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Demonstrating a Long-Coherence Dual-Rail Erasure Qubit Using Tunable Transmons

Physical Review X 2024年第1期14卷 011051-011051页

作者： H. Levine A. Haim J. S. C. Hung N. Alidoust M. Kalaee L. DeLorenzo E. A. Wollack P. Arrangoiz-Arriola A. Khalajhedayati R. Sanil H. Moradinejad Y. Vaknin A. Kubica D. Hover S. Aghaeimeibodi J. A. Alcid C. Baek J. Barnett K. Bawdekar P. Bienias H. A. Carson C. Chen L. Chen H. Chinkezian E. M. Chisholm A. Clifford R. Cosmic N. Crisosto A. M. Dalzell E. Davis J. M. D’Ewart S. Diez N. D’Souza P. T. Dumitrescu E. Elkhouly M. T. Fang Y. Fang S. Flammia M. J. Fling G. Garcia M. K. Gharzai A. V. Gorshkov M. J. Gray S. Grimberg A. L. Grimsmo C. T. Hann Y. He S. Heidel S. Howell M. Hunt J. Iverson I. Jarrige L. Jiang W. M. Jones R. Karabalin P. J. Karalekas A. J. Keller D. Lasi M. Lee V. Ly G. MacCabe N. Mahuli G. Marcaud M. H. Matheny S. McArdle G. McCabe G. Merton C. Miles A. Milsted A. Mishra L. Moncelsi M. Naghiloo K. Noh E. Oblepias G. Ortuno J. C. Owens J. Pagdilao A. Panduro J.-P. Paquette R. N. Patel G. Peairs D. J. Perello E. C. Peterson S. Ponte H. Putterman G. Refael P. Reinhold R. Resnick O. A. Reyna R. Rodriguez J. Rose A. H. Rubin M. Runyan C. A. Ryan A. Sahmoud T. Scaffidi B. Shah S. Siavoshi P. Sivarajah T. Skogland C.-J. Su L. J. Swenson J. Sylvia S. M. Teo A. Tomada G. Torlai M. Wistrom K. Zhang I. Zuk A. A. Clerk F. G. S. L. Brandão A. Retzker O. Painter AWS Center for Quantum Computing Pasadena California 91125 USA Institute of Applied Physics The Hebrew University of Jerusalem Jerusalem 91904 Givat Ram Israel Racah Institute of Physics The Hebrew University of Jerusalem Jerusalem 91904 Givat Ram Israel Centre for Engineered Quantum Systems School of Physics The University of Sydney Sydney New South Wales 2006 Australia Pritzker School of Molecular Engineering University of Chicago Chicago Illinois 60637 USA Institute for Quantum Information and Matter California Institute of Technology Pasadena California 91125 USA Department of Physics California Institute of Technology Pasadena California 91125 USA Thomas J. Watson Sr. Laboratory of Applied Physics and Kavli Nanoscience Institute California Institute of Technology Pasadena California 91125 USA

quantum error correction with erasure qubits promises significant advantages over standard error correction due to favorable thresholds for erasure errors. To realize this advantage in practice requires a qubit for which nearly all errors are such erasure errors, and the ability to check for erasure errors without dephasing the qubit. We demonstrate that a “dual-rail qubit” consisting of a pair of resonantly coupled transmons can form a highly coherent erasure qubit, where transmon T1 errors are converted into erasure errors and residual dephasing is strongly suppressed, leading to millisecond-scale coherence within the qubit subspace. We show that single-qubit gates are limited primarily by erasure errors, with erasure probability perasure=2.19(2)×10−3 per gate while the residual errors are ∼40 times lower. We further demonstrate midcircuit detection of erasure errors while introducing <0.1% dephasing error per check. Finally, we show that the suppression of transmon noise allows this dual-rail qubit to preserve high coherence over a broad tunable operating range, offering an improved capacity to avoid frequency collisions. This work establishes transmon-based dual-rail qubits as an attractive building block for hardware-efficient quantum error correction.

