Article
Optics
Jeong Ho Han, Dalmin Bae, Y. Shin
Summary: This study describes a synthetic three-leg Hall ladder system with a tunable magnetic flux for neutral Yb-173 atoms in a one-dimensional optical lattice. The controllable magnetic flux is achieved through Raman couplings between spin states, and the quench dynamics of the system were investigated under various interleg link configurations, showing substantial damping in certain cases.
Article
Physics, Multidisciplinary
Deepak Gaur, Hrushikesh Sable, D. Angom
Summary: In this research, we investigate the bosonic fractional quantum Hall (FQH) states in a two-dimensional optical lattice with a synthetic magnetic field, described by the bosonic Harper-Hofstadter Hamiltonian. We utilize cluster Gutzwiller mean-field and exact diagonalization techniques to study these states. We observe incompressible states resembling FQH states at various filling factors. Our particular focus is on the nu = 1/2 FQH state, characterized by the two-point correlation function and the many-body Chern number. Furthermore, we examine the impact of dipolar interaction on the nu = 1/2 FQH state, finding that it stabilizes the FQH state against the competing superfluid state.
FRONTIERS IN PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Wei-Tao Lu, Qing-Feng Sun, Yun-Fang Li, Hong-Yu Tian
Summary: Through adjusting the side potential and ribbon width, different spin- and valley-related electronic properties, such as quantum spin-valley Hall effect and spin-polarized quantum anomalous Hall effect, can be achieved in 2D honeycomb lattices with intrinsic spin-orbit coupling. The results indicate that the side potential has a significant impact on helical edge states, spins with different indices, and the locking of spin and valley.
Article
Physics, Multidisciplinary
Zhao Liu, Ahmed Abouelkomsan, Emil J. Bergholtz
Summary: Twisted double bilayer graphene is predicted to be a versatile platform for realizing fractional Chern insulators at high temperatures, without the need for an external magnetic field, by tuning the gate potential and twist angle.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Ke Huang, Hailong Fu, Danielle Reifsnyder Hickey, Nasim Alem, Xi Lin, Kenji Watanabe, Takashi Taniguchi, Jun Zhu
Summary: In this study, we investigate the control over valley isospin degrees of freedom in bilayer graphene using a perpendicular electric field. We observe a new even-denominator fractional quantum Hall state at filling factor v = 5/2 and the appearance of predicted daughter states and anti-Pfaffian states. These findings pave the way for manipulating valley isospin in bilayer graphene to engineer exotic topological orders and quantum information processes.
Article
Materials Science, Multidisciplinary
Qing-Wei Wang
Summary: The dynamical correlations of hard-core anyons in one-dimensional lattices are studied in this paper. Exact expressions for the Green's function, the spectral function, and the out-of-time-ordered correlators are obtained. Three main singularity lines are observed in the anyonic spectral function, which correspond to a peak in the momentum distribution function and a power-law singularity in the local spectral function. The anyonic statistics also induce spatial asymmetry in the correlations. Light-cone dynamics are observed in the information spreading characterized by the out-of-time-ordered correlators.
Article
Materials Science, Multidisciplinary
Haishan Tian, Yang Yang, Jiao Tang, Leyong Jiang, Yuanjiang Xiang
Summary: A multilayer structure is proposed to enhance the photonic spin hall effect of the reflected light at terahertz frequencies by controlling the Fermi energy and relaxation time of graphene. It is demonstrated that the spin behavior of the composite structure is highly sensitive to the incidence angle and dispersion characteristics of the spacer layer. This proposed structure shows great potential for designing new photonic devices based on the photonic spin hall effect at terahertz band.
RESULTS IN PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Sujit Narayanan, Malcolm P. Kennett
Summary: We study the collective excitations of fractional quantum Hall states in graphene, focusing on states allowing for chiral symmetry breaking orders, such as antiferromagnetism and charge density wave order. Numerical investigations are conducted to explore how the collective excitation spectra depend on filling and the flux attachment scheme for two classes of variational states, namely the Toke-Jain sequence and the Modak-Mandal-Sengupta sequence.
Article
Nanoscience & Nanotechnology
Corentin Deprez, Louis Veyrat, Hadrien Vignaud, Goutham Nayak, Kenji Watanabe, Takashi Taniguchi, Frederic Gay, Hermann Sellier, Benjamin Sacepe
Summary: This study demonstrates high-mobility monolayer graphene as an alternative material system for Fabry-Perot quantum Hall interference in the integer quantum Hall regime, allowing for high-visibility Aharonov-Bohm interference tunable through electrostatic gating or magnetic fields. The coherence length of graphene devices at low temperatures enables coherently coupled double Fabry-Perot interferometry and potential investigations into anyonic excitations in fractional quantum Hall states in the future.
