznań61-614 Poland Institute of High Energy Physics CAS Beijing100049 China School of Physics University of Chinese Academy of Sciences Beijing100049 China Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter Institute of Quantum Matter South China Normal University Guangzhou510006 China Guangdong-Hong Kong Joint Laboratory of Quantum Matter Guangdong Provincial Key Laboratory of Nuclear Science Southern Nuclear Science Computing Center South China Normal University Guangzhou510006 China Department of Physics University of Maryland College ParkMD20742 United States Institut für Theoretische Physik Universität Regensburg RegensburgD-93040 Germany Institute of Modern Physics Chinese Academy of Sciences Guangdong Province Huizhou516000 China CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing100190 China School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced Study UCAS Hangzhou 310024 China International Centre for Theoretical Physics Asia-Pacific Hangzhou Beijing China School of Physical Sciences University of Chinese Academy of Sciences Beijing100049 China School of Science and Engineering The Chinese University of Hong Kong Shenzhen518172 China School of Physics Beihang University Beijing102206 China

We calculate the leading-twist light-cone distribution amplitudes of the light Λ baryon using lattice methods within the framework of large momentum effective theory. Our numerical computations are conducted employing Nf = 2 + 1 stout smeared clover fermions and a Symanzik gauge action on a lattice with spacing a = 0.077 fm, and a pion mass of 303 MeV. To approach the large momentum regime, we simulate the equal-time correlations with the hadron momentum Pz = {2.52,3.02,3.52} GeV. By investigating the potential analytic characteristics of the baryon quasi-distribution amplitude in coordinate space, we validate these findings through our lattice calculations. After renormalization and extrapolation, we present results for the three-dimensional distribution of momentum fractions for the two light quarks. Based on these findings the paper briefly discusses the phenomenological impact on weak decays of Λb, and outlines potential systematic uncertainties that can be improved in the future. This work lays the theoretical foundation for accessing baryon LCDAs from lattice QCD. Copyright © 2024, The Authors. All rights reserved.

关键词： Momentum

Lattice Boltzmann simulations of melting in a rectangular cavity heated locally from below at high Rayleigh number

学校读者我要写书评

暂无评论

arXiv 2019年

作者： Zhao, Yong Wu, Yao Chai, Zhenhua Shi, Baochang Hubei Key Laboratory of Engineering Modeling and Scientific Computing School of Mathematics and Statistics Huazhong University of Science and Technology Wuhan430074 China

This work presented a block triple-relaxation-time (B-TriRT) lattice Boltzmann model for simulating melting in a rectangular cavity heated from below at high Rayleigh (Ra) number (Ra = 108). The test of benchmark problem show that present B-TriRT can dramatically reduce the numerical diffusion across the phase interface. In addition, the influences of location of the heated region are investigated. The results indicate that the location of heated region plays an essential role in melting rate and the full melting occur earliest when the heated region is located at the middle region. Copyright © 2019, The Authors. All rights reserved.

关键词： Melting

3D-CariGAN: An end-to-end solution to 3D caricature generation from normal face photos

学校读者我要写书评

暂无评论

arXiv 2020年

作者： Ye, Zipeng Xia, Mengfei Sun, Yanan Yi, Ran Yu, Minjing Zhang, Juyong Lai, Yu-Kun Liu, Yong-Jin BNRist MOE-Key Laboratory of Pervasive Computing The Department of Computer Science and Technology Tsinghua University Beijing China The Department of Computer Science and Engineering Shanghai Jiao Tong University Shanghai China The College of Intelligence and Computing Tianjin University China The School of Mathematical Sciences University of Science and Technology of China China School of Computer Science and Informatics Cardiff University United Kingdom

Caricature is a type of artistic style of human faces that attracts considerable attention in the entertainment industry. So far a few 3D caricature generation methods exist and all of them require some caricature information (e.g., a caricature sketch or 2D caricature) as input. This kind of input, however, is difficult to provide by non-professional users. In this paper, we propose an end-to-end deep neural network model that generates high-quality 3D caricatures directly from a normal 2D face photo. The most challenging issue for our system is that the source domain of face photos (characterized by normal 2D faces) is significantly different from the target domain of 3D caricatures (characterized by 3D exaggerated face shapes and textures). To address this challenge, we: (1) build a large dataset of 5,343 3D caricature meshes and use it to establish a PCA model in the 3D caricature shape space;(2) reconstruct a normal full 3D head from the input face photo and use its PCA representation in the 3D caricature shape space to establish correspondences between the input photo and 3D caricature shape;and (3) propose a novel character loss and a novel caricature loss based on previous psychological studies on caricatures. Experiments including a novel two-level user study show that our system can generate high-quality 3D caricatures directly from normal face photos. Copyright © 2020, The Authors. All rights reserved.

关键词： Large dataset

The error self-compensation effect in the broadband monitoring of multiband filters

学校读者我要写书评

暂无评论

The error self-compensation effect in the broadband monitori...

