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arXiv 2025年

作者： Xu, Hong-Ze Wang, Zheng-An Feng, Yu-Long Chen, Yu Zhang, Xinpeng Wang, Jingbo Chai, Xu-Dan Zhuang, Wei-Feng Jin, Yu-Xin Jin, Yirong Yu, Haifeng Fan, Heng Hu, Meng-Jun Liu, Dong E. Beijing Academy of Quantum Information Sciences Beijing100193 China Institute of Computing Technology Chinese Academy of Sciences 100190 China School of Medical Technology Beijing Institute of Technology 100081 China Institute of Physics Chinese Academy of Sciences Beijing100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100049 China CAS Center for Excellence in Topological Quantum Computation UCAS Beijing100190 China Hefei National Laboratory Hefei230088 China State Key Laboratory of Low Dimensional Quantum Physics Department of Physics Tsinghua University Beijing100084 China Frontier Science Center for Quantum Information Beijing100184 China

We present QSteed, a quantum compilation system that can be deployed on real quantum computing devices and quantum computing clusters. It is designed to meet the challenges of effectively compiling quantum tasks and managing multiple quantum backends. The system integrates two core components: a quantum compiler and a quantum computing resource virtualization manager, both of which provide standardized interfaces. The resource manager models quantum chips into different abstract layers, including the real quantum processing unit (QPU), the standard QPU (StdQPU), the substructure QPU (SubQPU), and the virtual QPU (VQPU), and stores this information in a quantum computing resource virtualization database, thus realizing the unified management of quantum computing devices. The quantum compiler adopts a modular and extensible design, providing a flexible framework for customizing compilation optimization strategies. It provides hardware-aware compilation algorithms that account for quantum gate noise and qubit coupling structures. By selecting the most suitable computing resources from the VQPU library, the compiler maps quantum tasks to the optimal qubit regions of the target device. We validated the effectiveness of the QSteed on the superconducting devices of the Quafu quantum cloud computing cluster. The quantum computing resource virtualization management technology of QSteed and the flexible and extensible design of its compiler make it possible to achieve unified management and task compilation for backend devices of multiple physical systems such as neutral-atom and ion-trap. © 2025, CC BY.

关键词： Superconducting devices

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Threshold Property of Photoresist Film for Two-photon Optical Memory

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中国激光(英文版) 2001年第5期10卷 365-368页

作者： ZHANG Jiangying MING Hai LIANG Zhongcheng WANG Pei XIE Jianping XIE Aifang ZHANG Zebo Laboratory of Quantum Information and Quantum Computation Department of Physics University of Science and Technology of China Laboratory of Optical Physics Institute of PhysicsChinese Academy of Sciences

Two-photon threshold property of photoresist films have been studied by changing exposure energy. When photoresist film is irradiated by Ti∶Sapphire laser with wavelength 770 nm, pulse width 130 fs, repetition rate 82 MHz, the damage and recording thresholds of the material are 9.15×105 J/cm2 and below 5.57×105 J/cm2, respectively. The principle experiments of two-photon optical memory are demonstrated in photoresist film. The patterns of optical bit data storage are realized at different input power density. The corresponding 3-D tomographies of these recorded spots are scanned under near-field optical microscope.

关键词： optical memory power density data storage

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Two Theorems on Calculating the Relative Entropy of Entanglement

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Chinese physics Letters 2001年第2期18卷 160-162页

作者： WU Sheng-Jun WU Qiang ZHANG Yong-De Laboratory of Quantum Communication and Quantum Computation and Department of Modern Physics University of Science and Technology of ChinaHefei 230027 Department of Astronomy and Applied Physics University of Science and Technology of ChinaHefei 230026

We present two theorems on calculating the relative entropy of *** 1 is an extension of Vedral and Plenio's theorem(***.A 57(1998)1619)for pure states,which is useful for calculating the relative entropy of entanglement for all pure states as well as for a class of mixed *** 2 gives the relative entropy of entanglement for any bipartite state whose tripartite purification has two separable reduced bipartite states.

