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arXiv 2020年

作者： Mielke, C. Qin, Y. Yin, J.-X. Nakamura, H. Das, D. Guo, K. Khasanov, R. Chang, J. Wang, Z.Q. Jia, S. Nakatsuji, S. Amato, A. Luetkens, H. Xu, G. Hasan, Z.M. Guguchia, Zurab Laboratory for Muon Spin Spectroscopy Paul Scherrer Institute VilligenCH-5232 Switzerland Physik-Institut Universitat Zürich Winterthurerstrasse 190 ZurichCH-8057 Switzerland Wuhan National High Magnetic Field Center School of Physics Huazhong University of Science and Technology Wuhan430074 China Laboratory for Topological Quantum Matter and Spectroscopy Department of Physics Princeton University PrincetonNJ08544 United States Institute for Solid State Physics University of Tokyo Kashiwa277-8581 Japan International Center for Quantum Materials and School of Physics Peking University Beijing China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Science Beijing China Department of Physics Boston College Chestnut HillMA United States

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. 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. Below Tc, µSR reveals isotropic type-II superconductivity, which is robust against hydrostatic pressure up to 2 GPa. Intriguingly, the ratio 2∆/kBTc 4.3 (where ∆ is the superconducting energy gap) is in the strong coupling limit, and Tc/λ−2eff (where λ is the penetration depth) is comparable to that of high-temperature unconventional superconductors. We also find that electron-phonon coupling alone can only reproduce 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 high density of states from narrow kagome bands. Our experiments and calculations taken together point to strong coupling and the unconventional nature of kagome superconductivity in LaRu3Si2. Copyright © 2020, The Authors. All rights reserved.

关键词： Hydrostatic pressure

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Deterministic Entanglement Swapping in a Superconducting Circuit

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Physical Review Letters 2019年第6期123卷 060502-060502页

作者： Wen Ning Xin-Jie Huang Pei-Rong Han Hekang Li Hui Deng Zhen-Biao Yang Zhi-Rong Zhong Yan Xia Kai Xu Dongning Zheng Shi-Biao Zheng Fujian Key Laboratory of Quantum Information and Quantum Optics College of Physics and Information Engineering Fuzhou University Fuzhou Fujian 350108 China Institute of Physics and Beijing National Laboratory for Condensed Matter Physics Chinese Academy of Sciences Beijing 100190 China Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics University of Science and Technology of China Hefei Anhui 230026 China CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui 230026 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China

Entanglement swapping, the process to entangle two particles without coupling them in any way, is one of the most striking manifestations of the quantum-mechanical nonlocal characteristic. Besides fundamental interest, this process has applications in complex entanglement manipulation and quantum communication. Here we report a high-fidelity, unconditional entanglement swapping experiment in a superconducting circuit. The measured concurrence characterizing the qubit-qubit entanglement produced by swapping is above 0.75, confirming most of the entanglement of one qubit with its partner is deterministically transferred to another qubit that has never interacted with it. We further realize delayed-choice entanglement swapping, showing whether two qubits previously behaved as in an entangled state or as in a separable state is determined by a later choice of the type of measurement on their partners. This is the first demonstration of entanglement-separability duality in a deterministic way.

关键词： Entanglement manipulation Quantum benchmarking Quantum entanglement Quantum gates Quantum information architectures & platforms Quantum tomography Superconducting qubits

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Non-local corrections to the typical medium theory of Anderson localization

arXiv

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arXiv 2021年

作者： Terletska, Hanna Moilanen, A. Tam, K.-M. Zhang, Y. Wang, Y. Eisenbach, M. Vidhyadhiraja, N.S. Chioncel, L. Moreno, J. Department of Physics & Astronomy Computational Science Program Middle Tennessee State University MurfreesboroTN37132 United States Department of Physics & Astronomy Louisiana State University Baton RougeLA70803 United States Center for Computation & Technology Louisiana State University Baton RougeLA70803 United States Kavli Institute for Theoretical Sciences University of the Chinese Academy of Sciences Beijing100190 China Pittsburgh Supercomputing Center Carnegie Mellon University PA15213 United States Center for Computational Sciences Oak Ridge National Laboratory Oak RidgeTN37831 United States Theoretical Sciences Unit Jawaharlal Nehru Centre for Advanced Scientific Research Bangalore India Theoretical Physics III Center for Electronic Correlations and Magnetism Institute of Physics University of Augsburg Augsburg Center for Innovative Technologies University of Augsburg AugsburgD-86135 Germany

We use the recently developed finite cluster typical medium approach to study the Anderson localization transition in three dimensions. Applying our method to the box and binary alloy disorder distributions, we find a fast convergence with the cluster size. We demonstrate the importance of the typical medium environment and the non-local spatial correlations for the proper characterization of the localization transition. As the cluster size increases, our typical medium cluster method recovers the correct critical disorder strength for the transition. Our findings highlight the importance of the non-local cluster corrections for capturing the localization behavior of the mobility edge trajectories. Our results demonstrate that the typical medium cluster approach developed here provides a consistent and systematic description of the Anderson localization transition in the framework of the effective medium embedding schemes. © 2021, CC BY.