Optical Interference Coatings, OIC 2019

作者： Ji, Xiaochuan Zhang, Jinlong Cheng, Xinbin Wang, Zhanshan Matvienko, Ivan Isaev, Temur Tikhonravov, Alexander MOE Key Laboratory of Advanced Micro-Structured Materials Shanghai200092 China Institute of Precision Optical Engineering School of Physics Science and Engineering Tongji University Shanghai200092 China Moscow121205 Russia Department of Physics Moscow State University Moscow119991 Russia Research Computing Center Moscow State University Moscow119991 Russia

The paper investigates production of the multiband filter by broadband monitoring. A special 4-line filter was designed and the simulation demonstrated the layer thickness errors self-compensation effect that was quit... 详细信息

ISBN: (纸本)9781943580583

关键词： Error compensation

Many-body Hilbert space scarring on a superconducting processor

学校读者我要写书评

暂无评论

arXiv 2022年

作者： Zhang, Pengfei Dong, Hang Gao, Yu Zhao, Liangtian Hao, Jie Desaules, Jean-Yves Guo, Qiujiang Chen, Jiachen Deng, Jinfeng Liu, Bobo Ren, Wenhui Yao, Yunyan Zhang, Xu Xu, Shibo Wang, Ke Jin, Feitong Zhu, Xuhao Zhang, Bing Li, Hekang Song, Chao Wang, Zhen Liu, Fangli Papić, Zlatko Ying, Lei Wang, H. Lai, Ying-Cheng Department of Physics ZJU-Hangzhou Global Scientific and Technological Innovation Center Interdisciplinary Center for Quantum Information Zhejiang Province Key Laboratory of Quantum Technology and Device Zhejiang University Hangzhou310027 China Institute of Automation Chinese Academy of Sciences Beijing100190 China School of Physics and Astronomy University of Leeds LeedsLS2 9JT United Kingdom Alibaba-Zhejiang University Joint Research Institute of Frontier Technologies Hangzhou310027 China QuEra Computing Inc. BostonMA02135 United States School of Electrical Computer and Energy Engineering Department of Physics Arizona State University TempeAZ85287 United States

Quantum many-body scarring (QMBS) – a recently discovered form of weak ergodicity breaking in strongly-interacting quantum systems – presents opportunities for mitigating thermalization-induced decoherence in quantum information processsing. However, the existing experimental realizations of QMBS are based on kinetically-constrained systems where an emergent dynamical symmetry "shields" such states from the thermalizing bulk of the spectrum. Here, we experimentally realize a distinct kind of QMBS phenomena by approximately decoupling a part of the many-body Hilbert space in the computational basis. Utilizing a programmable superconducting processor with 30 qubits and tunable couplings, we realize Hilbert space scarring in a non-constrained model in different geometries, including a linear chain as well as a quasi-one-dimensional comb geometry. By performing full quantum state tomography on 4-qubit subsystems, we provide strong evidence for QMBS states by measuring qubit population dynamics, quantum fidelity and entanglement entropy following a quench from initial product states. Our experimental findings broaden the realm of QMBS mechanisms and pave the way to exploiting correlations in QMBS states for applications in quantum information technology. Copyright © 2022, The Authors. All rights reserved.

关键词： Vector spaces

Harmonized-Multinational qEEG norms (HarMNqEEG)

