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arXiv 2023年

作者： Alexandrou, Constantia Bacchio, Simone Cichy, Krzysztof Constantinou, Martha Feng, Xu Jansen, Karl Liu, Chuan Sen, Aniket Spanoudes, Gregoris Steffens, Fernanda Tarello, Jacopo Department of Physics University of Cyprus P.O. Box 20537 Nicosia1678 Cyprus Computation-based Science and Technology Research Center The Cyprus Institute 20 Kavafi Street Nicosia2121 Cyprus Faculty of Physics Adam Mickiewicz University ul. Uniwersytetu Poznańskiego 2 Poznań61-614 Poland Temple University 1925 N. 12th Street PhiladelphiaPA19122-1801 United States School of Physics State Key Laboratory of Nuclear Physics and Technology Peking University Beijing100871 China Collaborative Innovation Center of Quantum Matter Beijing100871 China Center for High Energy Physics Peking University Beijing100871 China NIC DESY Platanenallee 6 ZeuthenD-15738 Germany Helmholtz Institut für Strahlen- und Kernphysik Rheinische Friedrich-Wilhelms-Universität Bonn Nussallee 14-16 Bonn53115 Germany Bethe Center for Theoretical Physics Rheinische Friedrich-Wilhelms-Universität Bonn Nussallee 12 Bonn53115 Germany

Staple-shaped Wilson line operators are necessary for the study of transverse momentum-dependent parton distribution functions (TMDPDFs) in lattice QCD and beyond. In this work, we study the renormalization of such operators in the general case of an asymmetric staple. We analyze the mixing pattern of these operators using their symmetry properties, where we find that the possible mixing is restricted within groups of four operators. We then present numerical results using the regularization independent momentum subtraction (RI/MOM) scheme to study the importance of mixing using one operator in particular, the γ0 operator. Based on these results, we consider the short distance ratio (SDR) scheme, which is desirable in the absence of mixing. Finally, we investigate a variant of the RI/MOM scheme, where the renormalization factors are computed at short distances. © 2023, CC BY.

关键词： Mixing

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Linear combination of Hamiltonian simulation for nonunitary dynamics with optimal state preparation cost

arXiv

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arXiv 2023年

作者： An, Dong Liu, Jin-Peng Lin, Lin Joint Center for Quantum Information and Computer Science University of Maryland MD20742 United States Department of Mathematics University of California BerkeleyCA94720 United States Simons Institute for the Theory of Computing University of California BerkeleyCA94720 United States Center for Theoretical Physics Massachusetts Institute of Technology CambridgeMA02139 United States Applied Mathematics and Computational Research Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Challenge Institute for Quantum Computation University of California BerkeleyCA94720 United States

We propose a simple method for simulating a general class of non-unitary dynamics as a linear combination of Hamiltonian simulation (LCHS) problems. LCHS does not rely on converting the problem into a dilated linear system problem, or on the spectral mapping theorem. The latter is the mathematical foundation of many quantum algorithms for solving a wide variety of tasks involving non-unitary processes, such as the quantum singular value transformation. The LCHS method can achieve optimal cost in terms of state preparation. We also demonstrate an application for open quantum dynamics simulation using the complex absorbing potential method with near-optimal dependence on all parameters. Copyright © 2023, The Authors. All rights reserved.

关键词： Hamiltonians

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Nodeless kagome superconductivity in LaRu3Si2

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Physical Review Materials 2021年第3期5卷 034803-034803页

作者： C. Mielke, III Y. Qin J.-X. Yin H. Nakamura D. Das K. Guo R. Khasanov J. Chang Z. Q. Wang S. Jia S. Nakatsuji A. Amato H. Luetkens G. Xu M. Z. Hasan Z. Guguchia Laboratory for Muon Spin Spectroscopy Paul Scherrer Institute CH-5232 Villigen PSI Switzerland Physik-Institut Universitat Zurich Winterthurerstrasse 190 CH-8057 Zurich Switzerland Wuhan National High Magnetic Field Center and School of Physics Huazhong University of Science and Technology Wuhan 430074 China Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7) Department of Physics Princeton University Princeton New Jersey 08544 USA Institute for Solid State Physics University of Tokyo Kashiwa 277-8581 Japan International Center for Quantum Materials and School of Physics Peking University Beijing 100871 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Science Beijing 100864 China Department of Physics Boston College Chestnut Hill Massachusetts 02467 USA Princeton Institute for the Science and Technology of Materials Princeton University Princeton New Jersey 08540 USA Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Quantum Science Center Oak Ridge Tennessee 37831 USA

