检索结果-内蒙古大学图书馆

arXiv 2022年

作者： Liu, Zheng-Hao Meng, Hui-Xian Xu, Zhen-Peng Zhou, Jie Chen, Jing-Ling Xu, Jin-Shi Li, Chuan-Feng Guo, Guang-Can Cabello, Adán CAS Key Laboratory of Quantum Information University of Science and Technology of China Hefei230026 China CAS Centre For Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Hefei230026 China School of Mathematics and Physics North China Electric Power University Beijing102206 China Theoretical Physics Division Chern Institute of Mathematics Nankai University Tianjin300071 China Naturwissenschaftlich-Technische Fakultät Universität Siegen Walter-Flex-Straße 3 Siegen57068 Germany Centre for Quantum Technologies National University of Singapore 117543 Singapore Hefei National Laboratory University of Science and Technology of China Hefei230088 China Departamento de Física Aplicada II Universidad de Sevilla SevillaE-41012 Spain Instituto Carlos I de Física Teórica y Computacional Universidad de Sevilla SevillaE-41012 Spain

Contextuality is a distinctive feature of quantum theory and a fundamental resource for quantum computation. However, existing examples of contextuality in high-dimensional systems lack the necessary robustness required in experiments. Here we address this problem by identifying a family of noncontextuality inequalities whose maximum quantum violation grows with the dimension of the system. At first glance, this contextuality is the single-system version of multipartite Bell nonlocality taken to an extreme form. What is interesting is that the single-system version achieves the same degree of contextuality but uses a Hilbert space of lower dimension. That is, contextuality "concentrates" as the degree of contextuality per dimension increases. We show the practicality of this result by presenting an experimental test of contextuality in a seven-dimensional system. By simulating sequences of quantum ideal measurements with destructive measurements and repreparation in an all-optical setup, we report a violation of 68.7 standard deviations of the simplest case of the noncontextuality inequalities identified. Our results advance the investigation of high-dimensional contextuality, its connection to the Clifford algebra, and its role in quantum computation. © 2022, CC BY-NC-SA.

关键词： Quantum computers

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test of the hadronic interaction models at around *10 TeV with Tibet EAS core data

Test of the hadronic interaction models at around *10 TeV wi...

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32nd International Cosmic Ray Conference, ICRC 2011

作者： Amenomori, M. Bi, X.J. Chen, D. Chen, W.Y. Cui, S.W. Luobu, Danzeng Ding, L.K. Ding, X.H. Feng, C.F. Feng, Zhaoyang Feng, Z.Y. Gou, Q.B. Guo, H.W. Guo, Y.Q. He, H.H. He, Z.T. Hibino, K. Hotta, N. Hu, Haibing Hu, H.B. Huang, J. Li, W.J. Jia, H.Y. Jiang, L. Kajino, F. Kasahara, K. Katayose, Y. Kato, C. Kawata, K. Ciren, Laba Le, G.M. Li, A.F. Liu, C. Liu, J.S. Lu, H. Meng, X.R. Mizutani, K. Munakata, K. Nanjo, H. Nishizawa, M. Ohnishi, M. Ohta, I. Ozawa, S. Qian, X.L. Qu, X.B. Saito, T. Saito, T.Y. Sakata, M. Sako, T.K. Shao, J. Shibata, M. Shiomi, A. Shirai, T. Sugimoto, H. Takita, M. Tan, Y.H. Tateyama, N. Torii, S. Tsuchiya, H. Udo, S. Wang, H. Wu, H.R. Xue, L. Yamamoto, Y. Yang, Z. Yasue, S. Yuan, A.F. Yuda, T. Zhai, L.M. Zhang, H.M. Zhang, J.L. Zhang, X.Y. Zhang, Y. Zhang, Y.I. Zhang, Ying Ngzhu, Zhaxisa Zhou, X.X. Department of Physics Hirosaki University Hirosaki 036-8561 Japan Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Institute for Cosmic Ray Research University of Tokyo Kashiwa 277-8582 Japan Department of Physics Hebei Normal University Shijiazhuang 050016 China Department of Mathematics and Physics Tibet University Lhasa 850000 China Department of Physics Shandong University Jinan 250100 China Institute of Modern Physics SouthWest Jiaotong University Chengdu 610031 China Faculty of Engineering Kanagawa University Yokohama 221-8686 Japan Faculty of Education Utsunomiya University Utsunomiya 321-8505 Japan Department of Physics Konan University Kobe 658-8501 Japan Research Institute for Science and Engineering Waseda University Tokyo 169-8555 Japan Faculty of Engineering Yokohama National University Yokohama 240-8501 Japan Department of Physics Shinshu University Matsumoto 390-8621 Japan School of Information Science and Engineering Shandong Agriculture University Taian 271018 China Saitama University Saitama 338-8570 Japan National Institute of Informatics Tokyo 101-8430 Japan Sakushin Gakuin University Utsunomiya 321-3295 Japan Tokyo Metropolitan College of Industrial Technology Tokyo 116-8523 Japan Max-Planck-Institut Für Physik München D-80805 Germany College of Industrial Technology Nihon University Narashino 275-8576 Japan Shonan Institute of Technology Fujisawa 251-8511 Japan RIKEN Wako 351-0198 Japan School of General Education Shinshu University Matsumoto 390-8621 Japan