关键词： states bipartite entropy

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Automated Detection of Epileptic Spikes and Seizures Incorporating a Novel Spatial Clustering Prior

arXiv

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arXiv 2025年

作者： Dong, Hanyang Sheng, Shurong Wang, Xiongfei Gao, Jia-Hong Sun, Yi Yang, Wanli Xiao, Kuntao Teng, Pengfei Luan, Guoming Lv, Zhao School of Artificial Intelligence Anhui University Hefei230601 China Anhui Province Key Laboratory of Biomedical Imaging and Intelligent Processing Institute of Artificial Intelligence Hefei Comprehensive National Science Center Hefei230088 China Department of Neurosurgery Beijing Key Laboratory of Epilepsy Sanbo Brain Hospital Capital Medical University Beijing China McGovern Institute for Brain Research Peking University Beijing China Center for MRI Research Academy for Advanced Interdisciplinary Studies Peking University Beijing China Beijing City Key Lab for Medical Physics and Engineering Institute of Heavy Ion Physics School of Physics Peking University Beijing China Anhui Province Key Laboratory of Multimodal Cognitive Computation School of Computer Science and Technology Anhui University Hefei230601 China

A Magnetoencephalography (MEG) time-series recording consists of multi-channel signals collected by superconducting sensors, with each signal’s intensity reflecting magnetic field changes over time at the sensor location. Automating epileptic MEG spike detection significantly reduces manual assessment time and effort, yielding substantial clinical benefits. Existing research addresses MEG spike detection by encoding neural network inputs with signals from all channel within a time segment, followed by classification. However, these methods overlook simultaneous spiking occurred from nearby sensors. We introduce a simple yet effective paradigm that first clusters MEG channels based on their sensor’s spatial position. Next, a novel convolutional input module is designed to integrate the spatial clustering and temporal changes of the signals. This module is fed into a custom MEEG-ResNet3D developed by the authors, which learns to extract relevant features and classify the input as a spike clip or not. Our method achieves an F1 score of 94.73% on a large real-world MEG dataset Sanbo-CMR collected from two centers, outperforming state-of-the-art approaches by 1.85%. Moreover, it demonstrates efficacy and stability in the Electroencephalographic (EEG) seizure detection task, yielding an improved weighted F1 score of 1.4% compared to current state-of-the-art techniques evaluated on TUSZ, whch is the largest EEG seizure dataset. Copyright © 2025, The Authors. All rights reserved.

关键词： Magnetoencephalography

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Enhancement of sensitivity near exceptional points in dissipative qubit-resonator systems

arXiv

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arXiv 2025年

作者： Han, Pei-Rong Wu, Fan Huang, Xin-Jie Wu, Huai-Zhi Zou, Chang-Ling Yi, Wei Zhang, Mengzhen Li, Hekang Xu, Kai Zheng, Dongning Fan, Heng Wen, Jianming Yang, Zhen-Biao Zheng, Shi-Biao School of Physics and Mechanical and Electrical Engineering Longyan University Longyan364012 China Fujian Key Laboratory of Quantum Information and Quantum Optics College of Physics and Information Engineering Fuzhou University Fuzhou350108 China CAS Key Laboratory of Quantum Information University of Science and Technology of China Hefei230026 China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Hefei230026 China Pritzker School of Molecular Engineering University of Chicago ChicagoIL60637 United States Institute of Physics Chinese Academy of Sciences Beijing100190 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing100190 China Department of Electrical and Computer Engineering Binghamton University BinghamtonNY13902 United States Department of Physics Kennesaw State University MariettaGA30060 United States

Dissipation usually plays a negative role in quantum metrological technologies, which aim to improve measurement precision by leveraging quantum effects that are vulnerable to environment-induced decoherence. Recently, it has been demonstrated that dissipation can actually be used as a favorable resource for enhancing the susceptibility of signal detection. However, demonstrations of such enhancement for detecting physical quantities in open quantum systems are still lacking. Here we propose and demonstrate a protocol for realizing such non-Hermitian quantum sensors for probing the coupling between a qubit and a resonator subjecting to energy dissipations. The excitation-number conversion associated with the no-jump evolution trajectory enables removal of the noisy outcomes with quantum jumps, implementing the exceptional point (EP), where the Rabi splitting exhibits a divergent behavior in response to a tiny variation of the effective coupling. The sensitivity enhancement near the EP is confirmed by both theoretical calculation and experimental measurement. Copyright © 2025, The Authors. All rights reserved.