We report muon spin rotation (μSR) experiments together with first-principles calculations on microscopic properties of superconductivity in the kagome superconductor LaRu3Si2 with Tc≃ 7K. Below Tc, μSR reveals type-II superconductivity with a single s-wave gap, which is robust against hydrostatic pressure up to 2 GPa. We find that the calculated normal state band structure features a kagome flat band, and Dirac as well as van Hove points formed by the Ru-dz2 orbitals near the Fermi level. We also find that electron-phonon coupling alone can only reproduce a small fraction of Tc from calculations, which suggests other factors in enhancing Tc such as the correlation effect from the kagome flat band, the van Hove point on the kagome lattice, and the high density of states from narrow kagome bands. Our experiments and calculations taken together point to nodeless moderate coupling kagome superconductivity in LaRu3Si2.

关键词： Electronic structure Kagome lattice Unconventional superconductors Muon spin relaxation & rotation

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Progress in nuclear astrophysics of east and southeast Asia

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AAPPS Bulletin 2021年第1期31卷 1-31页

作者： Aziz, Azni Abdul Ahmad, Nor Sofiah Ahn, S. Aoki, Wako Bhuyan, Muruthujaya Chen, Ke-Jung Guo, Gang Hahn, K.I. Kajino, Toshitaka Kassim, Hasan Abu Kim, D. Kubono, Shigeru Kusakabe, Motohiko Li, A. Li, Haining Li, Z.H. Liu, W.P. Liu, Z.W. Motobayashi, Tohru Pan, Kuo-Chuan Park, T.-S. Shi, Jian-Rong Tang, Xiaodong Wang, W. Wen, Liangjian Wu, Meng-Ru Yan, Hong-Liang Yusof, Norhasliza Department of Physics Kulliyyah of Science International Islamic University Malaysia Pahang Darul Makmur Kuantan 25200 Malaysia Department of Physics University of Malaya Kuala Lumpur 50603 Malaysia Center for Exotic Nuclear Studies Institute for Basic Science (IBS) Daejeon 34126 South Korea National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo 181-8588 Japan Institute of Astronomy and Astrophysics Academia Sinica Taipei 10617 Taiwan Institute of Physics Academia Sinica Taipei 11529 Taiwan School of Mathematics and Physics China University of Geosciences Wuhan 430074 China Department of Science Education Ewha Womans University Seoul 03760 South Korea Graduate School of Science The University of Tokyo Hongo Bunkyo-ku Tokyo 113-0033 Japan School of Physics and International Research Center for Big-Bang Cosmology and Element Genesis Beihang University Beijing 100083 China Center for Exotic Nuclear Studies Institute for Basic Science(IBS) Daejeon 34126 South Korea Center for Nuclear Study University of Tokyo 2-1 Hiroswa Wako Saitama 351-0198 Japan RIKEN Nishina Center 2-1 Hirosawa Wako Saitama 351-0198 Japan Department of Astronomy Xiamen University Fujian Xiamen 361005 China CAS Key Laboratory of Optical Astronomy National Astronomical Observatories Beijing 100101 China China Institute of Atomic Energy Beijing 102413 China Yunnan Observatories Chinese Academy of Sciences Kunming 650216 China Department of Physics National Tsing Hua University Hsinchu 30013 Taiwan Institute of Astronomy National Tsing Hua University Hsinchu 30013 Taiwan Center for Informatics and Computation in Astronomy Hsinchu 30013 Taiwan Center for informatics and Computation in Astronomy National Tsing Hua University Hsinchu 30013 Taiwan School of Astronomy and Space Science University of Chinese Academy of Sciences Beijing 100049 China Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China Joint department for