A hybrid experiment has been started by ASγ collaboration at Tibet, China, since May 2009, that consists of a burst-detector-grid (YAC, Yangbajing Air shower Core array) and the Tibet air-shower array (Tibet-III). The first step of YAC, called YAC-I, contains 16 detector units and observes high energy electromagnetic particles in air-shower cores within several meters from the shower axis, and Tibet-III array measures the total energy and the arrival direction of air showers. YAC-I is used to check hadronic interaction models currently used for air-shower simulations such as QGSJET, SIBYLL , EPOS etc. through the multi-parameter measurement in air-shower cores. In this paper, we used a data set collected from May 1st 2009 through February 23rd 2010 by the YAC-I. The effective live time used for the present analysis is 169.65 days. The preliminary results of the interaction model checking at *10 TeV energy region is reported in this paper.

关键词： Cosmic rays

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Air-shower core detector array to study the mass composition of cosmic rays beyond 100 TeV by Tibet hybrid experiment

Air-shower core detector array to study the mass composition...

引用

32nd International Cosmic Ray Conference, ICRC 2011

作者： Amenomori, M. Bi, X.J. Chen, D. Chen, W.Y. Cui, S.W. Danzengluobu Ding, L.K. Ding, X.H. Feng, C.F. Feng, Zhaoyang Feng, Z.Y. Gou, Q.B. Guo, H.W. Guo, Y.Q. He, H.H. He, Z.T. Hibino, K. Hotta, N. Hu, Haibing Hu, H.B. Huang, J. Li, W.J. Jia, H.Y. Jiang, L. Kajino, F. Kasahara, K. Katayose, Y. Kato, C. Kawata, K. Labaciren Le, G.M. Li, A.F. Liu, C. Liu, J.S. Lu, H. Meng, X.R. Mizutani, K. Munakata, K. Nanjo, H. Nishizawa, M. Ohnishi, M. Ohta, I. Ozawa, S. Qian, X.L. Qu, X.B. Saito, T. Saito, T.Y. Sakata, M. Sako, T.K. Shao, J. Shibata, M. Shiomi, A. Shirai, T. Sugimoto, H. Takita, M. Tan, Y.H. Tateyama, N. Torii, S. Tsuchiya, H. Udo, S. Wang, H. Wu, H.R. Xue, L. Yamamoto, Y. Yang, Z. Yasue, S. Yuan, A.F. Yuda, T. Zhai, L.M. Zhang, H.M. Zhang, J.L. Zhang, X.Y. Zhang, Y. Zhang, Y.I. Zhang, Ying Zhaxisangzhu Zhou, X.X. Department of Physics Hirosaki University Hirosaki 036-8561 Japan Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Institute for Cosmic Ray Research University of Tokyo Kashiwa 277-8582 Japan Department of Physics Hebei Normal University Shijiazhuang 050016 China Department of Mathematics and Physics Tibet University Lhasa 850000 China Department of Physics Shandong University Jinan 250100 China Institute of Modern Physics SouthWest Jiaotong University Chengdu 610031 China Faculty of Engineering Kanagawa University Yokohama 221-8686 Japan Faculty of Education Utsunomiya University Utsunomiya 321-8505 Japan Department of Physics Konan University Kobe 658-8501 Japan Research Institute for Science and Engineering Waseda University Tokyo 169-8555 Japan Faculty of Engineering Yokohama National University Yokohama 240-8501 Japan Department of Physics Shinshu University Matsumoto 390-8621 Japan School of Information Science and Engineering Shandong Agriculture University Taian 271018 China Saitama University Saitama 338-8570 Japan National Institute of Informatics Tokyo 101-8430 Japan Sakushin Gakuin University Utsunomiya 321-3295 Japan Tokyo Metropolitan College of Industrial Technology Tokyo 116-8523 Japan Max-Planck-Institut Für Physik München D-80805 Germany College of Industrial Technology Nihon University Narashino 275-8576 Japan Shonan Institute of Technology Fujisawa 251-8511 Japan RIKEN Wako 351-0198 Japan School of General Education Shinshu University Matsumoto 390-8621 Japan

