检索结果-内蒙古大学图书馆

General framework for verifying pure quantum states in the adversarial scenario

学校读者我要写书评

暂无评论

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

Giant Biquadratic Exchange in 2D Magnets and its Role in Stabilizing Ferromagnetism of NiCl2 Monolayer

学校读者我要写书评

暂无评论

arXiv 2021年

作者： Ni, J.Y. Li, X.Y. Amoroso, D. He, X. Feng, J.S. Kan, E.J. Picozzi, S. Xiang, H.J. Key Laboratory of Computational Physical Sciences Ministry of Education State Key Laboratory of Surface Physics Department of Physics Fudan University Shanghai200433 China Shanghai Qizhi Institution Shanghai200232 China Consiglio Nazionale delle Ricerche CNR-SPIN Via dei Vestini 31 Chieti66100 Italy CSIC BIST Campus UAB Bellaterra Barcelona08193 Spain School of Physics and Materials Engineering Hefei Normal University Hefei230601 China Department of Applied Physics Institution of Energy and Microstructure Nanjing University of Science and Technology Jiangsu Nanjing210094 China Collaborative Innovation Center of Advanced Microstructures Nanjing210093 China

Two-dimensional (2D) van der Waals (vdW) magnets provide an ideal platform for exploring, on the fundamental side, new microscopic mechanisms and for developing, on the technological side, ultra-compact spintronic applications. So far, bilinear spin Hamiltonians have been commonly adopted to investigate the magnetic properties of 2D magnets, neglecting higher order magnetic interactions. However, we here provide quantitative evidence of giant biquadratic exchange interactions in monolayer NiX2 (X=Cl, Br and I), by combining first-principles calculations and the newly developed machine learning method for constructing Hamiltonian. Interestingly, we show that the ferromagnetic ground state within NiCl2 single layers cannot be explained by means of bilinear Heisenberg Hamiltonian;rather, the nearest-neighbor biquadratic interaction is found to be crucial. Furthermore, using a three-orbitals Hubbard model, we propose that the giant biquadratic exchange interaction originates from large hopping between unoccupied and occupied orbitals on neighboring magnetic ions. On a general framework, our work suggests biquadratic exchange interactions to be important in 2D magnets with edge-shared octahedra. Copyright © 2021, The Authors. All rights reserved.

关键词： Magnets

Roof greening in major Chinese cities possibly afford a large potential carbon sink

学校读者我要写书评

暂无评论

science Bulletin 2024年第20期69卷 3216-3220页

作者： Chao Yang Yinghui Zhang Min Chen Song Zhu Yuzhi Tang Zhixin Zhang Wei Ma Huizeng Liu Junyi Chen Bohui Tang Dejin Zhang Zhengdong Huang Xuqing Wang Wei Tu Cuiling Liu Tiezhu Shi Haiying Xu Aihong Cui Fanyi Meng Tianhong Zhao Kai Guo Wenhao Guo Bi Fan Quande Qin Wuyang Hong Haishan Wu Bing Wang Jinrong Zeng Ka Wai Wu Qingquan Li Key Laboratory for Geo-Environmental Monitoring of Great Bay Area Ministry of Natural Resources&Guangdong Key Laboratory of Urban InformaticsShenzhen UniversityShenzhen 518060China School of Architecture and Urban Planning Shenzhen UniversityShenzhen 518060China Key Laboratory of Virtual Geographic Environment Ministry of EducationNanjing Normal UniversityNanjing 210023China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing 210023China International Research Center of Big Data for Sustainable Development Goals Beijing 100094China Shenzhen Zhiyuan Space Innovation Technology Co. LtdShenzhen 518060China Guangdong Laboratory of Artificial Intelligence and Digital Economy(SZ) Shenzhen 518107China School of Geography and Ocean Science Nanjing UniversityNanjing 210008China School of Geography Nanjing Normal UniversityNanjing 210023China School of Civil Engineering Chongqing Jiaotong UniversityChongqing 400074China Institute for Advanced Study&Shenzhen University Shenzhen 518060China Tiandu-Shenzhen University Deep Space Joint Laboratory Shenzhen UniversityShenzhen 518060China Faculty of Land Resource Engineering Kunming University of Science and TechnologyKunming 650093China Center for Hydrogeology and Environmental Geology China Geological SurveyBaoding 071051China Department of Landscape Architecture and Urban Planning Texas A&M UniversityTX 77840USA Department of Geography Hong Kong Baptist UniversityHong Kong 999077China College of Civil and Transportation Engineering Shenzhen UniversityShenzhen 518060China College of Big Data and Internet Shenzhen Technology UniversityShenzhen 518118China Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu 611756China College of Management Shenzhen UniversityShenzhen 518060China WeBank(Shenzhen)Co. LtdShenzhen 518060China Department of Aeronautical and Aviation Engineering The Hong Kong Polytechnic UniversityHong Kong 100872China Esri C