NATURE NANOTECHNOLOGY
(2021)
Article
Acoustics
Milan Cajic, Danilo Karlicic, Johan Christensen, Sondipon Adhikari
Summary: This study investigates the topological properties of acoustic metamaterials with multiple masses, internal resonators, and inerter elements. By analyzing the winding numbers and signs of band gaps, the topological characteristics of lattice band structures are assessed, along with the effects of embedding inerter elements. The results show that the proposed diatomic-like and triatomic-like mass-in-mass chains can generate multiple interface modes, and the introduction of inerters and local resonators can significantly modify the frequency values of band gaps and interface modes.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Optics
Maximilian Buser, Ulrich Schollwoeck, Fabian Grusdt
Summary: Quantum simulators are gaining attention for their ability to reveal the behavior of quantum many-body systems that cannot be simulated classically. This study focuses on the behavior of particle currents in quantum lattice models with a conserved number of particles, and investigates the Hall response of interacting bosonic flux ladders. The results show that the full probability distribution of locally resolved particle currents can be obtained from suitable snapshot data, and the Hall polarization and Hall voltage can be accurately computed from experimentally feasible snapshots.
Article
Multidisciplinary Sciences
M. Hashisaka, T. Jonckheere, T. Akiho, S. Sasaki, J. Rech, T. Martin, K. Muraki
Summary: The researchers observed an Andreev-like process in a narrow junction between fractional and integer quantum Hall states, originating from a topological quantum many-body effect rather than superconductivity, demonstrating the microscopic charge dynamics at the boundaries of topological quantum many-body states.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Fangyang Zhan, Junjie Zeng, Zhuo Chen, Xin Jin, Jing Fan, Tingyong Chen, Rui Wang
Summary: We propose that Floquet engineering can be used to realize the nonequilibrium quantum anomalous Hall effect (QAHE) with tunable Chern number. By irradiating circularly polarized light (CPL), the hybridization of Floquet sidebands in the two-dimensional family MSi2Z4 can lead to the formation of QAHE related to valley polarization (VP-QAHE). The Chern number of VP-QAHE can be highly tunable by adjusting the frequency, intensity, and handedness of CPL, allowing for the exploration of emergent topological phases under light irradiation.
Article
Physics, Multidisciplinary
Ziyu Liu, Ursula Wurstbauer, Lingjie Du, Ken W. West, Loren N. Pfeiffer, Michael J. Manfra, Aron Pinczuk
Summary: This study investigates the impacts of domain textures on low-lying neutral excitations in bulk fractional quantum Hall effect (FQHE) systems using resonant inelastic light scattering. The research demonstrates that large domains of quantum fluids support long-wavelength neutral collective excitations with well-defined wave vector dispersion, which can be explained by theories for uniform phases. The accessibility of dispersive low-lying neutral collective modes, such as long wavelength magnetorotons at filling factor v = 1/3, in large domains of FQHE fluids offers significant experimental access to strong electron correlation physics in the FQHE.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Applied
Xin Yang, Yanqing Shen, Jiajia Liu, Lingling Lv, Min Zhou, Yu Zhang, Xianghui Meng, Zhongxiang Zhou, Yangdong Zheng
Summary: The topologically nontrivial phase and quantum anomalous Hall (QAH) effect were predicted in the ferromagnetic non-Dirac half-metal N2Pd4S6 monolayer using first-principles calculations. The N2Pd4S6 monolayer prefers out-of-plane magnetization and exhibits a Curie temperature of similar to 80 K due to dual double-exchange interaction. The introduction of magnetic exchange and spin-orbit coupling enables the realization of the topologically nontrivial phase and QAH state, as well as the unique quantum anomalous valley Hall (QAVH) effect induced by compressive strain.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Shou-Kuan Zhao, Zi-Yong Ge, Zhong-Cheng Xiang, Guang-Ming Xue, Hai-Sheng Yan, Zi-Ting Wang, Zhan Wang, Hui-Kai Xu, Fei-Fan Su, Zhao-Hua Yang, He Zhang, Yu-Ran Zhang, Xue-Yi Guo, Kai Xu, Ye Tian, Hai-Feng Yu, Dong-Ning Zheng, Heng Fan, Shi-Ping Zhao
Summary: The Loschmidt echo is a useful diagnostic tool for evaluating the perfection of quantum time-reversal processes and the sensitivity of quantum evolution to small perturbations. In this study, we measured the Loschmidt echo in a superconducting 10-qubit system using Floquet engineering and discussed the imperfection of initial Bell-state recovery caused by the next-nearest-neighbor (NNN) coupling in the qubit device. Our results demonstrate that the Loschmidt echo is highly sensitive to small perturbations during quantum-state evolution, which can be employed to investigate aspects such as many-body decoherence and entanglement in multiqubit systems.