New air-shower core detector YAC has been developed to measure cosmic-ray mass composition around the energy region of the knee. Prototype experiment YAC1 was successfully carried out in 2009-2010 together with Tibet III air-shower array. Enlarged installation YAC2 is also under construction and will be operated in fall 2011. Preliminary result of YAC1 and performance of YAC2 are presented in this paper. The test of interaction models currently used in air-shower simulation was made using YAC1 results. Burst size flux predicted by QGSJET2 and SIBYLL models are compatible with data of YAC1 while QGSJET1 predicts 20 % lower flux and EPOS does 30 % lower flux. Proton flux was derived from YAC1 data based on QGSJET2 model and it is smoothly connected with direct observation data at lower energies and also with previously reported our works at higher energies.

关键词： Cosmic rays

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DRUM: Diffusion-based runoff model for probabilistic flood forecasting

arXiv

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arXiv 2024年

作者： Ou, Zhigang Nai, Congyi Pan, Baoxiang Pan, Ming Shen, Chaopeng Jiang, Peishi Liu, Xingcai Tang, Qiuhong Li, Wenqing Zheng, Yi School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen China Key Laboratory of Earth System Numerical Modeling and Application Institute of Atmospheric Physics Chinese Academy of Science Beijing China Scripps Institution of Oceanography University of California La Jolla San DiegoCA United States Civil and Environmental Engineering The Pennsylvania State University University ParkPA United States Atmospheric Climate and Earth Sciences Division Pacific Northwest National Laboratory RichlandWA United States Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing China State Key Laboratory of Stimulation and Regulation of Water Cycles in River Basins China Institute of Water Resources and Hydropower Research Beijing China

Reliable flood forecasting remains a critical challenge due to persistent underestimation of peak flows and inadequate uncertainty quantification in current approaches. We present DRUM (Diffusion-based Runoff Model), a generative AI solution for probabilistic runoff prediction. DRUM builds up an iterative refinement process that generates ensemble runoff estimates from noise, guided by past meteorological conditions, present meteorological forecasts, and static catchment attributes. This framework allows learning complex hydrological behaviors without imposing explicit distributional assumptions, particularly benefiting extreme event prediction and uncertainty quantification. Using data from 531 representative basins across the contiguous United States, DRUM outperforms state-of-the-art deep learning methods in runoff forecasting regarding both deterministic and probabilistic skills, with particular advantages in extreme flow (1%) predictions. DRUM demonstrates superior flood early warning skill across all magnitudes and lead times (1–7 days), achieving F1 scores near 0.4 for extreme events under perfect forecasts and maintaining robust performance with operational forecasts, especially for longer lead times and high-magnitude floods. When applied to climate projections through the 21st century, DRUM reveals increasing flood vulnerability in 47.8–57.1% of basins across emission scenarios, with particularly elevated risks along the West Coast and Southeast regions. These advances demonstrate significant potential for improving both operational flood forecasting and long-term risk assessment in a changing climate. © 2024, CC BY-NC-SA.