关键词： quantum computation quantum error correction quantum information with solid state qubits

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Magneto-Optical Analysis of Magnetic Anisotropy in Ultrathin Tm3Fe5O12/Pt Bilayers

arXiv

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arXiv 2025年

作者： Nunley, T. Nathan Russell, Daniel Chang, Liang-Juan Lujan, David Choe, Jeongheon Guo, Side Lee, Shang-Fan Yang, Fengyuan Li, Xiaoqin Department of Physics Center of Complex Quantum Systems The University of Texas at Austin AustinTX78712 United States Center for Dynamics and Control of Materials Texas Materials Institute The University of Texas at Austin AustinTX78712 United States Department of Physics The Ohio State University ColumbusOH43210 United States Institute of Space Systems Engineering National Yang-Ming Chiao-Tung University Hsinchu30010 Taiwan Institute of Physics Academia Sinica Taipei11529 Taiwan

Magnetic bilayers consisting of an epitaxially grown ferrimagnetic insulator and a heavy metal layer are attractive for spintronic application because of the opportunity for electric control and read-out of spin textures via spin orbit torque. Here, we investigate ultrathin thulium iron garnet (TmIG)/Pt bilayers when the TmIG layer thickness is 3 nm and below using a sensitive Sagnac magneto-optical Kerr effect technique. We compare the hysteresis loops from out-of-plane and in-plane applied magnetic fields. The preferred magnetization orientation evolves with the TmIG thickness and the presence of the Pt overlayer. We quantify the evolution of the magnetic anisotropy in these ultrathin films and find a significant change even when the TmIG thickness is varied by less than 1 nm. In these ultrathin films, the presence of a Pt overlayer changes the effective anisotropy field by more than a factor of 2, suggesting that the interfacial anisotropy at the Pt/TmIG interface plays a critical role in this regime. © 2025, CC BY.

关键词： Ultrathin films

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Orbital Magneto-Nonlinear Anomalous Hall Effect in Kagome Magnet Fe3Sn2

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Physical Review Letters 2024年第10期132卷 106601-106601页

作者： Lujunyu Wang Jiaojiao Zhu Haiyun Chen Hui Wang Jinjin Liu Yue-Xin Huang Bingyan Jiang Jiaji Zhao Hengjie Shi Guang Tian Haoyu Wang Yugui Yao Dapeng Yu Zhiwei Wang Cong Xiao Shengyuan A. Yang Xiaosong Wu State Key Laboratory for Artificial Microstructure and Mesoscopic Physics Frontiers Science Center for Nano-optoelectronics Peking University Beijing 100871 China Research Laboratory for Quantum Materials Singapore University of Technology and Design Singapore 487372 Singapore Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China School of Sciences Great Bay University Dongguan 523000 China Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of Technology Beijing 100081 China Material Science Center Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen 518055 China Institute of Applied Physics and Materials Engineering University of Macau Taipa Macau China Department of Physics The University of Hong Kong Hong Kong China HKU-UCAS Joint Institute of Theoretical and Computational Physics at Hong Kong China Collaborative Innovation Center of Quantum Matter Beijing 100871 China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010 Jiangsu China

It has been theoretically predicted that perturbation of the Berry curvature by electromagnetic fields gives rise to intrinsic nonlinear anomalous Hall effects that are independent of scattering. Two types of nonlinear anomalous Hall effects are expected. The electric nonlinear Hall effect has recently begun to receive attention, while very few studies are concerned with the magneto-nonlinear Hall effect. Here, we combine experiment and first-principles calculations to show that the kagome ferromagnet Fe3Sn2 displays such a magneto-nonlinear Hall effect. By systematic field angular and temperature-dependent transport measurements, we unambiguously identify a large anomalous Hall current that is linear in both applied in-plane electric and magnetic fields, utilizing a unique in-plane configuration. We clarify its dominant orbital origin and connect it to the magneto-nonlinear Hall effect. The effect is governed by the intrinsic quantum geometric properties of Bloch electrons. Our results demonstrate the significance of the quantum geometry of electron wave functions from the orbital degree of freedom and open up a new direction in Hall transport effects.

