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Boosting the generation rate of squeezed single-photon states by generalized photon subtraction

Physical Review A 2024年第3期110卷 033717页

作者： Hiroko Tomoda Akihiro Machinaga Kan Takase Jun Harada Takahiro Kashiwazaki Takeshi Umeki Shigehito Miki Fumihiro China Masahiro Yabuno Hirotaka Terai Daichi Okuno Shuntaro Takeda Department of Applied Physics School of Engineering Optical Quantum Computing Research Team NTT Device Technology Labs Advanced ICT Research Institute

In optical quantum information processing with continuous variables, optical non-Gaussian quantum states are essential for universal and fault-tolerant quantum computation. Experimentally, their most typical generation method is photon subtraction (PS), where single-photon detection by an on/off detector probabilistically heralds the generation of squeezed single-photon states. In PS, however, trying to avoid unwanted multiphoton detection inevitably limits the generation rate, hindering the application of squeezed single-photon states. Here, we theoretically show that generalized photon subtraction (GPS), a simple extension of PS, can improve the generation rate while maintaining the quality of the generated states. Furthermore, we experimentally demonstrate the generation rate improvement for 2-dB- and 4-dB-squeezed single-photon states compared to PS, by more than one order of magnitude, particularly for the case of 2 dB. Our results will accelerate the application of squeezed single-photon states to more advanced quantum information protocols.

关键词： quantum information processing quantum optics

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Experimental quantum simulation of a topologically protected Hadamard gate via braiding Fibonacci anyons

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The Innovation 2023年第5期4卷 41-46页

作者： Yu-ang Fan Yingcheng Li Yuting Hu Yishan Li Xinyue Long Hongfeng Liu Xiaodong Yang Xinfang Nie Jun Li Tao Xin Dawei Lu Yidun Wan Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southem University of Science and Technology Shenzhen 518055China State Key Laboratory of Surface Physics Department of PhysicsCenter for Field Theory and Particle Physicsand Institute for Nanoelectronic Devices and Quantum ComputingFudan UniversityShanghai 200433and Shanghai Qi Zhi InstituteShanghai 200030China School of Physics Hangzhou Normal UniversityHangzhou 311121China

Topological quantum computation(TQC)is one of the most striking architectures that can realize fault-tolerant quantum *** TQC,the logical space and the quantum gates are topologically protected,i.e.,robust against local *** topological protection,however,requires complicated lattice models and hard-to-manipulate dynamics;even the simplest system that can realize universal TQC-the Fibonacci anyon system—lacks a physical realization,let alone braiding the non-Abelian ***,we propose a disk model that can simulate the Fibonacci anyon system and construct the topologically protected logical spaces with the Fibonacci *** braiding the Fibonacci anyons,we can implement universal quantum gates on the logical *** disk model merely requires two physical qubits to realize three Fibonacci anyons at the *** 15 sequential braiding operations,we construct a topologically protected Hadamard gate,which is to date the least-resource requirement for *** showcase,we implement a topological Hadamard gate with two nuclear spin qubits,which reaches 97.18%fidelity by randomized *** further prove by experiment that the logical space and Hadamard gate are topologically protected:local disturbances due to thermal fluctuations result in a global phase *** a platform-independent proposal,our work is a proof of principle of TQC and paves the way toward fault-tolerant quantum computation.

关键词： Fibonacci Hadamard TQC

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PancakeFS: A Write Efficiently and Read Optimized Filesystem 4

PancakeFS: A Write Efficiently and Read Optimized Filesystem

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4th International Conference on Consumer Electronics and Computer engineering, ICCECE 2024

作者： Wang, Yongkang Liu, Yang Chen, Zhiguang School of Computer Science and Engineering Sun Yat-sen University Guangzhou China Institute for Quantum Information College of Computer National University of Defense Technology State Key Laboratory of High-Performance Computing Changsha China

ISBN: (纸本)9798350384062

With the development of emerging technologies such as cloud computing and large AI models (such as LLM), many applications have placed higher demands on the intensive read and write processing of massive data. Addressing the limitations of traditional file systems, we propose PancakeFS, an LSM-Tree-based file system. Leveraging the write-friendly characteristics of LSM-Tree, PancakeFS exhibits efficient write performance. We improve read performance through the design of an inode allocation algorithm based on subtree partitioning and optimization of the disk layout for hot data reconstruction. Our experimental results demonstrate that PancakeFS outperforms Ext4 and TableFS in terms of both read and write performance. © 2024 IEEE.