关键词： Cluster analysis

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Understanding angle-resolved polarized Raman scattering from black phosphorus at normal and oblique laser incidences

arXiv

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arXiv 2020年

作者： Lin, Miao-Ling Leng, Yu-Chen Cong, Xin Meng, Da Wang, Jiahong Li, Xiao-Li Yu, Binlu Liu, Xue-Lu Yu, Xue-Feng Tan, Ping-Heng State Key Laboratory of Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China Center of Materials Science and Optoelectronics Engineering & CAS Center of Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing100049 China Shenzhen Engineering Center for the Fabrication of Two-Dimensional Atomic Crystals Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen518055 China College of Physics Science and Technology Hebei University Baoding071002 China Beijing Academy of Quantum Information Science Beijing100193 China

The selection rule for angle-resolved polarized Raman (ARPR) intensity of phonons from standard group-theoretical method in isotropic materials would break down in anisotropic layered materials (ALMs) due to birefringence and linear dichroism effects. The two effects result in depth-dependent polarization and intensity of incident laser and scattered signal inside ALMs and thus make a challenge to predict ARPR intensity at any laser incidence direction. Herein, taking in-plane anisotropic black phosphorus as a prototype, we developed a so-called birefringence-linear-dichroism (BLD) model to quantitatively understand its ARPR intensity at both normal and oblique laser incidences by the same set of real Raman tensors for certain laser excitation. No fitting parameter is needed, once the birefringence and linear dichroism effects are considered with the complex refractive indexes. An approach was proposed to experimentally determine real Raman tensor and complex refractive indexes, respectively, from the relative Raman intensity along its principle axes and incident-angle resolved reflectivity by Fresnel′s law. The results suggest that the previously reported ARPR intensity of ultrathin ALM flakes deposited on a multilayered substrate at normal laser incidence can be also understood based on the BLD model by considering the depth-dependent polarization and intensity of incident laser and scattered Raman signal induced by both birefringence and linear dichroism effects within ALM flakes and the interference effects in the multilayered structures, which are dependent on the excitation wavelength, thickness of ALM flakes and dielectric layers of the substrate. This work can be generally applicable to any opaque anisotropic crystals, offering a promising route to predict and manipulate the polarized behaviors of related phonons. Copyright © 2020, The Authors. All rights reserved.

关键词： Anisotropy

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Boundary-obstructed topological high-Tc superconductivity in iron pnictides

arXiv

引用

arXiv 2020年

作者： Wu, Xianxin Benalcazar, Wladimir A. Li, Yinxiang Thomale, Ronny Liu, Chao-Xing Hu, Jiangping Department of Physics Pennsylvania State University University ParkPA16802 United States Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China Tin Ka-Ping College of Science University of Shanghai for Science and Technology Shanghai200093 China Institut für Theoretische Physik und Astrophysik Julius-Maximilians-Universität Würzburg Würzburg97074 Germany CAS Center of Excellence in Topological Quantum Computation and Kavli Institute of Theoretical Sciences University of Chinese Academy of Sciences Beijing100190 China

Non-trivial topology and unconventional pairing are two central guiding principles in the contemporary search for and analysis of superconducting materials and heterostructure compounds. Previously, a topological superconductor has been predominantly conceived to result from a topologically non-trivial band subject to intrinsic or external superconducting proximity effect. Here, we propose a new class of topological superconductors which are uniquely induced by unconventional pairing. They exhibit a boundary-obstructed higher-order topological character and, depending on their dimensionality, feature unprecedently robust Majorana bound states or hinge modes protected by chiral symmetry. We predict the 112-family of iron pnictides, such as Ca1−xLaxFeAs2, to be a highly suited material candidate for our proposal, which can be tested by edge spectroscopy. Because of the boundary-obstruction, the topologically non-trivial feature of the 112 pnictides does not reveal itself for a bulk-only torus band analysis without boundaries, and as such had evaded previous investigations. Our proposal not only opens a new arena for highly stable Majorana modes in high-temperature superconductors, but also provides the smoking gun evidence for extended s-wave order in the iron pnictides. Copyright © 2020, The Authors. All rights reserved.