关键词： Anomalous Hall effect Electronic structure Topological materials Kagome lattice Soft magnets Weyl semimetal

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Observation of coherent oscillations in the association of dimers from a thermal gas of ultracold atoms

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Physical Review A 2023年第3期107卷 L031304-L031304页

作者： Roy Elbaz Yaakov Yudkin P. Giannakeas Jan-Michael Rost Chris H. Greene Lev Khaykovich Department of Physics QUEST Center and Institute of Nanotechnology and Advanced Materials Bar-Ilan University Ramat-Gan 5290002 Israel Max Planck Institute for the Physics of Complex Systems Nöthnitzer Strasse 38 01187 Dresden Germany Department of Physics and Astronomy Purdue University West Lafayette Indiana 47907 USA Purdue Quantum Science and Engineering Institute Purdue University West Lafayette Indiana 47907 USA

We report the observation of coherent oscillations in conversion efficiency of weakly bound dimers formed from a thermal gas of ultracold atoms. Finite thermal energy of the gas causes loss of coherence when a broad continuum is resonantly coupled to a discrete bound state. Restoration of the coherence can be achieved through nonadiabatic transitions of the dressed molecular energy level that are induced by a strong modulation pulse with fast envelope dynamics. Conditions to observe coherent oscillations are verified and control of their properties is demonstrated. The main experimental findings are supported by theoretical modeling and numerical calculations. The observed results may lead to a renewed interest in general studies of a discrete energy level coupled to a broadband continuum when the properties of both are fully controlled.

关键词： Ultracold collisions Atomic gases Feshbach resonance

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Reshaping the Cortical Connectivity Gradient by Long-Term Cognitive Training During Development

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Neuroscience Bulletin 2024年第1期40卷 50-64页

作者： Tianyong Xu Yunying Wu Yi Zhang Xi-Nian Zuo Feiyan Chen Changsong Zhou Bio-X Laboratory School of PhysicsZhejiang UniversityHangzhou 310027China Qiushi Academy for Advanced Studies Zhejiang UniversityHangzhou 310027China State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China State Key Laboratory of Cognitive Neuroscience and Learning Bejing Normal UniversityBeijing 100875China Developmental Population Neuroscience Research Center IDG/McGovern Institute for Brain ResearchBeijing Normal UniversityBeijing 100875China Zhejiang Province Key Laboratory of Quantum Technology and Devices Zhejiang UniversityHangzhou 310027China Department of Physics Centre for Nonlinear Studies and Beijing-Hong Kong-Singapore Joint Centre for Nonlinear and Complex Systems(Hong Kong)Institute of Computational and Theoretical StudiesHong Kong Baptist UniversityHong Kong 999077China

The organization of the brain follows a topologi-cal hierarchy that changes dynamically during ***,it remains unknown whether and how cognitive training administered over multiple years during develop-ment can modify this hierarchical *** measuring the brain and behavior of school children who had carried out abacus-based mental calculation(AMC)training for five years(starting from 7 years to 12 years old)in pre-training and post-training,we revealed the reshaping effect of long-term AMC intervention during development on the brain hierarchical *** observed the development-induced emergence of the default network,AMC training-promoted shifting,and regional changes in cortical ***,the training-induced gradient changes were located in visual and somatomotor areas in association with the visuospatial/motor-imagery *** found that gradient-based features can predict the math ability within *** findings provide novel insights into the dynamic nature of network recruitment impacted by long-term cognitive training during development.

关键词： Connectivity gradient Cognitive training Development Neural plasticity Abacus-based mental calculation

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Revealing spontaneous symmetry breaking in continuous time crystals

arXiv

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arXiv 2024年

作者： Tang, Yuanjiang Wang, Chenyang Liu, Bei Peng, Jin Liang, Chao Li, Yaohua Zhao, Xian Lu, Cuicui Zhang, Shuang Liu, Yong-Chun State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Beijing100084 China Shandong University Qingdao266237 China Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of Education Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems Center for Interdisciplinary Science of Optical Quantum and NEMS Integration School of Physics Beijing Institute of Technology Beijing100081 China Department of Physics University of Hong Kong 999077 Hong Kong Department of Electrical and Electronic Engineering University of Hong Kong 999077 Hong Kong Quantum Science Center of Guangdong-Hong Kong-Macao Great Bay Area 3 Binlang Road Shenzhen China Frontier Science Center for Quantum Information Beijing100084 China