关键词： Data handling

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Noisy intermediate-scale quantum computers

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Frontiers of physics 2023年第2期18卷 1-62页

作者： Bin Cheng Xiu-Hao Deng Xiu Gu Yu He Guangchong Hu Peihao Huang Jun Li Ben-Chuan Lin Dawei Lu Yao Lu Chudan Qiu Hui Wang Tao Xin Shi Yu Man-Hong Yung Junkai Zeng Song Zhang Youpeng Zhong Xinhua Peng Franco Nori Dapeng Yu Shenzhen Institute for Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China International Quantum Academy Shenzhen 518048China Guangdong Provincial Key Laboratory of Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Physics Southern University of Science and TechnologyShenzhen 518055China Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences University of Science and Technology of ChinaHefei 230026China Quantum Computing Center and Cluster for Pioneering Research RIKENWakoshiSaitama 351-0198Japan Physics Department University of MichiganAnn ArborMI 48109-1040USA

quantum computers have made extraordinary progress over the past decade,and significant milestones have been achieved along the path of pursuing universal fault-tolerant quantum *** advantage,the tipping point heralding the quantum era,has been accomplished along with several waves of *** hardware has become more integrated and architectural compared to its toddler *** controlling precision of various physical systems is pushed beyond the fault-tolerant ***,quantum computation research has established a new norm by embracing industrialization and *** joint power of governments,private investors,and tech companies has significantly shaped a new vibrant environment that accelerates the development of this field,now at the beginning of the noisy intermediate-scale quantum ***,we first discuss the progress achieved in the field of quantum computation by reviewing the most important algorithms and advances in the most promising technical routes,and then summarizing the next-stage ***,we illustrate our confidence that solid foundations have been built for the fault-tolerant quantum computer and our optimism that the emergence of quantum killer applications essential for human society shall happen in the future.

关键词： quantum computer quantum algorithm quantum chip

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Formal Verification Based Synthesis for Behavior Trees 9th

Formal Verification Based Synthesis for Behavior Trees

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9th International Symposium on Dependable Software engineering: Theories, Tools and Applications, SETTA 2023

作者： Hong, Weijiang Chen, Zhenbang Li, Minglong Li, Yuhan Huang, Peishan Wang, Ji College of Computer National University of Defense Technology Changsha China Key Laboratory of Software Engineering for Complex Systems National University of Defense Technology Changsha China Institute for Quantum Information & State Key Laboratory of High Performance Computing National University of Defense Technology Changsha China

ISBN: (纸本)9789819986637

Behavior trees (BTs) have been extensively applied in the area of both computer games and robotics, as the control architectures. However, the construction of BTs is labor-expensive, time-consuming, and even impossible as the complexity of task increases. In this work, we propose a formal verification based synthesis method to automatically construct BTs whose behaviors satisfy the given Linear Temporal Logic (LTL) specifications. Our method first explores candidate BTs by a grammar-based Monte Carlo Tree Search (MCTS), then the explored BTs are transformed into Communicating Sequential Processes (CSP) models. After that, we invoke the verifier to check the models’ correctness w.r.t. specifications, and provide feedback based on the verification result for guiding the search process. The application of our method on several representative robotic missions indicates its promising. © 2024, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Behavior Trees CSP MCTS Synthesis

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quantum oscillation in Hopf-link semimetals

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Physical Review B 2025年第20期111卷 L201103-L201103页