China is experiencing accelerated urbanisation,with a large number of people moving from rural to urban areas[1].It has resulted in large losses in the net primary production(NPP),biodiversity and carbon stocks and an increase in environmental pollution and CO_(2)emissions[2–4].In 2015,196 countries signed the Paris Agreement and committed to setting long-term goals to jointly manage climate change and reduce their individual emissions,aiming to control the increase in global average temperature from the pre-industrial level to below 2℃and to curtail the temperature rise within 1.5℃till the end of the 21st century[5].China is bolstering its efforts to achieve the climate change mitigation goals and has announced a plan for achieving carbon neutrality by 2060[6].The carbon neutrality goal poses a challenge to the current policies promoting rapid urbanisation across China.

关键词： jointly carbon goals

Flexible, High Scintillation Yield Cu3Cu2I5Film Made of Ball-Milled Powder for High Spatial Resolution X-Ray Imaging

学校读者我要写书评

暂无评论

advanced Optical Materials 2022年第5期10卷

作者： Nan Li Ziwei Xu Yingrui Xiao Yucheng Liu Zhou Yang Shengzhong (Frank) Liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology Institute for Advanced Energy Materials and School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 China Dalian National Laboratory for Clean Energy and Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China

Cu halide materials with low electronic dimension show great scintillation properties with high photoluminescence quantum yield (PLQY) and large Stokes shift, which can result in reabsorption-free scintillators. However, there is still a need for a large-scalable method to fabricate large amount of scintillation powder and large-size scintillation films. In this regard, a high scintillation yield Cu 3 Cu 2 I 5 −PDMS flexible film utilizing ball-milled Cu 3 Cu 2 I 5 powder is developed. The ball-milled Cu 3 Cu 2 I 5 powder shows a high PLQY of 74.5%, narrow emission peak of 80 nm and good ambient stability, demonstrating the potential of ball-milling method for large-scale scintillator production. Furthermore, the Cu 3 Cu 2 I 5 −PDMS film shows even high PLQY exceeding 90%, which may be ascribed to the passivation effect of PDMS resulting in a little longer carrier lifetime. The flexible Cu 3 Cu 2 I 5 −PDMS film can further deliver high spatial resolution of 6.8 lp mm −1 @0.2 MTF in X-ray imaging and good stability under steady X-ray illumination. This work demonstrates that the ball-milling method could be an effective approach for large-scale fabrication of low electronic dimensional scintillation materials.

关键词： scintillators ball-milling spatial resolution

Sintered Polycrystalline BiVO4Pellet for Stable X-Ray Detector with Low Detection Limit

学校读者我要写书评

暂无评论

advanced Functional Materials 2023年第16期33卷

作者： Shanshan Jia Yingrui Xiao Nuo Bu Nan Li Deng Li Zhou Yang Shengzhong (Frank) Liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology Institute for Advanced Energy Materials School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 China Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China

Semiconductors based on Bi element show large attenuation coefficients to X-ray photons and have been recognized as candidates for X-ray detectors. However, the application of stable Bi-based oxide materials to X-ray detectors has been rarely investigated. In this research, the X-ray response of a BiVO 4 pellet has been studied. It has been found that the BiVO 4 pellet has a large resistivity of 1.3 × 10 12 Ω cm, negligible current drift of 6.18 × 10 −8 nA cm −1 s −1 V −1 under electrical bias and mobility lifetime product, µτ , of 1.75 × 10 −4 cm 2 V −1 , which renders the pellet with an X-ray sensitivity of 241.3 µC Gy air −1 cm −2 and a detection limit of 62 nGy air s −1 under 40 KVp X-ray illumination and 40 V bias voltage. The BiVO 4 pellet also shows operational stability under steady X-ray illumination with total dose of 2.01 Gy air , equal to the dose of 20 000 medical chest X-ray inspections. This research reveals the potential application of BiVO 4 in X-ray detection devices and inspires further research in this area.