Spontaneous symmetry breaking plays a pivotal role in physics ranging from the emergence of elementary particles to the phase transitions of matter. The spontaneous breaking of continuous time translation symmetry leads to a novel state of matter named continuous time crystal (CTC). It exhibits periodic oscillation without the need for periodic driving, and the relative phases for repetitively realized oscillations are random. However, the mechanism behind the spontaneous symmetry breaking in CTCs, particularly the random phases, remains elusive. Here we propose and experimentally realize two types of CTCs based on distinct mechanisms: manifold topology and near-chaotic motion. We observe both types of CTCs in thermal atomic ensembles by artificially synthesizing spin-spin nonlinear interactions through a measurement-feedback scheme. Our work provides general recipes for the realization of CTCs, and paves the way for exploring CTCs in various systems. Copyright © 2024, The Authors. All rights reserved.

关键词： Continuous time systems

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Stability of emergent time periodicity in a few-body interacting system

arXiv

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arXiv 2024年

作者： Campbell, Steve Eisert, Jens Guarnieri, Giacomo School of Physics University College Dublin Belfield Dublin 4 Ireland Centre for Quantum Engineering Science and Technology University College Dublin Dublin 4 Ireland Dahlem Center for Complex Quantum Systems Freie Universität Berlin Berlin14195 Germany Department of Physics University of Pavia Via Bassi 6 Pavia27100 Italy

Dissipative time crystals are many-body open quantum systems that exhibit non-trivial time periodic motion at late times. We examine the onset and resilience of such emergent time periodicity in a few-body all-to-all interacting Lipkin-Meshkov-Glick model, where one of the constituents is locally in contact with a thermal bath. Employing both a collision model framework and a suitable time-continuous description, we show that stable time-crystalline behavior can only be exhibited when the bath acts as purely dissipative channel. We assess the role that the microscopic interactions within the system play, establishing that for the all-to-all model the introduction of temperature leads to a melting of the dissipative time crystallinity, in contrast to stable long-time periodicity which can be maintained for nearest neighbor XXZ type interactions. © 2024, CC BY.

关键词： quantum optics

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Equilibrium and nonequilibrium dynamics of a hole in a bilayer antiferromagnet

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Physical Review B 2022年第15期106卷 155160-155160页

作者： Jens H. Nyhegn Kristian K. Nielsen Georg M. Bruun Center for Complex Quantum Systems Department of Physics and Astronomy Aarhus University Ny Munkegade DK-8000 Aarhus C Denmark Max-Planck Institute for Quantum Optics Hans-Kopfermann-Strasse 1 D-85748 Garching Germany Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology Shenzhen 518055 China

The dynamics of charge carriers in lattices of quantum spins is a long standing and fundamental problem. Recently, a new generation of quantum simulation experiments based on atoms in optical lattices has emerged that gives unprecedented insights into the detailed spatial and temporal dynamics of this problem, which compliments earlier results from condensed matter experiments. Focusing on observables accessible in these new experiments, we explore here the equilibrium as well as nonequilibrium dynamics of a mobile hole in two coupled antiferromagnetic spin lattices. Using a self-consistent Born approximation, we calculate the spectral properties of the hole in the bilayer and extract the energy bands of the quasiparticles, corresponding to magnetic polarons that are either symmetric or antisymmetric under layer exchange. These two kinds of polarons are degenerate at certain momenta due to the antiferromagnetic symmetry, and we, furthermore, examine how the momentum of the ground-state polaron depends on the interlayer coupling strength. The long time dynamics of a hole initially created in one layer is shown to be characterized by oscillations between the two layers with a frequency given by the energy difference between the symmetric and the antisymmetric polaron. We finally demonstrate that the expansion velocity of a hole initially created at a given lattice site is governed by the ballistic motion of polarons for long times, and that it increases as a quantum phase transition to a disordered state is approached. While our linear spin wave theory does not include interlayer dimer correlations important close to the phase transition, this speedup is a physically robust prediction as it reflects the decreasing energy cost of hopping when the magnetic order decreases.