Nuclear astrophysics is an interdisciplinary research field of nuclear physics and astrophysics, seeking for the answer to a question, how to understand the evolution of the universe with the nuclear processes which we learn. We review the research activities of nuclear astrophysics in east and southeast Asia which includes astronomy, experimental and theoretical nuclear physics, and astrophysics. Several hot topics such as the Li problems, critical nuclear reactions and properties in stars, properties of dense matter, r-process nucleosynthesis, and ν-process nucleosynthesis are chosen and discussed in further details. Some future Asian facilities, together with physics perspectives, are introduced. © 2021, The Author(s).

关键词： East and southeast Asia Nuclear astrophysics

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Prospects of Searching for Type Ia Supernovae with 2.5-m Wide Field Survey Telescope

arXiv

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arXiv 2022年

作者： Hu, Maokai Hu, Lei Jiang, Ji-An Xiao, Lin Fan, Lulu Wei, Junjie Wu, Xuefeng Purple Mountain Observatory Chinese Academy of Sciences Nanjing210023 China School of Astronomy and Space Sciences University of Science and Technology of China Hefei230026 China National Astronomical Observatory of Japan National Institutes of Natural Sciences 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Department of Physics College of Physical Sciences and Technology Hebei University Wusidong Road 180 Baoding071002 China Key Laboratory of High-Precision Computation and Application of Quantum Field Theory of Hebei Province Hebei University Wusidong Road 180 Baoding071002 China Department of Astronomy University of Science and Technology of China Hefei230026 China

Type Ia Supernovae (SNe Ia) are the thermonuclear explosion of a carbon-oxygen white dwarf (WD) and are well-known as a distance indicator. However, it is still unclear how WDs increase their mass near the Chandrasekhar limit and how the thermonuclear runaway happens. The observational clues associated with these open questions, such as the photometric data within hours to days since the explosion, are scarce. Thus, an essential way is to discover SNe Ia at specific epochs with optimal surveys. The 2.5-m Wide Field Survey Telescope (WFST) is an upcoming survey facility deployed in western China. In this paper, we assess the detecability of SNe Ia with mock observations of WFST. Followed by the volumetric rate, we generate a spectral series of SNe Ia based on a data-based model and introduce the line-of-sight extinction to calculate the brightness from the observer. By comparing with the detection limit of WFST, which is affected by the observing conditions, we can count the number of SNe Ia discovered by mock WFST observations. We expect that WFST can find more than 3.0 × 104 pre-maximum SNe Ia within one-year running. In particular, WFST could discover about 45 bright SNe Ia, 99 early-phase SNe Ia, or 1.1 × 104 well-observed SNe Ia with the hypothesized Wide, Deep, or Medium mode, respectively, suggesting WFST will be an influential facility in time-domain astronomy. © 2022, CC BY-NC-SA.

关键词： Supernovae

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Resonant tunneling in disordered borophene nanoribbons with line defects

arXiv

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arXiv 2022年

作者： Hu, Pei-Jia Wang, Si-Xian Chen, Xiao-Feng Liang, Zeng-Ren Fang, Tie-Feng Guo, Ai-Min Xu, Hui Sun, Qing-Feng Hunan Key Laboratory for Super-Microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha410083 China School of Physical Science and Technology Lanzhou University Lanzhou730000 China School of Sciences Nantong University Nantong226019 China International Center for Quantum Materials School of Physics Peking University Beijing100871 China Collaborative Innovation Center of Quantum Matter Beijing100871 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing100190 China