关键词： dark current drift low detection limits stability X-ray detectors

Triplet p-wave superconductivity with ABM state in epitaxial Bi/Ni bilayers

学校读者我要写书评

暂无评论

arXiv 2018年

作者： Zhao, G.J. Gong, X.X. He, J.C. Gifford, J.A. Zhou, H.X. Chen, Y. Jin, X.F. Chien, C.L. Chen, T.Y. Institute for Quantum Science and Engineering Department of Physics Southern University of Science and Technology Shenzhen518055 China Department of Physics Arizona State University TempeAZ85287 United States Department of Physics State Key Laboratory of Surface Physics Fudan University Shanghai200433 China Department of Physics and Astronomy Johns Hopkins University BaltimoreMD21218 United States Collaborative Innovation Center of Advanced Microstructures Nanjing210093 China Institute of Physics Academia Sinica Taipei11519 Taiwan Department of Physics National Taiwan University Taipei10617 Taiwan

We report observation of spin triplet superconductivity in epitaxial Bi/Ni bilayers with TC up to 4 K and 2Δ/kBTC ≈ 12. Andreev reflection spectroscopy (ARS) with ballistic injection of unpolarized and spin-polarized electrons conclusively reveals spin triplet p-wave superconductivity. The gap structure measured by ARS in multiple crystal directions shows the ABM (Anderson-Brinkman-Morel) state, the same as that in superfluid 3He. Copyright © 2018, The Authors. All rights reserved.

关键词： Crystal structure

25.71 %-Efficiency FACsPbI3Perovskite Solar Cells Enabled by A Thiourea-based Isomer

学校读者我要写书评

暂无评论

Angewandte Chemie 2024年第49期136卷

作者： Yong Li Prof. Yuwei Duan Prof. Jiangshan Feng Yiqiao Sun Ke Wang Dr. Hongxiang Li Prof. Huaxin Wang Prof. Zhigang Zang Hui Zhou Dongfang Xu Meizi Wu Yongzhe Li Zhuang Xie Zexia Liu Jingyu Huang Dr. Yao Yao Prof. Qiang Peng Prof. Qunping Fan Prof. Ningyi Yuan Prof. Jianning Ding Prof. Shengzhong Liu Prof. Zhike Liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 China College of Materials and Chemistry & Chemical Engineering Chengdu University of Technology Chengdu 610059 China Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education) Chongqing University Chongqing 400044 China. College of Polymer Science and Engineering State Key Laboratory of Polymer Materials Engineering Sichuan University Chengdu 610065 China State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China. School of Materials Science and Engineering Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Jiangsu Province Cultivation Base for State Key Laboratory of Photovoltaic Science and Technology Changzhou University Changzhou 213164 China

Various isomers have been developed to regulate the morphology and reduce defects in state-of-the-art perovskite solar cells (PSCs). To insight the structure-function-effect correlations for the isomerization of thiourea derivatives on the performance of the PSCs, we developed two thiourea derivatives [(3,5-dichlorophenyl)amino]thiourea (AT) and N-(3,5-dichlorophenyl)hydrazinecarbothioamide (HB). Supported by experimental and calculated results, it was found that AT can bind with undercoordinated Pb 2+ defect through synergistic interaction between N1 and C=S group with a defect formation energy of 1.818 eV, which is much higher than that from the synergistic interaction between two −NH− groups in HB and perovskite (1.015 eV). Moreover, the stronger interaction between AT and Pb 2+ regulates the crystallization process of perovskite film to obtain a high-quality perovskite film with high crystallinity, large grain size, and low defect density. Consequently, the AT-treated FACsPbI 3 device engenders an efficiency of 25.71 % (certified as 24.66 %), which is greatly higher than control (23.74 %) and HB-treated FACsPbI 3 devices (25.05 %). The resultant device exhibits a remarkable stability for maintaining 91.0 % and 95.2 % of its initial efficiency after aging 2000 h in air condition or tracking at maximum power point for 1000 h, respectively.