Article
Physics, Multidisciplinary
Qingling Zhu, Zheng-Hang Sun, Ming Gong, Fusheng Chen, Yu-Ran Zhang, Yulin Wu, Yangsen Ye, Chen Zha, Shaowei Li, Shaojun Guo, Haoran Qian, He-Liang Huang, Jiale Yu, Hui Deng, Hao Rong, Jin Lin, Yu Xu, Lihua Sun, Cheng Guo, Na Li, Futian Liang, Cheng-Zhi Peng, Heng Fan, Xiaobo Zhu, Jian-Wei Pan
Summary: Understanding phenomena in nonequilibrium dynamics of closed quantum many-body systems is crucial. This study uses a ladder-type superconducting quantum processor to simulate different models and reveals quantum thermalization and information scrambling. The controllable qubit ladder shows ergodicity and scrambling.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Kai Xu, Yu-Ran Zhang, Zheng-Hang Sun, Hekang Li, Pengtao Song, Zhongcheng Xiang, Kaixuan Huang, Hao Li, Yun-Hao Shi, Chi-Tong Chen, Xiaohui Song, Dongning Zheng, Franco Nori, H. Wang, Heng Fan
Summary: Multipartite entangled states are important resources for quantum information processing and quantum metrology. Non-Gaussian entangled states are predicted to achieve higher precision measurements than Gaussian states. In this study, a 19-qubit superconducting processor was used to characterize multiparticle entangled states generated during nonlinear dynamics. The linear Ramsey squeezing parameter (RSP) and nonlinear squeezing parameter (NLSP) were measured, and a large metrological gain over the standard quantum limit was observed, indicating a high level of multiparticle entanglement for quantum-enhanced phase sensitivity. The superconducting processor provides an ideal platform for engineering and benchmarking non-Gaussian entangled states.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Ming-Liang Hu, Jia-Ru Wang, Heng Fan
Summary: This study investigates how many observers can share the nonlocal advantage of quantum coherence in a (d x d)-dimensional state. The results show that, in a given scenario, at most one observer can demonstrate this nonlocal advantage with Bob.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2022)
Review
Physics, Multidisciplinary
Kai Xu, Heng Fan
Summary: This article reviews the research progress on noisy multiqubit quantum computation and quantum simulation, focusing on multiqubit state generations, quantum computational advantage, and simulating physics of quantum many-body systems. The perspectives of near term noisy intermediate-quantum processors are also discussed.
Article
Chemistry, Physical
Kaixuan Huang, Xiaoxia Cai, Hao Li, Zi-Yong Ge, Ruijuan Hou, Hekang Li, Tong Liu, Yunhao Shi, Chitong Chen, Dongning Zheng, Kai Xu, Zhi-Bo Liu, Zhendong Li, Heng Fan, Wei-Hai Fang
Summary: Simulating the response properties of molecules is essential for materials design, but it is a challenging task for classical computers. In this study, a practical variational quantum response (VQR) algorithm is introduced to simulate response properties without the need for deep quantum circuits. By using this algorithm on a superconducting quantum processor, the first simulation of linear response properties of molecules, including dynamic polarizabilities and absorption spectra, is reported. The results suggest that near-term quantum hardware can achieve important dynamical properties with suitable error mitigation techniques.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Physics, Multidisciplinary
Chi-Tong Chen, Yun-Hao Shi, Zhongcheng Xiang, Zheng-An Wang, Tian-Ming Li, Hao-Yu Sun, Tian-Shen He, Xiaohui Song, Shiping Zhao, Dongning Zheng, Kai Xu, Heng Fan
Summary: In this study, we present an online public quantum computation platform called ScQ, which utilizes a 1D array of a 10-qubit superconducting processor. The platform allows for single-qubit rotations and controlled-NOT gates between neighboring qubits. We demonstrate the online preparation and verification of Greenberger-Horne-Zeilinger states of up to 10 qubits using ScQ, and provide details on the graphical user interface and quantum assembly language methods. We also present the performance of the quantum computation platform, including the fidelities of logic gates and superconducting device details.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2022)
Editorial Material
Physics, Multidisciplinary
Ming-Liang Hu, Heng Fan
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2022)