Very recently, borophene has been attracting extensive and ongoing interest as the new wonder material with structural polymorphism and superior attributes, showing that the structural imperfection of line defects (LDs) occurs widely at the interface between ν1/5 (χ3) and ν1/6 (β12) boron sheets. Motivated by these experiments, here we present a theoretical study of electron transport through two-terminal disordered borophene nanoribbons (BNRs) with random distribution of LDs. Our results indicate that LDs could strongly affect the electron transport properties of BNRs. In the absence of LDs, both ν1/5 and ν1/6 BNRs exhibit metallic behavior, in agreement with experiments. While in the presence of LDs, the overall electron transport ability is dramatically decreased, but some resonant peaks of conductance quantum can be found in the transmission spectrum of any disordered BNR with arbitrary arrangement of LDs. These disordered BNRs exhibit metal-insulator transition by varying nanoribbon width with tunable transmission gap in the insulating regime. Furthermore, the bond currents present fringe patterns and two evolution phenomena of resonant peaks are revealed for disordered BNRs with different widths. These results may help for understanding structure-property relationships and designing LD-based nanodevices. Copyright © 2022, The Authors. All rights reserved.

关键词： Nanoribbons

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Basis light-front quantization for the Λb and Σb baryons

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Physical Review D 2025年第9期111卷 094012-094012页

作者： Lingdi Meng Tian-Cai Peng Zhi Hu Siqi Xu Jiangshan Lan Chandan Mondal Guo-Li Wang Xingbo Zhao James P. Vary Department of Physics Hebei University Baoding 071002 China Institute of Modern Physics Chinese Academy of Sciences Lanzhou Gansu 730000 China School of Physical Science and Technology Lanzhou University Lanzhou 730000 China Lanzhou Center for Theoretical Physics Key Laboratory of Theoretical Physics of Gansu Province Lanzhou University Lanzhou 730000 China Key Laboratory of Quantum Theory and Applications of MoE Lanzhou University Lanzhou 730000 China Research Center for Hadron and CSR Physics Lanzhou University and Institute of Modern Physics of CAS Lanzhou 730000 China High Energy Accelerator Research Organization (KEK) Ibaraki 305-0801 Japan School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing 100049 China Department of Physics and Astronomy Iowa State University Ames Iowa 50011 USA Advanced Energy Science and Technology Guangdong Laboratory Huizhou Guangdong 516000 China Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province Baoding China

Within the basis light-front quantization framework, we compute the masses and light-front wave functions of the Λb baryon and its isospin triplet counterparts Σb+, Σb0, and Σb− using a light-front effective Hamiltonian in the leading Fock sector. These wave functions are obtained as eigenstates of the effective Hamiltonian, which incorporates the one-gluon exchange interaction with fixed coupling and a three-dimensional confinement potential. With the quark masses and the couplings as adjustable parameters, the computed masses are set within the experimental range. The resulting predictions for their electromagnetic properties align well with other theoretical calculations. Additionally, the parton distribution functions (PDFs) of these baryons are obtained for the first time, with gluon and sea quark distributions dynamically generated through QCD evolution of the valence quark PDFs.

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Analysis of the confinement string in (2 + 1)-dimensional Quantum Electrodynamics with a trapped-ion quantum computer

arXiv

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arXiv 2024年

作者： Crippa, Arianna Jansen, Karl Rinaldi, Enrico Deutsches Elektronen-Synchrotron DESY Platanenallee 6 Zeuthen15738 Germany Institut für Physik Humboldt-Universität zu Berlin Newtonstr. 15 Berlin12489 Germany Computation-Based Science and Technology Research Center The Cyprus Institute 20 Kavafi Street Nicosia2121 Cyprus Quantinuum K.K. Financial City Grand Cube 3F Otemachi Chiyoda-ku Tokyo1-9-2 Japan Program RIKEN Saitama Wako351-0198 Japan RIKEN Saitama Wako351-0198 Japan Theoretical Quantum Physics Laboratory Cluster of Pioneering Research RIKEN Wako Saitama351-0198 Japan