关键词： perovskite solar cells crystallization process isomer thiourea derivatives high efficiency

Au [email protected] alloy shell nanowires for ethanol oxidation

学校读者我要写书评

暂无评论

Materials Today Physics 2023年 31卷

作者： Qi Xue Zixin Ge Zihan Yuan Jiangtao Huang Bin He Yu Chen Key Laboratory of Macromolecular Science of Shaanxi Province Key Laboratory of Applied Surface and Colloid Chemistry (MOE) Shaanxi Key Laboratory for Advanced Energy Devices School of Materials Science and Engineering Shaanxi Normal University Xi'an 710062 China School of Chemistry and Chemical Engineering Xi'an University of Architecture and Technology Xi'an 710055 China College of New Materials and New Energies Shenzhen Technology University Shenzhen 518118 China

The highly active, selective and stable anode electrocatalysts for the ethanol oxidation reaction (EOR) are extremely desirable for the application of direct ethanol fuel cells (DEFCs). Herein, one-dimensional Au [email protected] 0·20 Rh 0.08 alloy shell nanowires ( [email protected] 0·20 Rh 0.08 CS-NWs) with long aspect ratio and cross-linked network architecture are synthesized. For the EOR, [email protected] 0·20 Rh 0.08 CS-NWs display higher peak current density, better resistance to CO poisoning and more lasting stability compared with [email protected] 0.28 CS-NWs and commercial Pt black electrocatalyst, which can be attributed to the trimetallic synergistic effect between the Au, Pt and Rh atoms. Specifically, the Rh can promote the C–C bonds and adsorb OH ads while Au can change the electronic structure of Pt, endowing Pt with a high anti-poisoning ability to CO ads and promoting the complete oxidation of various C1 intermediate to CO 2 . This work provides an effective strategy for the rational construction of high-performance Pt-based EOR electrocatalysts by optimizing composition, morphology and architecture.

关键词： [email protected] structure Fuel cells Ethanol oxidation reaction Synergic effect Selectivity

Nonlinear phonon Hall effects in ferroelectrics: its existence and non-volatile electrical control

学校读者我要写书评

暂无评论

arXiv 2023年

作者： Luo, W. Ji, J.Y. Chen, P. Xu, Yang Zhang, L.F. Xiang, H.J. Bellaiche, L. Physics Department Institute for Nanoscience and Engineering University of Arkansas FayettevilleAR72701 United States State Key Laboratory of Surface Physics Department of Physics Fudan University Shanghai200433 China Phonon Engineering Research Center of Jiangsu Province Center for Quantum Transport and Thermal Energy Science Institute of Physics Frontiers and Interdisciplinary Sciences School of Physics and Technology Nanjing Normal University Nanjing210023 China Collaborative Innovation Center of Advanced Microstructures Nanjing210093 China Shanghai Qi Zhi Institute Shanghai200232 China School of Physics and Electronic Science East China Normal University Shanghai200241 China

Nonlinear Hall effects have been previously investigated in noncentrosymmetric systems for electronic systems. However, they only exist in metallic systems and are not compatible with ferroelectrics since these latter are insulators, hence limiting their applications. On the other hand, ferroelectrics naturally break inversion symmetry and can induce a non-zero Berry curvature. Here, we show that a non-volatile electric-field control of heat current can be realized in ferroelectrics through the nonlinear phonon Hall effects. More precisely, based on Boltzmann equation under the relaxation-time approximation, we derive the equation for nonlinear phonon Hall effects, and further show that the behaviors of nonlinear phonon (Boson) Hall effects are very different from nonlinear Hall effects for electrons (Fermion). Our work provides a route for electric-field control of thermal Hall current in ferroelectrics. Copyright © 2023, The Authors. All rights reserved.

关键词： Boltzmann equation