Article
Multidisciplinary Sciences
Tong Liu, Shang Liu, Hekang Li, Hao Li, Kaixuan Huang, Zhongcheng Xiang, Xiaohui Song, Kai Xu, Dongning Zheng, Heng Fan
Summary: The authors used a fully connected superconducting quantum processor with up to 15 qubits to confirm the interesting phenomenology of entanglement phase diagrams of Haar-measure random states, including entanglement phase transitions. Random quantum states are powerful tools in various scientific fields, and it has been theoretically predicted that entanglement transitions can occur for different partitions of multipartite random quantum states. This experimental study demonstrates entanglement transitions using negativity as the witness in a fully connected superconducting processor.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Wei-Bin Yan, Ying-Jie Zhang, Zhong-Xiao Man, Heng Fan, Yun-Jie Xia
Summary: A novel quantum-optics scheme for supervised learning is proposed based on the excellent control of single photons realized by atom-photon-chiral couplings. The single-photon rotating and phase-shift operations, which can be controlled by another single photon, are achieved by proper atom-photon-chiral couplings. Moreover, an algorithm is implemented to perform the supervised learning tasks by integrating the realized gates and adjusting the gate parameters.
ANNALEN DER PHYSIK
(2023)
Article
Physics, Multidisciplinary
Yun-Hao Shi, Yu Liu, Yu-Ran Zhang, Zhongcheng Xiang, Kaixuan Huang, Tao Liu, Yong-Yi Wang, Jia-Chi Zhang, Cheng-Lin Deng, Gui-Han Liang, Zheng-Yang Mei, Hao Li, Tian-Ming Li, Wei-Guo Ma, Hao-Tian Liu, Chi-Tong Chen, Tong Liu, Ye Tian, Xiaohui Song, Kai Xu, Dongning Zheng, Franco Nori, Heng Fan
Summary: This study develops a one-dimensional 43-qubit superconducting quantum processor called Chuang-tzu, which is used to simulate and characterize emergent topological states. The quantum processor is capable of capturing important topological features of quantum systems, providing a new method for studying quantum topological systems in the NISQ era.
PHYSICAL REVIEW LETTERS
(2023)
Article
Quantum Science & Technology
Wen Ning, Ri-Hua Zheng, Yan Xia, Kai Xu, Hekang Li, Dongning Zheng, Heng Fan, Fan Wu, Zhen-Biao Yang, Shi-Biao Zheng
Summary: This study reveals a more fundamental and universal interference behavior beyond Zitterbewegung in phase space for Dirac particles, which is confirmed by both numerical simulation and on-chip experiment. This discovery is of fundamental importance in science and holds potential applications in quantum technology.
NPJ QUANTUM INFORMATION
(2023)
Article
Optics
Li -Hang Ren, Yun-Hao Shi, Jin-Jun Chen, Heng Fan
Summary: We propose generalized state-dependent entropic uncertainty relations, obtaining the optimal lower bound by considering different measurement sequences. We apply this relation to detect entanglement, giving experimentally accessible lower bounds on both bipartite and tripartite entanglements. We demonstrate the detection of multipartite entanglement up to ten qubits using the QUAFU cloud quantum computation platform.
Article
Materials Science, Multidisciplinary
Chao Han, Zhao Liu
Summary: We investigate disorder-driven phase transitions in bosonic fractional quantum Hall liquids and identify the critical disorder strengths for different filling factors. The results show a clear transition from the bosonic Laughlin state to a trivial insulating phase at f = 1/2, and a direct phase transition from the non-Abelian bosonic Moore-Read state to a trivial insulating phase at f = 1.
Article
Materials Science, Multidisciplinary
Chao Han, Zhao Liu
Summary: In this study, we investigate the microscopic properties of quasiholes in bosonic fractional quantum Hall (FQH) liquids at nu = 1/2 filling factor with anisotropic band mass tensors. We characterize the shape and anisotropy of a quasihole using the spatial density profile and compare it with the intrinsic geometric metric of the system. We find that the anisotropy of the quasihole increases with the anisotropy of the band mass tensor and exhibits similar dynamics to the intrinsic metric when the system is driven out of equilibrium. Our findings suggest that the density profile of a quasihole can be used to estimate the intrinsic metric and capture the dynamics of an FQH system.