Compact lattice Quantum Electrodynamics is a complex quantum field theory with dynamical gauge and matter fields and it has similarities with Quantum Chromodynamics, in particular asymptotic freedom and confinement. We consider a (2+1)-dimensional lattice discretization of Quantum Electrodynamics with the inclusion of dynamical fermionic matter. We define a suitable quantum algorithm to measure the static potential as a function of the distance between two charges on the lattice and we use a variational quantum calculation to explore the Coulomb, confinement and string breaking regimes. A symmetry-preserving and resource-efficient variational quantum circuit is employed to prepare the ground state of the theory at various values of the coupling constant, corresponding to different physical distances, allowing the accurate extraction of the static potential from a quantum computer. We demonstrate that results from quantum experiments on the Quantinuum H1-1 trapped-ion device and emulator, with full connectivity between qubits, agree with classical noiseless simulations using circuits with 10 and 24 qubits. Moreover, we visualize the electric field flux configurations that mostly contribute in the wave-function of the quantum ground state in the different regimes of the potential, thus giving insights into the mechanisms of confinement and string breaking. These results are a promising step forward in the grand challenge of solving higher dimensional lattice gauge theory problems with quantum computing algorithms. Copyright © 2024, The Authors. All rights reserved.

关键词： Ground state

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Measuring Zak phase in room-temperature atoms

arXiv

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arXiv 2021年

作者： Mao, Ruosong Xu, Xingqi Wang, Jiefei Xu, Chenran Qian, Gewei Cai, Han Zhu, Shi-Yao Wang, Da-Wei Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation Zhejiang Province Key Laboratory of Quantum Technology and Device Department of Physics Zhejiang University Hangzhou310027 China College of Optical Science and Engineering Zhejiang University Hangzhou310027 China Hefei National Laboratory Hefei230088 China CAS Center of Excellence in Topological Quantum Computation Beijing100190 China

Cold atoms provide a flexible platform for synthesizing and characterizing topological matter, where geometric phases play a central role. However, cold atoms are intrinsically prone to thermal noise, which can overwhelm the topological response and hamper promised applications. On the other hand, geometric phases also determine the energy spectra of particles subjected to a static force, based on the polarization relation between Wannier-Stark ladders and geometric Zak phases. By exploiting this relation, we develop a method to extract geometric phases from energy spectra of room-temperature superradiance lattices, which are momentum-space lattices of timed Dicke states. In such momentum-space lattices the thermal motion of atoms, instead of being a source of noise, provides effective forces which lead to spectroscopic signatures of the Zak phases. We measure Zak phases directly from the anti-crossings between Wannier-Stark ladders in the Doppler-broadened absorption spectra of superradiance lattices. Our approach paves the way of measuring topological invariants and developing their applications in room-temperature atoms. © 2021, CC BY.

关键词： Atoms

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Quantum Causal Unravelling

arXiv

引用

arXiv 2021年

作者： Bai, Ge Wu, Ya-Dong Zhu, Yan Hayashi, Masahito Chiribella, Giulio QICI Quantum Information and Computation Initiative Department of Computer Science The University of Hong Kong Pokfulam Road Hong Kong HKU-Oxford Joint Laboratory for Quantum Information and Computation United Kingdom Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China Guangdong Provincial Key Laboratory of Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China Graduate School of Mathematics Nagoya University Nagoya464-8602 Japan Department of Computer Science University of Oxford Parks Road OxfordOX1 3QD United Kingdom Perimeter Institute For Theoretical Physics 31 Caroline Street North WaterlooONN2L 2Y5 Canada

Complex processes often arise from sequences of simpler interactions involving a few particles at a time. These interactions, however, may not be directly accessible to experiments. Here we develop the first efficient method for unravelling the causal structure of the interactions in a multipartite quantum process, under the assumption that the process has bounded information loss and induces causal dependencies whose strength is above a fixed (but otherwise arbitrary) threshold. Our method is based on a quantum algorithm whose complexity scales polynomially in the total number of input/output systems, in the dimension of the systems involved in each interaction, and in the inverse of the chosen threshold for the strength of the causal dependencies. Under additional assumptions, we also provide a second algorithm that has lower complexity and requires only local state preparation and local measurements. Our algorithms can be used to identify processes that can be characterized efficiently with the technique of quantum process tomography. Similarly, they can be used to identify useful communication channels in quantum networks, and to test the internal structure of uncharacterized quantum circuits. Copyright © 2021, The Authors. All rights reserved.

关键词： computational complexity

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