关键词： Floods

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The Most Probable Transition Paths of Stochastic Dynamical Systems: A Sufficient and Necessary Characterization

arXiv

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arXiv 2021年

作者： Huang, Yuanfei Huang, Qiao Duan, Jinqiao School of Mathematics and Statistics Center for Mathematical Sciences Hubei Key Laboratory of Engineering Modeling and Scientific Computing Huazhong University of Science and Technology Wuhan430074 China Department of Statistics and Data Science National University of Singapore 6 Science Drive 2 Singapore117546 Singapore School of Data Science City University of Hong Kong Kowloon Hong Kong Department of Mathematics Faculty of Sciences University of Lisbon Campo Grande Edifício C6 LisboaPT-1749-016 Portugal Division of Mathematical Sciences School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore637371 Singapore The Dongguan Key Laboratory for Data Science and Intelligent Medicine Department of Mathematics Department of Physics Great Bay University Guangdong Dongguan523000 China

The most probable transition paths of a stochastic dynamical system are the global minimizers of the Onsager–Machlup action functional and can be described by a necessary but not sufficient condition, the Euler–Lagrange equation (a second-order differential equation with initial-terminal conditions) from a variational principle. This work is devoted to showing a sufficient and necessary characterization for the most probable transition paths of stochastic dynamical systems with Brownian noise. We prove that, under appropriate conditions, the most probable transition paths are completely determined by a first-order ordinary differential equation. The equivalence is established by showing that the Onsager–Machlup action functional of the original system can be derived from the corresponding Markovian bridge process. For linear stochastic systems and the nonlinear Hongler’s model, the first-order differential equations determining the most probable transition paths are shown analytically to imply the Euler–Lagrange equations of the Onsager–Machlup functional. For general nonlinear systems, the determining first-order differential equations can be approximated, in a short time or for the small noise case. Some numerical experiments are presented to illustrate our results. Copyright © 2021, The Authors. All rights reserved.

关键词： Dynamical systems

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Development of spectrometer for ultra-high-field human non-proton magnetic resonance imaging system

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Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of technology 2015年 35卷 39-44页

作者： Zhang, Zhi He, Yu-Gui Wang, Chao Yang, Chun-Sheng Wang, Dong Wang, Lei Chen, Fang Liu, Chao-Yang State Key Laboratory of Magnet Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences WuhanHubei430071 China University of Chinese Academy of Sciences Beijing100048 China Wuhan National Laboratory for Optoelectronics School of Optoelectronic Science and Engineering Huazhong University of Science and Technology WuhanHubei430074 China

A digital multi-channel MRI spectrometer based on USB 3.0 bus structure was presented to improve data transmission efficiency and communication reliability. This system is also suitable for multi-channel extension. High-speed external memory chips were used to store pulse sequence binary (PSB) elements and acquisition data. In this way, the execution speed of pulse sequence and transmission efficiency of acquisition data can be greatly improved, thereby implementing the ultra-fast MRI sequences. A preliminary test has been accomplished on a Bruker 4.7 T MRI system, and high quality 1H spin-echo MRI images for a phantom and 23Na MRI images for NaCl solution with different concentrations have been obtained successfully. Results suggest that the design of the control system is feasible and reliable. ©, 2015, Beijing Institute of technology. All right reserved.

关键词： Magnetic resonance imaging

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test of the hadronic interaction model EPOS-LHC and QGSJETII-04 with Tibet EAS core data 33

Test of the hadronic interaction model EPOS-LHC and QGSJETII...

