检索结果-内蒙古大学图书馆

arXiv 2022年

作者： Shen, Daozhi Yang, HeeBong Spudat, Christian Patel, Tarun Zhong, Shazhou Chen, Fangchu Yan, Jian Luo, Xuan Cheng, Meixin Sciaini, Germán Sun, Yuping Rhodes, Daniel A. Timusk, Thomas Zhou, Y. Norman Kim, Na Young Tsen, Adam W. Institute for Quantum Computing University of Waterloo WaterlooONN2L 3G1 Canada Department of Chemistry University of Waterloo WaterlooONN2L 3G1 Canada Centre for Advanced Materials Joining Department of Mechanical and Mechatronics Engineering University of Waterloo WaterlooONN2L 3G1 Canada Department of Electrical and Computer Engineering University of Waterloo WaterlooONN2L 3G1 Canada Institute of Electrodynamics Microwave and Circuit Engineering TU Wien Gusshausstrasse 25/354 Vienna1040 Austria Department of Physics and Astronomy University of Waterloo WaterlooONN2L 3G1 Canada Key Laboratory of Materials Physics Institute of Solid State Physics HFIPS Chinese Academy of Sciences Hefei230031 China University of Science and Technology of China Hefei230026 China Waterloo Institute for Nanotechnology University of Waterloo WaterlooONN2L 3G1 Canada Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory HFIPS Chinese Academy of Sciences Hefei230031 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China Department of Materials Science and Engineering University of Wisconsin MadisonWI United States Department of Physics and Astronomy McMaster University HamiltonONL8S 4M1 Canada

The ability to perform broadband optical spectroscopy with sub-diffraction-limit resolution is highly sought-after for a wide range of critical applications. However, sophisticated tip-enhanced techniques are currently required to achieve this goal. We bypass this challenge by demonstrating an extremely broadband photodetector based on a two-dimensional (2D) van der Waals heterostructure that is sensitive to light across over a decade in energy from the mid-infrared (MIR) to deep-ultraviolet (DUV) at room temperature. The devices feature high detectivity (> 109 cm Hz1/2 W-1) together with high bandwidth (2.1 MHz). The active area can be further miniaturized to submicron dimensions, far below the diffraction limit for the longest detectable wavelength of 4.1 µm, enabling such devices for facile measurements of local optical properties on atomic-layer-thickness samples placed in close proximity. This work can lead to the development of low-cost and high-throughput photosensors for hyperspectral imaging at the nanoscale. © 2022, CC BY.

关键词： Van der Waals forces

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Efficient Verification of Pure quantum States in the Adversarial Scenario

arXiv

引用

arXiv 2019年

作者： Zhu, Huangjun Hayashi, Masahito Department of Physics Center for Field Theory and Particle Physics Fudan University Shanghai200433 China State Key Laboratory of Surface Physics Fudan University Shanghai200433 China Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai200433 China Collaborative Innovation Center of Advanced Microstructures Nanjing210093 China Graduate School of Mathematics Nagoya University Nagoya464-8602 Japan Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China Centre for Quantum Technologies National University of Singapore 3 Science Drive 2 117542 Singapore

Efficient verification of pure quantum states in the adversarial scenario is crucial to many applications in quantum information processing, such as blind measurement-based quantum computation and quantum networks. However, little is known about this subject so far. Here we establish a general framework for verifying pure quantum states in the adversarial scenario and clarify the resource cost. Moreover, we propose a simple and general recipe to constructing efficient verification protocols for the adversarial scenario from protocols for the nonadversarial scenario. With this recipe, arbitrary pure states can be verified in the adversarial scenario with almost the same efficiency as in the nonadversarial scenario. Many important quantum states in quantum information processing can be verified in the adversarial scenario with unprecedented high efficiencies. Copyright © 2019, The Authors. All rights reserved.