作者： Lei Shi Xiaoxiong Liu C. M. Wang Tianyu Liu Hai-Zhou Lu X. C. Xie State Key Laboratory of Quantum Functional Materials Department of Physics and Guangdong Basic Research Center of Excellence for Quantum Science Southern University of Science and Technology (SUSTech) Shenzhen 518055 China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong) Shenzhen 518045 China Department of Physics Shanghai Normal University Shanghai 200234 China International Quantum Academy Shenzhen 518048 China Shenzhen Key Laboratory of Quantum Science and Engineering Shenzhen 518055 China International Center for Quantum Materials School of Physics Peking University Beijing 100871 China Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai 200433 China Hefei National Laboratory Hefei 230088 China

Since the discovery of the relation between the Chern number and quantum Hall effect, searching for observables of topological invariants has been an intriguing topic. Topological Hopf-link semimetals have attracted tremendous interest, in which the conduction and valence energy bands touch at linked nodal lines. However, it is challenging to identify this sophisticated topology. We propose to use the quantum oscillation in strong magnetic fields to probe the Hopf links. For a generic model of a Hopf-link semimetal that captures the linked-trivial phase transition, we figure out the phase shifts of oscillation for all Fermi pockets in all magnetic-field directions, by presenting self-consistent results from the Fermi-surface tomography, Landau fan diagram, and electrical resistivity. As the magnetic field is rotated, the phase shifts exhibit a unique pattern, which could help to identify Hopf links in real materials, such as those in Li2NaN.

关键词： Hall effect

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Online Fraud Detection using Machine Learning

Online Fraud Detection using Machine Learning

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2023 International Conference on Artificial Intelligence and Smart Communication, AISC 2023

作者： Dhiman, Diksha Bisht, Amita Kumari, Anita Anandaram, Dr Harishchander Saxena, Shaurydeep Joshi, Kapil University of Engineering and Technology School of Computing Roorkee India Uttaranchal University Uttaranchal Institute of Technology Dehradun India Kumaun University D.S.B Campus India Amrita School of Engineering Coimbatore India Quantum University Roorkee India

ISBN: (纸本)9798350322309

Fraudsters find it easy to commit credit card fraud because it is an easy target. There has been an increase in online payment modes in due to e-commerce and other online platforms, there is now a higher danger of online fraud. Due to an increase in fraudulent online transactions, researchers have begun to evaluate and detect fraud using machine learning. In order to examine past transaction information and extract consumer behavioral patterns, our main goal in this study, a novel fraud detection algorithm for streaming transaction data is built and created. A system that clusters cardholders according to the amount of their transactions. In order to extract the behavioral pattern of the groups, we should aggregate the sliding window method transactions done by cards from various groupings. It is then decided which classifier with the best rating score can be chosen as one of the best methods to predict frauds after training different classifiers over the groups separately. The paper shows how the model is related to convolutional neural networks and afterward adding classifiers algorithms, for example, Isolation Forest, Local Outlier, and SVM can be utilized to recognize misrepresentation. As a result, concept drift can be solved via a feedback mechanism. We used the Kaggle credit card fraud dataset for this article. © 2023 IEEE.

关键词： Support vector machines

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Precise quantum control of molecular rotation toward a desired orientation

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Physical Review Research 2025年第1期7卷 L012049-L012049页

作者： Qian-Qian Hong Daoyi Dong Niels E. Henriksen Franco Nori Jun He Chuan-Cun Shu Hunan Key Laboratory of Nanophotonics and Devices Hunan Key Laboratory of Super-Microstructure and Ultrafast Process School of Physics Central South University Changsha 410083 China Australian Artificial Intelligence Institute Faculty of Engineering and Information Technology University of Technology Sydney NSW 2007 Australia Department of Chemistry Technical University of Denmark Building 207 DK-2800 Kongens Lyngby Denmark Quantum Computing Center and Theoretical Quantum Physics Laboratory RIKEN Saitama 351-0198 Japan Physics Department University of Michigan Ann Arbor Michigan 48109 USA