关键词： Topology

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Rücktitelbild: Defect-Free Alternating Conjugated Polymers Enabled by Room- Temperature Stille Polymerization (Angew. Chem. 16/2022)

引用

Angewandte Chemie 2022年第16期134卷

作者： Bowei Ma Qinqin Shi Xiaoying Ma Yawen Li Hao Chen Kaikai Wen Ruihua Zhao Fengjiao Zhang Yuze Lin Zhixiang Wang Hui Huang College of Materials Science and Opto-Electronic Technology & Center of Materials Science and Optoelectronics Engineering & CAS Center for Excellence in Topological Quantum Computation & CAS Key Laboratory of Vacuum Physics University of Chinese Academy of Sciences Beijing 100049 P. R. China School of Chemical Sciences University of Chinese Academy of Sciences Beijing 100049 P. R. China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China

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Defect-Free Alternating Conjugated Polymers Enabled by Room- Temperature Stille Polymerization

引用

Angewandte Chemie 2022年第16期134卷

The Stille cross-coupling polymerization is one of the most efficient synthetic methods for donor–acceptor (D–A) type π-conjugated polymers (CPs). Nevertheless, thermal-activation Stille polymerization readily produced homocoupling defects, resulting in batch-to-batch variations in copolymers quality and deteriorating the device performance of electronics and optoelectronics. Here, a room-temperature Stille-type polymerization was developed, the utility and generality of which were demonstrated by synthesis of twelve D–A CPs with high molecular weights. Importantly, the resultant copolymers possessed no homocoupling (hc) structural defects, while hc reactions were observed in the thermal-activation Stille reactions. Thus, the organic field-effect transistors (OFETs) based on the former exhibited twofold higher charge transport mobility (2.10 cm 2 V −1 s −1 ), since it possessed stronger crystallinity and lower trap density of states (tDOS).

关键词： Alternating Conjugated Polymers Buchwald Precatalyst Homocoupling Defects Room-Temperature Reactions Stille Cross-Coupling Polymerization

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Back Cover: Defect-Free Alternating Conjugated Polymers Enabled by Room- Temperature Stille Polymerization (Angew. Chem. Int. Ed. 16/2022)

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Angewandte Chemie International Edition 2022年第16期61卷

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Decoupling Cross-Quadrature Correlations using Passive Operations

arXiv

引用

arXiv 2020年

作者： Assad, Syed M. Gu, Mile Li, Xiaoying Lam, Ping Koy School of Physical and Mathematical Sciences Nanyang Technological University Singapore639673 Singapore Centre for Quantum Computation and Communication Technology Department of Quantum Science Research School of Physics and Engineering Australian National University CanberraACT2601 Australia Centre for Quantum Technologies National University of Singapore 3 Science Drive 2 Singapore Singapore College of Precision Instrument and Opto-Electronics Engineering Key Laboratory of Opto-Electronics Information Technology Ministry of Education Tianjin University Tianjin300072 China

Quadrature correlations between subsystems of a Gaussian quantum state are fully characterised by its covariance matrix. For example, the covariance matrix determines the amount of entanglement or decoherence of the state. Here, we establish when is it possible to remove correlations between conjugate quadratures using only passive operations. Such correlations are usually undesired and arise due to experimental cross-quadrature contaminations. Using the Autonne–Takagi factorisation, we present necessary and sufficient conditions to determine when such removal is possible. Our proof is constructive and whenever it is possible, we obtain an explicit expression for the required passive operation. Copyright © 2020, The Authors. All rights reserved.

关键词： Covariance matrix

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Multiple uncertainty relation for accelerated quantum information

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Physical Review D 2020年第9期102卷 096009-096009页

作者： Chen Qian Ya-Dong Wu Jia-Wei Ji Yunlong Xiao Barry C. Sanders Shanghai Branch National Laboratory for Physical Sciences at Microscale University of Science and Technology of China Shanghai 201315 China Shanghai Branch CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China Shanghai 201315 China Department of Modern Physics University of Science and Technology of China Hefei 230026 China QICI Quantum Information and Computation Initiative Department of Computer Science The University of Hong Kong Pok Fu Lam Road Hong Kong Institute for Quantum Science and Technology University of Calgary Calgary Alberta T2N 1N4 Canada Nanyang Quantum Hub School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore Complexity Institute Nanyang Technological University Singapore 639673 Singapore Department of Mathematics and Statistics University of Calgary Calgary Alberta T2N 1N4 Canada

The uncertainty principle, first introduced by Heisenberg in inertial frames, clearly distinguishes quantum theories from classical mechanics. In noninertial frames, its information-theoretic expressions, namely, entropic uncertainty relations, have been extensively studied through delocalized quantum fields, and localization of the quantum fields were discussed as well. However, infeasibility of measurements applied on a delocalized quantum field due to the finite size of measurement apparatuses is left unexplained. Therefore, physical clarification of a quantum protocol revealing entropic uncertainty relations still needs investigation. Building on advances in quantum field theories and theoretical developments in entropic uncertainty relations, we demonstrate a relativistic protocol of an uncertainty game in the presence of localized fermionic quantum fields inside cavities. Moreover, a novel lower bound for entropic uncertainty relations with multiple quantum memories is given in terms of the Holevo quantity, which implies how acceleration affects uncertainty relations.

关键词： Entanglement in field theory Nonlocality Quantum memories

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