关键词： quantum optics

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General framework for verifying pure quantum states in the adversarial scenario

arXiv

引用

arXiv 2019年

Bipartite and multipartite entangled states are of central interest in quantum information processing and foundational studies. Efficient verification of these states, especially in the adversarial scenario, is a key to various applications, including quantum computation, quantum simulation, and quantum networks. However, little is know about this topic in the adversarial scenario. Here we initiate a systematic study of pure-state verification in the adversarial scenario. In particular, we introduce a general method for determining the minimal number of tests required by a given strategy to achieve a given precision. In the case of homogeneous strategies, we can even derive an analytical formula. Furthermore, we propose a general recipe to verifying pure quantum states in the adversarial scenario by virtue of protocols for the nonadversarial scenario. Thanks to this recipe, the resource cost for verifying an arbitrary pure state in the adversarial scenario is comparable to the counterpart for the nonadversarial scenario, and the overhead is at most three times for high-precision verification. Our recipe can readily be applied to efficiently verify bipartite pure states, stabilizer states, hypergraph states, weighted graph states, and Dicke states in the adversarial scenario. This paper is an extended version of the companion paper [1]. Copyright © 2019, The Authors. All rights reserved.

关键词： quantum chemistry

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The REDTOP experiment: Rare η/η' Decays to Probe New Physics.

arXiv

引用

arXiv 2022年

作者： Elam, J. Mane, A. Comfort, J. Mauskopf, P. McFarland, D. Thomas, L. Pedraza, I. Leon, D. Escobar, S. Herrera, D. Silverio, D. Abdallah, W. Winn, D. Spannowsky, M. Dey, J. Di Benedetto, V. Dobrescu, B. Fagan, D. Gianfelice-Wendt, E. Hahn, E. Jensen, D. Johnstone, C. Johnstone, J. Kilmer, J. Kobilarcik, T. Kronfeld, A. Krempetz, K. Los, S. May, M. Mazzacane, A. Mokhov, N. Pellico, W. Pla-Dalmau, A. Pronskikh, V. Ramberg, E. Rauch, J. Ristori, L. Schmidt, E. Sellberg, G. Tassotto, G. Tsai, Y.D. Alqahtani, A. Shi, J. Gandhi, R. Homiller, S. Chen, X. Hu, Q. Passemar, E. Sánchez-Puertas, P. Roy, S. Gatto, C. Baldini, W. Carosi, R. Kievsky, A. Viviani, M. Krzemien, W. Silarski, M. Zielinski, M. Guadagnoli, D. Alves, D.S.M. González-Solís, S. Pastore, S. Berlowski, M. Blazey, G. Dychkant, A. Francis, K. Syphers, M. Zutshi, V. Chintalapati, P. Malla, T. Figora, M. Fletcher, T. Ismail, A. Egaña-Ugrinovic, D. Kahn, Y. McKeen, D. Meade, P. Gutierrez, A. Hernandez-Ruiz, M.A. Escribano, R. Masjuan, P. Royo, E. Kubis, B. Jaeckel, J. Marcucci, L.E. Siligardi, C. Barbi, S. Mugoni, C. Guida, M. Charlebois, S. Pratte, J.F. Harland-Lang, L. Berryman, J.M. Gardner, R. Paschos, P. Konisberg, J. Mills, C. Ye, Z. Murray, M. Rogan, C. Royon, C. Minafra, N. Novikov, A. Gautier, F. Isidori, T. Mills, C. Ye, Z. Gardner, S. Yan, X. Onel, Y. Pospelov, M. Batell, B. Freitas, A. Rai, M. Gao, D.N. Maamari, K. Kupsc, A. Fabela-Enriquez, B. Petrov, A. Tulin, S. Argonne National Laboratory United States Arizona State University United States Benemerita Universidad Autonoma de Puebla Mexico Department of Mathematics Faculty of Science Cairo University Giza Egypt Fairfield University United States Durham University United Kingdom Fermi National Accelerator Laboratory United States Georgetown University United States Guangdong Provincial Key Laboratory of Nuclear Science Institute of Quantum Matter South China Normal University Guangzhou510006 China Guangdong-Hong Kong Joint Laboratory of Quantum Matter Southern Nuclear Science Computing Center South China Normal University Guangzhou510006 China Harish-Chandra Research Institute HBNI Jhunsi India Harvard University CambridgeMA United States Institute of Modern Physics Chinese Academy of Sciences Lanzhou China Indiana University United States Institut de Física d'Altes Energies-Barcelona Spain Institute of Physics Sachivalaya Marg Sainik School Post Bhubaneswar India Istituto Nazionale di Fisica Nucleare-Sezione di Napoli Italy Northern Illinois University United States Istituto Nazionale di Fisica Nucleare-Sezione di Ferrara Italy Istituto Nazionale di Fisica Nucleare-Sezione di Pisa Italy Institute of Physics Jagiellonian University Krakow30-348 Poland Laboratoire d'Annecy-le-Vieux de Physique Théorique France Los Alamos National Laboratory United States National Centre for Nuclear Research Warsaw Poland Oklahoma State University United States Perimeter Institute for Theoretical Physics Waterloo Canada Princeton University Princeton United States TRIUMF Canada Stony Brook University New York United States Universidad Autonoma de Zacatecas Mexico Universitat Autónoma de Barcelona Spain Bethe Center for Theoretical Physics Germany Universität Heidelberg Germany Universita' di Pisa and INFN Italy Universita' di Modena e Reggio Emilia Italy Universita' di Salerno and INFN-Sezione di Napoli Italy Université de Sherbrooke Canada University of Oxford United Kingdo