引用

33rd International Cosmic Rays Conference, ICRC 2013

作者： Amenomori, M. Bi, X.J. Chen, D. Chen, T.L. Chen, W.Y. Cui, S.W. Danzengluobu Ding, L.K. Feng, C.F. Feng, Zhaoyang Feng, Z.Y. Gou, Q.B. Guo, Y.Q. He, H.H. He, Z.T. Hibino, K. Hotta, N. Hu, Haibing Hu, H.B. Hu, X.B. Huang, J. Jia, H.Y. Jiang, L. Kajino, F. Kasahara, K. Katayose, Y. Kato, C. Kawata, K. Kozai, M. Labaciren Le, G.M. Li, A.F. Li, H.J. Li, W.J. Liu, C. Liu, J.S. Liu, M.Y. Lu, H. Meng, X.R. Mizutani, K. Munakata, K. Nanjo, H. Nishizawa, M. Ohnishi, M. Ohta, I. Ozawa, S. Qian, X.L. Qu, X.B. Saito, T. Saito, T.Y. Sakata, M. Sako, T.K. Shao, J. Shibata, M. Shiomi, A. Shirai, T. Sugimoto, H. Takita, M. Tan, Y.H. Tateyama, N. Torii, S. Tsuchiya, H. Udo, S. Wang, H. Wu, H.R. Xue, L. Yamamoto, Y. Yang, Z. Yasue, S. Yuan, A.F. Yuda, T. Zhai, L.M. Zhang, H.M. Zhang, J.L. Zhang, X.Y. Zhang, Y. Zhang, Yi Zhang, Ying Zhaxisangzhu Zhou, X.X. Department of Physics Hirosaki University Hirosaki036-8561 Japan Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China National Astronomical Observatories Chinese Academy of Sciences Beijing100012 China Department of Mathematics and Physics Tibet University Lhasa850000 China Department of Physics Hebei Normal University Shijiazhuang050016 China Department of Physics Shandong University Jinan250100 China Institute of Modern Physics SouthWest Jiaotong University Chengdu610031 China Faculty of Engineering Kanagawa University Yokohama221-8686 Japan Faculty of Education Utsunomiya University Utsunomiya321-8505 Japan Department of Physics Konan University Kobe658-8501 Japan Research Institute for Science and Engineering Waseda University Tokyo169-8555 Japan Faculty of Engineering Yokohama National University Yokohama240-8501 Japan Department of Physics Shinshu University Matsumoto390-8621 Japan Institute for Cosmic Ray Research University of Tokyo Kashiwa277-8582 Japan School of Information Science and Engineering Shandong Agriculture University Taian271018 China Saitama University Saitama338-8570 Japan National Institute of Informatics Tokyo101-8430 Japan Sakushin Gakuin University Utsunomiya321-3295 Japan College of Science China University of Petroleum Qingdao266555 China Tokyo Metropolitan College of Industrial Technology Tokyo116-8523 Japan Max-Planck-Institut für Physik MünchenD-80805 Germany College of Industrial Technology Nihon University Narashino275-8576 Japan Shonan Institute of Technology Fujisawa251-8511 Japan Japan Atomic Energy Agency Tokai-mura319-1195 Japan School of General Education Shinshu University Matsumoto390-8621 Japan

ISBN: (纸本)9788589064293

A hybrid experiment has been started by The Tibet ASγ collaboration at Tibet, China. It consists of a burst-detector-grid (YAC, Yangbajing Air Shower Core array) and the Tibet air-shower array (Tibet-III). The Tibet-III array is used to measure the total energy and the arrival direction of the air-showers, and YAC-I observes high energy electromagnetic particles in air-shower cores. By comparing the MC data with our experimental data, we examine hadronic interaction models currently used for air-shower simulation code CORSIKA(ver.7.3500), especially EPOS-LHC(ver.3400) and QGSJETII-04. In this paper, the preliminary results on the interaction model check at *10 TeV energy region is reported using YAC-I data taken from May 1st 2009 through February 23rd 2010 with the effective live time 152.16 days. © 2013 Sociedade Brasileira de Fisica. All Rights Reserved.

关键词： Cosmic rays

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Progress report on the MD-A under TIBET III array 33