The lack of a direct map between control fields and desired control objectives poses a significant challenge in applying quantum control theory to quantum technologies. Here, we propose an analytical framework to precisely control a limited set of quantum states and construct desired coherent superpositions using a well-designed laser pulse sequence with optimal amplitudes, phases, and delays. This theoretical framework that corresponds to a multilevel pulse-area theorem establishes a straightforward mapping between the control parameters of the pulse sequence and the amplitudes and phases of rotational states within a specific subspace. As an example, we utilize this approach to generate 15 distinct and desired rotational superpositions of ultracold polar molecules, leading to 15 desired field-free molecular orientations. By optimizing the superposition of the lowest 16 rotational states, we demonstrate that this approach can achieve a maximum orientation value of |〈cosθ〉|max above 0.99, which is very close to the global optimal value of 1 that could be achieved in an infinite-dimensional state space. This work marks a significant advancement in achieving precise control over multilevel subsystems within molecules. It holds potential applications in molecular alignment and orientation, as well as in various interdisciplinary fields related to the precise quantum control of ultracold polar molecules, opening up considerable opportunities in molecular-based quantum techniques.

关键词： Molecular orientation

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Exploring the Impact of IoT Data Diversity on Machine Learning Model 5

Exploring the Impact of IoT Data Diversity on Machine Learni...

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5th International Conference on Sustainable Communication Networks and Application, ICSCNA 2024

作者： Bisen, Dhananjay Venu, Nookala Dubey, Aditya Garg, Priyanka Salendra, Suresh Devi, T. Lakshmi Madhav Institute of Technology & Science Center for Internet of Things M.P Gwalior474 005 India ABV Indian Institute of Information Technology and Management Data Science and Quantum Computing M.P Gwalior474 015 India Balaji Institute of Technology & Science Dept. of Compter Science and Engineering Telangana Warangal506 331 India Siddhartha Institute of Engineering and Technology Dept.of CSE-Data Science Hyderabad501506 India

ISBN: (纸本)9798331530013

The past few years have witnessed a remarkable change by the rapid expansion of the Internet of Things (IoT). The increasing spread of networked devices in various areas of the Internet of Things has resulted in a huge amount of machine data. This data contains rich information that can be harnessed across domains such as healthcare, agriculture, smart cities, and manufacturing. To effectively analyze and capitalize this information, the integration of machine learning (ML) methods is essential. Thus, well-known machine learning techniques including Logistic Regression, Decision Tree, KNN, SVM, Random Forest, and Naive Bayes are used in paper. The performance of the algorithms is analyzed using three diverse IoT datasets and compared to one another using pre-defined measures such as accuracy, precision, recall, F1-score and execution time. Furthermore, test findings shown that the random forest algorithm consistently outperformed other algorithms for a variety of datasets with up to 98% accuracy. © 2024 IEEE.

关键词： Adversarial machine learning

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Multi-photon Fock state generation using a single-pixel ultrafast photon-number-resolving detector

Multi-photon Fock state generation using a single-pixel ultr...

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quantum 2.0, quantum 2024 in quantum 2.0 Conference and Exhibition

作者： Sonoyama, Tatsuki Takahashi, Kazuma Nomura, Takefumi Sano, Tomoki China, Fumihiro Yabuno, Masahiro Miki, Shigehito Terai, Hirotaka Takase, Kan Asavanant, Warit Endo, Mamoru Furusawa, Akira Department of Applied Physics School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-8656 Japan Advanced ICT Research Institute National Institute of Information and Communications Technology 588-2 Iwaoka Nishi-ku Hyogo Kobe651-2492 Japan Optical Quantum Computing Research Team RIKEN Center for Quantum Computing 2-1 Hirosawa Saitama Wako351-0198 Japan

Single-pixel superconducting nanostrip photon detectors (SNSPDs) have both low timing jitter of 50 ps and photon-number-resolving capability. We generate multi-photon Fock states with Wigner negativities using SNSPDs,... 详细信息

ISBN: (纸本)9781557525185

关键词： Timing jitter

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