The η and η' mesons are nearly unique in the particle universe since they are almost Goldstone bosons and the dynamics of their decays are strongly constrained. The integrated η-meson samples collected in earlier experiments amount to ∼ 109events. A new experiment, REDTOP (Rare Eta Decays To Observe Physics Beyond the Standard Model), is being proposed, with the intent of collecting a data sample of order 1014η (1012η') for studying very rare decays. Such statistics are sufficient for investigating several symmetry violations, and for searching for particles and fields beyond the Standard Model. In this work we present several studies evaluating REDTOP sensitivity to processes that couple the Standard Model to New Physics through all four of the so-called portals: the Vector, the Scalar, the Axion and the Heavy Lepton portal. The sensitivity of the experiment is also adequate for probing several conservation laws, in particular CP, T and Lepton Universality, and for the determination of the η form factors, which is crucial for the interpretation of the recent measurement of muon g-2. © 2022, CC BY.

关键词： Bosons

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Optimal verification and fidelity estimation of maximally entangled states

arXiv

引用

arXiv 2019年

We study the verification of maximally entangled states by virtue of the simplest measurement settings: local projective measurements without adaption. We show that optimal protocols are in one-to-one correspondence with complex projective 2-designs constructed from orthonormal bases. Optimal protocols with minimal measurement settings are in one-to-one correspondence with complete sets of mutually unbiased bases. Based on this observation, optimal protocols are constructed explicitly for any local dimension, which can also be applied to estimating the fidelity with the target state and to detecting entanglement. In addition, we show that incomplete sets of mutually unbiased bases are optimal for verifying maximally entangled states when the number of measurement settings is restricted. Moreover, we construct optimal protocols for the adversarial scenario in which state preparation is not trusted. The number of tests has the same scaling behavior as the counterpart for the nonadversarial scenario;the overhead is no more than three times. We also show that the entanglement of the maximally entangled state can be certified with any given significance level using only one test as long as the local dimension is large enough. Copyright © 2019, The Authors. All rights reserved.