Progress report on the MD-A under TIBET III array

引用

33rd International Cosmic Rays Conference, ICRC 2013

作者： Amenomori, M. Bi, X.J. Chen, D. Chen, T.L. Chen, W.Y. Cui, S.W. Danzengluobu Ding, L.K. Feng, C.F. Feng, Zhaoyang Feng, Z.Y. Gou, Q.B. Guo, Y.Q. He, H.H. He, Z.T. Hibino, K. Hotta, N. Haibing, Hu Hu, H.B. Huang, J. Jia, H.Y. Jiang, L. Kajino, F. Kasahara, K. Katayose, Y. Kato, C. Kawata, K. Kozai, M. Labaciren Le, G.M. Li, A.F. Li, H.J. Li, W.J. Liu, C. Liu, J.S. Liu, M.Y. Lu, H. Meng, X.R. Mizutani, K. Munakata, K. Nanjo, H. Nishizawa, M. Ohnishi, M. Ohta, I. Ozawa, S. Qian, X.L. Qu, X.B. Saito, T. Saito, T.Y. Sakata, M. Sako, T.K. Shao, J. Shibata, M. Shiomi, A. Shirai, T. Sugimoto, H. Takita, M. Tan, Y.H. Tateyama, N. Torii, S. Tsuchiya, H. Udo, S. Wang, H. Wu, H.R. Xue, L. Yamamoto, Y. Yang, Z. Yasue, S. Yuan, A.F. Yuda, T. Zhai, L.M. Zhang, H.M. Zhang, J.L. Zhang, X.Y. Zhang, Y. Zhang, Y.I. Zhang, Ying Zhaxisangzhu Zhou, X.X. Department of Physics Hirosaki University Hirosaki036-8561 Japan Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China National Astronomical Observatories Chinese Academy of Sciences Beijing100012 China Department of Mathematics and Physics Tibet University Lhasa850000 China Department of Physics Hebei Normal University Shijiazhuang050016 China Department of Physics Shandong University Jinan250100 China Institute of Modern Physics SouthWest Jiaotong University Chengdu610031 China Faculty of Engineering Kanagawa University Yokohama221-8686 Japan Faculty of Education Utsunomiya University Utsunomiya321-8505 Japan Department of Physics Konan University Kobe658-8501 Japan Research Institute for Science and Engineering Waseda University Tokyo169-8555 Japan Faculty of Engineering Yokohama National University Yokohama240-8501 Japan Department of Physics Shinshu University Matsumoto390-8621 Japan Institute for Cosmic Ray Research University of Tokyo Kashiwa277-8582 Japan School of Information Science and Engineering Shandong Agriculture University Taian271018 China Saitama University Saitama338-8570 Japan National Institute of Informatics Tokyo101-8430 Japan Sakushin Gakuin University Utsunomiya321-3295 Japan College of Science China University of Petroleum Qingdao266555 China Tokyo Metropolitan College of Industrial Technology Tokyo116-8523 Japan Max-Planck-Institut für Physik MünchenD-80805 Germany College of Industrial Technology Nihon University Narashino275-8576 Japan Shonan Institute of Technology Fujisawa251-8511 Japan Japan Atomic Energy Agency Tokai-mura319-1195 Japan School of General Education Shinshu University Matsumoto390-8621 Japan

ISBN: (纸本)9788589064293

The underground muon detector array of 4500m2(5 modules) is constructed underneath the Tibet ASγ experiment, improving the γ/P separation ability and then the sensitivity for gamma ray observation around 100 TeV. Each module of the muon detector is a large water tank with PMTs in the center, using water Cherenkov technique to obtain the muon signal. In one module (MD-A), the large Tyvek bag is employed filled with high-purity water keeping long-term stability of the water quality. The test run data of MD-A have shown the detector has good position uniformity, and the muon signal can be clearly separated from the noises. In this paper, the design and performance of the detector are presented. © 2013 Sociedade Brasileira de Fisica. All Rights Reserved.

关键词： Gamma rays

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Revealing energy dependence of quantum defects via two heteronuclear atoms in an optical tweezer

arXiv

引用

arXiv 2019年

作者： Wang, Kunpeng He, Xiaodong Gao, Xiang Guo, Ruijun Xu, Peng Zhuang, Jun Li, Runbing Liu, Min Wang, Jin Li, Jiaming Zhan, Mingsheng State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan National Laboratory for Optoelectronics Wuhan430071 China Center for Cold Atom Physics Chinese Academy of Sciences Wuhan430071 China School of Physics University of Chinese Academy of Sciences Beijing100049 China Institute for Theoretical Physics Vienna University of Technology ViennaA-1040 Austria Beijing Computational Science Research Center Beijing100193 China Department of Physics Center for Atomic and Molecular Nanosciences Tsinghua University Beijing100084 China Department of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Collaborative Innovation Center of Quantum Matter Beijing100084 China

As a physically motivated and computationally simple model for cold atomic and molecular collisions, the multichannel quantum defect theory (MQDT) with frame transformation (FT) formalism provides an analytical treatment of scattering resonances in an arbitrary partial wave between alkali-metal atoms, leading to the experimental observation of p− and d−wave resonances. However, the inconsistency of quantum defects for describing scattering resonances shows up when compared with experiments. Here, with two heteronuclear atoms in the ground state of an optical tweezer, the energy dependence of quantum defects is obviously revealed by comparing the measured s-wave scattering length with the prediction of MQDT-FT. By dividing the quantum defects into energy sensitive and insensitive categories, the inconsistency is ultimately removed while retaining the analytic structure of MQDT-FT. This study represents a significant improvement in the analytical MQDT-FT and demonstrates that a clean two-particle system is valuable to the test of collisional physics. Copyright © 2019, The Authors. All rights reserved.

关键词： Atoms

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Optimal verification and fidelity estimation of maximally entangled states

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 Singapore117542 Singapore

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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