Article
Multidisciplinary Sciences
Eslam Khalaf, Shubhayu Chatterjee, Nick Bultinck, Michael P. Zaletel, Ashvin Vishwanath
Summary: Topological solitons play a crucial role in insulating and superconducting behavior in stacked and twisted graphene sheets. Symmetry breaking leads to an ordered insulator, while topological solitons result in a superconductor.
Article
Quantum Science & Technology
Bo -Ye Sun, Nathan Goldman, Monika Aidelsburger, Marin Bukov
Summary: In this work, we propose a scheme to simulate Kitaev's honeycomb model with cold atoms using a periodic (Floquet) drive, aiming to realize and probe non-Abelian chiral spin liquids. We derive the effective Hamiltonian and show that the drive can open a topological gap in the spectrum without mixing the effective Majorana and vortex degrees of freedom. We address the challenge of probing Majorana fermions while only having access to the original composite spin degrees of freedom. Specifically, we propose using gap spectroscopy and edge quenches to detect the properties of the chiral spin liquid phase in the presence of the Floquet drive, and find that the resulting chiral edge signal is robust for realistically prepared states. By combining strong interactions with Floquet engineering, our work paves the way for future studies of non-Abelian excitations and quantized thermal transport using quantum simulators.
Article
Materials Science, Multidisciplinary
Yusuke Masaki, Takeshi Mizushima, Muneto Nitta
Summary: In this paper, the researchers demonstrate the existence and stability of non-Abelian half-quantum vortices (HQVs) in P-3(2) superfluids. They find that a singly quantized vortex is destabilized into a pair of two non-Abelian HQVs and each HQV carries a topologically protected Majorana fermion, characterizing twofold non-Abelian anyons.
Article
Multidisciplinary Sciences
Qinghua Guo, Tianshu Jiang, Ruo-Yang Zhang, Lei Zhang, Zhao-Qing Zhang, Biao Yang, Shuang Zhang, C. T. Chan
Summary: Experimental observation of non-Abelian topological charges and edge states in a PT-symmetric transmission line network, along with the discovery of a non-Abelian quotient relation for the bulk-edge correspondence. This new topological property opens up possibilities for intriguing observable phenomena in the field of material science.
Article
Materials Science, Multidisciplinary
Yu-Hsueh Chen, Ching-Yu Huang, Ying-Jer Kao
Summary: The research proposes a unified scheme to identify phase transitions out of the Z(2) Abelian topological order, including the transition to a non-Abelian chiral spin liquid. By computing the overlap of minimally entangled states, the study demonstrates the transition between Abelian and non-Abelian topological orders, as well as the transformation of anyons in the process. Furthermore, the research shows that both LG and SG states have infinite correlation length in the non-Abelian regime, consistent with the no-go theorem regarding the gaplessness of a chiral PEPS.
Article
Quantum Science & Technology
Tyler D. Ellison, Yu-An Chen, Arpit Dua, Wilbur Shirley, Nathana Tantivasadakarn, Dominic J. Williamson
Summary: We construct Pauli topological subsystem codes characterized by arbitrary two-dimensional Abelian anyon theories and extend the classification of these codes to systems of composite-dimensional qudits. We exemplify the construction using examples based on the Z((1)) (4) anyon theory and the chiral semion theory. Furthermore, we prove that every Abelian anyon theory is a subtheory of a stack of toric codes and a certain family of twisted quantum doubles. We also generalize the concept of translation-invariant topological subsystem codes and define their associated anyon theories in terms of higher-form symmetries.