关键词： quantum entanglement

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Comment on Nahimovs et al. ‘On the probability of finding marked connected components using quantum walks’

arXiv

引用

arXiv 2019年

作者： Glos, Adam Nahimovs, Nikolay Institute of Theoretical and Applied Informatics Polish Academy of Sciences ul. Baltycka 5 Gliwice44-100 Poland Institute of Informatics Silesian University of Technology ul. Akademicka 16 Gliwice44-100 Poland Centre for Quantum Computer Science Faculty of Computing University of Latvia Riga Latvia

In this comment paper we present two misconceptions found in paper of Nahimovs et al. On the probability of finding marked connected components using quantum walks. First, we show that the Theorem 2 (sufficient and necessary condition for a state to be stationary) is incomplete – it works only if unmarked vertices form a single connected component. Second, we correct derivation of a coefficient in the Theorem 3 (lower bound on the probability) and show how to upper bound value of a. Copyright © 2019, The Authors. All rights reserved.

关键词： Probability

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Simulations of subatomic many-body physics on a quantum frequency processor

引用

Physical Review A 2019年第1期100卷 012320-012320页

作者： Hsuan-Hao Lu Natalie Klco Joseph M. Lukens Titus D. Morris Aaina Bansal Andreas Ekström Gaute Hagen Thomas Papenbrock Andrew M. Weiner Martin J. Savage Pavel Lougovski School of Electrical and Computer Engineering and Purdue Quantum Science and Engineering Institute Purdue University West Lafayette Indiana 47907 USA Institute for Nuclear Theory University of Washington Seattle Washington 98195-1550 USA Quantum Information Science Group Computational Sciences and Engineering Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Physics Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Department of Physics and Astronomy University of Tennessee Knoxville Tennessee 37996 USA Department of Physics Chalmers University of Technology SE-412 96 Göteborg Sweden

Simulating complex many-body quantum phenomena is a major scientific impetus behind the development of quantum computing, and a range of technologies are being explored to address such systems. We present the results of the largest photonics-based simulation to date, applied in the context of subatomic physics. Using an all-optical quantum frequency processor, the ground-state energies of light nuclei including the triton (H3), He3, and the alpha particle (He4) are computed. Complementing these calculations and utilizing a 68-dimensional Hilbert space, our photonic simulator is used to perform subnucleon calculations of the two- and three-body forces between heavy mesons in the Schwinger model. This work is a first step in simulating subatomic many-body physics on quantum frequency processors—augmenting classical computations that bridge scales from quarks to nuclei.

关键词： quantum computation quantum simulation Optical materials & elements Effective field theory Lattice gauge theory Nuclear many-body theory Optical interferometry Photon counting

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A recursive algebraic coloring technique for hardware-efficient symmetric sparse matrix-vector multiplication

arXiv

引用

arXiv 2019年

作者： Alappat, Christie Hager, Georg Schenk, Olaf Thies, Jonas Basermann, Achim Bishop, Alan R. Fehske, Holger Wellein, Gerhard Department of Computer Science Friedrich-Alexander-Universitat Erlangen-Nurnberg Germany Erlangen Regional Computing Center Friedrich-Alexander-Universität Erlangen-Nürnberg Germany Institute of Computational Science Università della Svizzera Italiana Simulation and Software Technology German Aerospace Center Theory Simulation and Computation Los Alamos National Laboratory Institute of Physics University of Greifswald

The symmetric sparse matrix-vector multiplication (SymmSpMV) is an important building block for many numerical linear algebra kernel operations or graph traversal applications. Parallelizing SymmSpMV on today's multicore platforms with up to 100 cores is di-cult due to the need to manage *** updates on the result vector. Coloring approaches can be used to solve this problem without data duplication, but existing coloring algorithms do not take load balancing and deep memory hierarchies into account, hampering scalability and full-chip performance. In this work, we propose the recursive algebraic coloring engine (RACE), a novel coloring algorithm and open-source library implementation, which eliminates the shortcomings of previous coloring methods in terms of hardware e-ciency and parallelization overhead. We describe the level construction, distance-k coloring, and load balancing steps in RACE, use it to parallelize SymmSpMV, and compare its performance on 31 sparse matrices with other state-of-the-art coloring techniques and Intel MKL on two modern multicore processors. RACE outperforms all other approaches substantially and behaves in accordance with the roofline model. Outliers are discussed and analyzed in detail. While we focus on SymmSpMV in this paper, our algorithm and *** is applicable to any sparse matrix operation with data dependencies that can be resolved by distance-k coloring. Copyright © 2019, The Authors. All rights reserved.