关键词： Qubits

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Giant Self Spin-Valve Effect in the Kagome Helimagnet

arXiv

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arXiv 2025年

作者： Xu, Xitong Liu, Yonglai Zhao, Kesen Lin, Che-Min He, Miao Zhao, Haitian Zeng, Qingqi Hou, Yubin Lu, Qingyou Shao, Ding-Fu Jia, Shuang Du, Haifeng Meng, Wenjie Chang, Tay-Rong Qu, Zhe Anhui Key Laboratory of Low-Energy Quantum Materials and Devices High Magnetic Field Laboratory HFIPS Chinese Academy of Sciences Anhui Hefei230031 China Science Island Branch of Graduate School University of Science and Technology of China Anhui Hefei230026 China Department of Physics National Cheng Kung University Tainan701 Taiwan Key Laboratory of Materials Physics Institute of Solid State Physics HFIPS Chinese Academy of Sciences Hefei230031 China International Center for Quantum Materials School of Physics Peking University Beijing100871 China Interdisciplinary Institute of Light-Element Quantum Materials Research Center for Light-Element Advanced Materials Peking University Beijing100871 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing100190 China Tainan701 Taiwan Physics Division National Center for Theoretical Sciences Taipei10617 Taiwan

Kagome magnets can combine non-trivial band topology and electron correlations, offering a versatile playground for various quantum phenomena. In this work we propose that kagome magnets with frustrated interlayer interactions can intrinsically support a self spin-valve effect, and experimentally confirm this in the kagome helimagnet TmMn6Sn6. Under a magnetic field perpendicular to the helical axis, using magnetic force microscopy we observed stripe domains that stack strictly along the helical axis, which we attribute to the stability loss of the kagome helimagnetic state. Such a domain pattern spontaneously mimics the artificial multilayered structure in traditional spin valves, which, combined with the high spin polarization, leads to a giant magnetoresistance (GMR) ratio over 160%. This discovery opens an avenue to realize inherent spin valves in a variety of quantum magnets, and can hold promise in future spintronics. © 2025, CC BY-NC-ND.

关键词： Spin polarization

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Probabilistic Teleportation of the Three-Particle Entangled State via Entanglement Swapping

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Chinese physics Letters 2001年第8期18卷 1004-1006页

作者： LU Hong Laboratory of Quantum Communication and Quantum Computation University of Science and Technology of ChinaHefei 230026 Department of Physics Foshan UniversityFoshan 528000

A scheme of teleportation of a three-particle entangled state via entanglement swapping is *** is shown that if a two-particle entangled state and a three-particle entangled state(both are not maximum entangled states... 详细信息

关键词： particle state probabilistic

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Determination of activation energy of ion-implanted deuterium release from W–Y2O3

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Chinese physics B 2020年第6期29卷 327-332页

作者： Xue-Feng Wang Ji-Liang Wu Qiang Li Rui-Zhu Yang Zhan-Lei Wang Chang-An Chen Chun-Rong Feng Yong-Chu Rao Xiao-Hong Chen Xiao-Qiu Ye School of Sciences and Research Center for Advanced Computation Xihua UniversityChengdu 610039China Science and Technology on Surface Physics and Chemistry Laboratory Mianyang 621907China

The retention and release of deuterium in W–2%Y2O3 composite materials and commercially pure tungsten after they have been implanted by deuterium plasma(flux ~ 3.71 × 1021 D/m2·s, energy ~ 25 eV, and fluence up to 1.3 × 1026D/m2)are studied. The results show that the total amount of deuterium released from W–2%Y2O3 is 5.23 × 1020 D/m2(2.5 K/min),about 2.5 times higher than that from the pure tungsten. Thermal desorption spectra(TDS) at different heating rates(2.5 K/min–20 K/min) reveal that both W and W–2%Y2O3 have two main deuterium trapped sites. For the low temperature trap, the deuterium desorption activation energy is 0.85 eV(grain boundary) in W, while for high temperature trap, the desorption activation energy is 1.57 eV(vacancy) in W and 1.73 eV(vacancy) in W–2%Y2O3.