Article
Multidisciplinary Sciences
Tianshu Jiang, Qinghua Guo, Ruo-Yang Zhang, Zhao-Qing Zhang, Biao Yang, C. T. Chan
Summary: The study presents two new classes of topological charges for four-band non-Abelian topological insulators, revealing significant differences in non-Abelian topological classification for even-band systems. The research illustrates the evolution of bulk topology and edge state distributions in a four-band PT symmetric system, paving the way for further exploration of even-band systems.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Haedong Park, Sang Soon Oh
Summary: This paper discusses the sign flipping issue of non-abelian topological charges in phononic and photonic topological semimetals, and confirms through numerical calculation and visualization that this flipping does not cause any inconsistency in building the quaternion group.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Titas Chanda, Maciej Lewenstein, Jakub Zakrzewski, Luca Tagliacozzo
Summary: We determine the phase diagram of the Abelian-Higgs model in 1+1D on a lattice and find a line of first order phase transitions separating the Higgs region from the confined one. The line terminates in a quantum critical point where the two regions are connected by a smooth crossover. We analyze the critical point and find evidence for its description as the product of two noninteracting systems, but also discover some surprising results that challenge our simple picture.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
S. K. Kanungo, J. D. Whalen, Y. Lu, M. Yuan, S. Dasgupta, F. B. Dunning, K. R. A. Hazzard, T. C. Killian
Summary: This study demonstrates the creation of a synthetic dimension using Rydberg atoms, which supports topological edge states. By engineering the tunneling amplitudes and on-site potentials, the authors successfully realize the one-dimensional Su-Schrieffer-Heeger Hamiltonian, a paradigmatic model of topological matter. The probed band structure reveals symmetry-protected topological edge states at zero energy.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
E. Tirrito, M. Lewenstein, A. Bermudez
Summary: We discover an interesting connection between Lorentz-violating quantum field theories and Hubbard-type models of topological crystalline phases in the context of the standard model extension. We demonstrate that ultracold atoms in optical Raman lattices can be used to explore these models. Specifically, we analyze the Creutz-Hubbard ladder under a magnetic flux and observe a circulating chiral current resulting from a violation of Lorentz invariance. We present a phase diagram including trivial insulators, ferromagnetic and antiferromagnetic phases, and current-carrying topological crystalline phases, which is validated using tools from condensed matter physics and quantum-information science.
Article
Astronomy & Astrophysics
Huan Souza, L. H. S. Ribeiro, A. C. Lehum
Summary: The Gildener-Weinberg models are particularly important in extending the Standard Model of particle physics, including various theories such as double Higgs models, grand unification theories, and proposals for dark matter. Precise experimental results are crucial for testing these models rigorously. This study uses the renormalization group equation and its one-loop functions to gain a deeper understanding of the higher-loop effective potential. The findings show a significant correction in the radiatively generated mass of the light particle in the Gildener-Weinberg approach, and suggest that not all flat directions are equivalent and some may be preferred by nature.
Article
Physics, Particles & Fields
Jens Mund, Rehren Karl-Henning, Bert Schroer
Summary: String-localized quantum field theory can allow renormalizable couplings involving massive vector bosons without negative-norm states and compensating ghosts. The most general coupling of a massive vector boson to a scalar field is analyzed, revealing that the scalar field necessarily possesses a shifted Higgs potential. The shape of the Higgs potential arises as a consistency condition among fundamental principles of QFT, and can be achieved by relaxing the localization properties of auxiliary quantities.
Article
Physics, Multidisciplinary
Hong-Juan Meng, Wen-Yuan Wang, Yu-Ren Shi
Summary: Ultracold atoms in a hexagonal lattice with a synthetic magnetic field exhibit a quantum phase transition and parity effects, depending on atomic interaction and magnetic flux.
Article
Materials Science, Multidisciplinary
Chunping Gao, Zheng Tang, Fei Zhu, Yunbo Zhang, Han Pu, Li Chen
Summary: This paper investigates the impact of local gauge symmetry on quantum thermalization breaking and finds that disorder-free quantum many-body localization and entropy prethermalization can occur in a system with a specific interaction by introducing four-fermion interaction. The interplay between fermion interaction and U(1) gauge symmetry endows gauge fields with disordered potential, leading to anomalous behaviors in the long-time evolution of various quantities. This work provides a different platform to explore emergent nonthermal dynamics in state-of-the-art quantum simulators with gauge symmetries.
Article
Physics, Multidisciplinary
Zheng-An Wang, Yi Peng, Dapeng Yu, Heng Fan
Summary: The metrology scheme reported involves measuring the magnetic susceptibility of an atomic spin ensemble in the x and z directions, producing parameter estimation that exceeds the standard quantum limit. The scheme is robust against measurement fluctuation caused by environmental noise and defects, providing precise estimation of phi based on the number of atomic spins.
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
Physics, Multidisciplinary
Zi-Yong Ge, Rui-Zhen Huang, Zi-Yang Meng, Heng Fan
Summary: This article proposes an implementation to approximately simulate DOUBLE-STRUCK CAPITAL Z(2) lattice gauge theory (LGT) on superconducting quantum circuits. It systematically investigates both the ground state properties and quench dynamics, shedding light on quantum phase transitions and confinement dynamics in LGT. The results pave the way for simulating LGT on superconducting circuits.