关键词： Coloring

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Operator scaling dimensions and multifractality at measurement-induced transitions

arXiv

引用

arXiv 2021年

作者： Zabalo, Aidan Gullans, M.J. Wilson, J.H. Vasseur, R. Ludwig, A.W.W. Gopalakrishnan, S. Huse, David A. Pixley, J.H. Department of Physics and Astronomy Center for Materials Theory Rutgers University PiscatawayNJ08854 United States Department of Physics Princeton University PrincetonNJ08544 United States Joint Center for Quantum Information and Computer Science NIST/University of Maryland College ParkMD20742 United States Department of Physics and Astronomy Louisiana State University Baton RougeLA70803 United States Center for Computation and Technology Louisiana State University Baton RougeLA70803 United States Department of Physics University of Massachusetts AmherstMA01003 United States Department of Physics University of California Santa BarbaraCA93106 United States Department of Physics The Pennsylvania State University University ParkPA16802 United States Department of Physics and Astronomy CUNY College of Staten Island Staten IslandNY10314 United States Center for Computational Quantum Physics Flatiron Institute 162 5th Avenue New YorkNY10010 United States

Repeated local measurements of quantum many-body systems can induce a phase transition in their entanglement structure. These measurement-induced phase transitions (MIPTs) have been studied for various types of dynamics, yet most cases yield quantitatively similar critical exponents, making it unclear how many distinct universality classes are present. Here, we probe the properties of the conformal field theories governing these MIPTs using a numerical transfer-matrix method, which allows us to extract the effective central charge, as well as the first few low-lying scaling dimensions of operators at these critical points for (1 + 1)-dimensional systems. Our results provide convincing evidence that the generic and Clifford MIPTs for qubits lie in different universality classes and that both are distinct from the percolation transition for qudits in the limit of large on-site Hilbert space dimension. For the generic case, we find strong evidence of multifractal scaling of correlation functions at the critical point, reflected in a continuous spectrum of scaling dimensions. Copyright © 2021, The Authors. All rights reserved.

关键词： Transfer matrix method

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Density-Attentive Head Detector for Crowd Counting

Density-Attentive Head Detector for Crowd Counting

引用

International Conference on Data science and Business Analytics (ICDSBA)

作者： Ziyu Zhao Xingyu Shen Long Lan Xiaoyao Yin Xiang Zhang Yonggang Che Zhigang Luo College of Computer National University of Defense Technology Changsha China Institute for Quantum Information & State Key Laboratory of High Performance Computing National University of Defense Technology Changsha China Science and Technology on Parallel and Distributed Processing National University of Defense Technology Changsha China

ISBN: (数字)9781728146447

ISBN: (纸本)9781728146454

In crowd counting, regression-based method shows better performance in extreme density scenes by introduces a density map. However, the regression-based method fails to locate the positions of each head, which significantly restricts its applications. Detection-based method counts each head with their accurate locations but works only in middle or low-level density scenes. In this paper, a joint learning method, named Density-attentive Head Detector (DAHD) is developed to overcome their respective shortcomings via a multi-task training procedure. Specifically, to guarantee the sensitivity of the detector to small or partially occluded heads, we carefully equip the detector with a density map which learned from regression module. Moreover, a novel Dilated Feature Pyramid Network (DFPN) is introduced to our method to enlarge the receptive field of convolutional kernel, bringing confirmative additional benefits to identify small heads. Experiments on the popular ShanghaiTech and Mall datasets confirm the improved performance of DAHD compared with the current detection-based approaches, and a comparable performance to regression-based approaches in term of counting.

关键词： Detectors Feature extraction Object detection Faces Kernel Training Task analysis

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