关键词： Antiferromagnetism Cold gases in optical lattices Impurities Polarons quantum field theory Spin waves Antiferromagnets Cuprates Strongly correlated systems Diagrammatic methods Holstein-Primakoff method Nonperturbative methods t-J model

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Observation of Oriented Landau Levels and Helical Zero Modes in Berry Dipole Acoustic Crystals

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Physical Review Letters 2025年第11期134卷 116604-116604页

作者： Qingyang Mo Riyi Zheng Cuicui Lu Xueqin Huang Zhengyou Liu Shuang Zhang New Cornerstone Science Laboratory Department of Physics University of Hong Kong 999077 Hong Kong China School of Physics and Optoelectronics South China University of Technology Guangzhou Guangdong 510640 China Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of Education Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems Center for Interdisciplinary Science of Optical Quantum and NEMS Integration School of Physics School of Physics Beijing Institute of Technology Beijing 100081 China Key Laboratory of Artificial Micro- and Nanostructures of Ministry of Education and School of Physics and Technology Wuhan University Wuhan 430072 China Department of Electrical and Electronic Engineering University of Hong Kong 999077 Hong Kong China Quantum Science Center of Guangdong-Hong Kong-Macao Great Bay Area 3 Binlang Road Shenzhen China Materials Innovation Institute for Life Sciences and Energy (MILES) HKU-SIRI Shenzhen People’s Republic of China

Landau levels play a fundamental role in condensed matter physics, as they offer critical insights into charged particles’ behavior in magnetic fields. These unique characteristics have significant implications for understanding various quantum phenomena and materials’ electronic properties, such as the renowned quantum Hall effect. Over the past two decades, substantial advancements have been achieved in Landau levels in systems with linear band crossing points, like Weyl points, which exhibit fascinating features like chiral zero modes. The Landau levels observed thus far are independent of the magnetic field’s orientation. In this Letter, we experimentally demonstrate unconventional oriented Landau levels in acoustic Berry dipole systems, wherein by reversing the orientation of the pseudomagnetic field, the system exhibits distinct Landau spectra. Remarkably, we observe a new type of helical zero mode, whose existence critically depends on the magnetic field’s orientation. This is in sharp contrast to the well-studied chiral zero modes in Weyl systems, whose propagation direction, but not existence, depends on the applied magnetic field’s orientation. Our Letter opens up avenues for understanding the interaction of gauge fields with band singularities that go beyond Chern class, including Berry multipoles and even-dimensional monopoles, and offers new insights for exploring topological devices.

关键词： Magnetic fields

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Hybrid quantum-classical convolutional neural networks

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Science China(physics,Mechanics & Astronomy) 2021年第9期64卷 1-8页

作者： Junhua Liu Kwan Hui Lim Kristin LWood Wei Huang Chu Guo He-Liang Huang Information Systems Technology and Design Singapore University of Technology and DesignSingapore 487372Singapore Forth AI Singapore 487372Singapore College of Engineering Design and ComputingUniversity of Colorado DenverColorado 80208USA Guangxi Key Laboratory of Optoelectronic Information Processing Guilin University of Electronic TechnologyGuilin 541004China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics and Synergetic Innovation Center for Quantum Effects and ApplicationsHunan Normal UniversityChangsha 410081China Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics University of Science and Technology of ChinaHefei 230026China Shanghai Branch CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information and Quantum PhysicsUniversity of Science and Technology of ChinaHefei 201315China Henan Key Laboratory of Quantum Information and Cryptography Zhengzhou 450000China

Deep learning has been shown to be able to recognize data patterns better than humans in specific circumstances or *** parallel,quantum computing has demonstrated to be able to output complex wave functions with a few number of gate operations,which could generate distributions that are hard for a classical computer to *** we propose a hybrid quantum-classical convolutional neural network(QCCNN),inspired by convolutional neural networks(CNNs)but adapted to quantum computing to enhance the feature mapping *** is friendly to currently noisy intermediate-scale quantum computers,in terms of both number of qubits as well as circuit’s depths,while retaining important features of classical CNN,such as nonlinearity and *** also present a framework to automatically compute the gradients of hybrid quantum-classical loss functions which could be directly applied to other hybrid quantum-classical *** demonstrate the potential of this architecture by applying it to a Tetris dataset,and show that QCCNN can accomplish classification tasks with learning accuracy surpassing that of classical CNN with the same structure.

关键词： quantum computing quantum machine learning hybrid quantum-classical algorithm convolutional neural network

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