学校读者我要写书评

暂无评论

NEUROIMAGE 2022年 256卷 119190-119190页

作者： Li, Min Wang, Ying Lopez-Naranjo, Carlos Hu, Shiang Reyes, Ronaldo Cesar Garcia Paz-Linares, Deirel Areces-Gonzalez, Ariosky Hamid, Aini Ismafairus Abd Evans, Alan C. Savostyanov, Alexander N. Calzada-Reyes, Ana Villringer, Arno Tobon-Quintero, Carlos A. Garcia-Agustin, Daysi Yao, Dezhong Dong, Li Aubert-Vazquez, Eduardo Reza, Faruque Razzaq, Fuleah Abdul Omar, Hazim Abdullah, Jafri Malin Galler, Janina R. Ochoa-Gomez, John F. Prichep, Leslie S. Galan-Garcia, Lidice Morales-Chacon, Lilia Valdes-Sosa, Mitchell J. Trondle, Marius Zulkifly, Mohd Faizal Mohd Rahman, Muhammad Riddha Bin Abdul Milakhina, Natalya S. Langer, Nicolas Rudych, Pavel Koenig, Thomas Virues-Alba, Trinidad A. Lei, Xu Bringas-Vega, Maria L. Bosch-Bayard, Jorge F. Valdes-Sosa, Pedro Antonio [a]The Clinical Hospital of Chengdu Brain Science Institute MOE Key Lab for Neuroinformation School of Life Science and Technology University of Electronic Science and Technology of China Chengdu China [b]Cuban Center for Neurocience La Habana Cuba [c]McGill Centre for Integrative Neuroscience Ludmer Centre for Neuroinformatics and Mental Health Montreal Neurological Institute Canada [d]Department of Neurosciences School of Medical Sciences Universiti Sains Malaysia Universiti Sains Malaysia Health Campus Kota Bharu Kelantan 16150 Malaysia [e]Brain and Behaviour Cluster School of Medical Sciences Universiti Sains Malaysia Health Campus Kota Bharu Kelantan 16150 Malaysia [f]Hospital Universiti Sains Malaysia Universiti Sains Malaysia Health Campus Kota Bharu Kelantan 16150 Malaysia [g]Humanitarian Institute Novosibirsk State University Novosibirsk 630090 Russia [h]Laboratory of Psychophysiology of Individual Differences Federal State Budgetary Scientific Institution Scientific Research Institute of Neurosciences and Medicine Novosibirsk 630117 Russia [i]Laboratory of Psychological Genetics at the Institute of Cytology and Genetics Siberian Branch of the Russian Academy of Sciences Novosibirsk 630090 Russia [j]University of Pinar del Río “Hermanos Saiz Montes de Oca” Pinar del Río Cuba [k]Department of Neurology Max Planck Institute for Human Cognitive and Brain Sciences Leipzig Germany [l]Department of Cognitive Neurology University Hospital Leipzig Leipzig Germany [m]Center for Stroke Research Charité-Universitätsmedizin Berlin Berlin Germany [n]Grupo Neuropsicología y Conducta - GRUNECO Faculty of Medicine Universidad de Antioquia Colombia [o]Research Department Institución Prestadora de Servicios de Salud IPS Universitaria Colombia [p]The Cuban center aging longevity and health Havana Cuba [q]Research Unit of NeuroInformation Chinese Academy of Medical Sciences Chengdu 2019RU035 China [r]School of Electrical Engineering Zhengzhou University Zhengzhou 4500

This paper extends frequency domain quantitative electroencephalography (qEEG) methods pursuing higher sensitivity to detect Brain Developmental Disorders. Prior qEEG work lacked integration of cross-spectral information omitting important functional connectivity descriptors. Lack of geographical diversity precluded accounting for site-specific variance, increasing qEEG nuisance variance. We ameliorate these weaknesses. (i) Create lifespan Riemannian multinational qEEG norms for cross-spectral tensors. These norms result from the HarMNqEEG project fostered by the Global Brain Consortium. We calculate the norms with data from 9 countries, 12 devices, and 14 studies, including 1564 subjects. Instead of raw data, only anonymized metadata and EEG cross spectral tensors were shared. After visual and automatic quality control, developmental equations for the mean and standard deviation of qEEG traditional and Riemannian DPs were calculated using additive mixed-effects models. We demonstrate qEEG "batch effects " and provide methods to calculate harmonized z-scores. (ii) We also show that harmonized Riemannian norms produce z-scores with increased diagnostic accuracy predicting brain dysfunction produced by malnutrition in the first year of life and detecting COVID induced brain dysfunction. (iii) We offer open code and data to calculate different individual z-scores from the HarMNqEEG dataset. These results contribute to developing bias-free, low-cost neuroimaging technologies applicable in various health settings.

关键词： Quantitative EEG EEG cross-spectrum Riemannian geometry Batch effects Z-score Harmonization Malnutrition Covid induced brain dysfunction Developmental Brain Chart

Titelbild: Cyclooctatetraene-Embedded Carbon Nanorings (Angew. Chem. 22/2024)

学校读者我要写书评

暂无评论

Angewandte Chemie 2024年第22期136卷

作者： Sheng-Nan Lei Ling Zhu Ning Xue Xuedong Xiao Le Shi Duan-Chao Wang Zhe Liu Xin-Ru Guan Yuan Xie Ke Liu Lian-Rui Hu Zhaohui Wang J. Fraser Stoddart Qing-Hui Guo Stoddart Institute of Molecular Science Department of Chemistry Zhejiang University Hangzhou 310027 China ZJU-Hangzhou Global Scientific and Technological Innovation Center Hangzhou 311215 China Shanghai Key Laboratory of Green Chemistry and Chemical Processes Shanghai Frontiers Science Center of Molecule Intelligent Syntheses School of Chemistry and Molecular Engineering East China Normal University Shanghai 200062 China Key Laboratory of Organic Optoelectronics and Molecular Engineering Department of Chemistry Tsinghua University Beijing 100084 China Chong Yuet Ming Chemistry Building The University of Hong Kong Hong Kong SAR Simpson Querrey Institute for BioNanotechnology 303 East Superior Street Chicago IL-60611 USA School of Chemistry University of New South Wales Sydney NSW-2052 Australia MOE Key Laboratory of Bioorganic Phosphorous and Chemical Biology Department of Chemistry Tsinghua University Beijing 100084 China