关键词： metals and alloys plasma-based ion implantation thermal desorption diffusion in solid

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Stiff-sloppy analysis of brain networks to reveal individual differences in task performance

arXiv

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arXiv 2025年

作者： Chen, Sida Tang, Qianyuan Toyoizumi, Taro Sommer, Werner Yu, Lianchun Zhou, Changsong Department of Physics Hong Kong Baptist University Kowloon Tong Hong Kong Centre for Nonlinear Studies Hong Kong Baptist University Kowloon Tong Hong Kong Lab for Neural Computation and Adaptation RIKEN Center for Brain Science 2-1 Hirosawa Saitama Wako351-0106 Japan Institut für Psychologie Humboldt-Universitat zu Berlin Germany School of Physical Science and Technology Lanzhou Center for Theoretical Physics Lanzhou University Gansu Lanzhou730000 China Key Laboratory of Theoretical Physics of Gansu Province Key Laboratory of Quantum Theory and Applications MoE Lanzhou University Gansu Lanzhou730000 China Life Science Imaging Centre Hong Kong Baptist University Kowloon Tong Hong Kong Faculty of Education National University of Malaysia Kuala Lumpur Malaysia

Understanding how brain networks recruit resources during cognitive tasks is key to explaining individual differences in task performance. Brain network parameters—including activity levels of regions and their connectivity—reflect the integration and segregation of functional subnetworks underlying task processing. However, the complexity and high dimensionality of these parameters pose a significant barrier to identifying functionally relevant individual differences. Here, we introduce stiff-sloppy analysis as a framework for uncovering the stiff parameter combinations that critically influence task-state brain dynamics, exemplified by working memory. Using the pairwise maximum entropy model (PMEM) calibrated to fMRI data and Fisher Information Matrix (FIM) analysis, we reveal that the stiff dimensions of the model parameters capture the most relevant integration and segregation processes of the default mode network and the working memory network. Individual differences along these stiff neural dimensions consistently correlate with working memory performance. Notably, stiff parameters robustly predicted working memory performance, even when the less sensitive ("sloppy") parameters were excluded. This study establishes stiff-sloppy analysis as a powerful approach to identify cognition-related brain networks, bridging neural dynamics and behavior and offering new avenues for personalized neuroscience including therapeutic innovation. Copyright © 2025, The Authors. All rights reserved.

关键词： Fisher information matrix

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Realization of the Three-Qubit Toffoli Gate in Molecules

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Chinese physics Letters 2000年第12期17卷 859-861页

作者： DU Jiang-Feng SHI Ming-Jun ZHOU Xian-Yi FAN Yang-Mei WU Ji-Hui YE Bang-Jiao WENG Hui-Min HAN Rong-Dian Laboratory of Quantum Communication and Quantum Computation University of Science and Technology of ChinaHefei 230026 Department of Modern Physics University of Science and Technology of ChinaHefei 230026 Laboratory of Structure Biology University of Science and Technology of ChinaHefei 230026

We present the experimental realization of this gate with a solution of chlorostyrene molecules. Our method does not depend heavily on the two-qubit controlled operation, which used to serve as the basic quantum operation in quantum computing. At present, we use transition operator that can be applied to all qubits in one operation. It appears that no experimental realization has yet been reported up to now regarding the implementation of quantum Toffoli gate using transition pulse on three-qubit nuclear magnetic resonance quantum computers. In addition, our method is experimentally convenient to be extended to more qubits.

关键词： quantum realization transition

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