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Ultra-low power MoS2 optoelectronic synapse with wavelength sensitivity for color target recognition

Science China(Information Sciences) 2025年第4期68卷 187-196页

作者： Bo WEI Yabo CHEN Xiaotong HAN Yan KANG Bujia LIANG Cheng LI Xiaokuo YANG Liang FANG Yuanxi PENG Institute for Quantum Information & State Key Laboratory of High Performance Computing College of ComputerNational University of Defense Technology Fundamentals Department Air Force Engineering University College of Advanced Interdisciplinary Studies National University of Defense Technology Institute of Quantum Information Science and Technology College of ScienceNational University of Defense Technology College of Computer National University of Defense Technology

Optoelectronic synapses that integrate visual perception and pre-processing hold significant potential for neuromorphic vision systems（NVSs）. However, due to a lack of wavelength sensitivity, existing NVS mainly focuses on gray-scale image processing, making it challenging to recognize color images. Additionally, the high power consumption of optoelectronic synapses, compared to the 10 fJ energy consumption of biological synapses, limits their broader application. To address these challenges, an energy-efficient NVS capable of color target recognition in a noisy environment was developed,utilizing a MoS2optoelectronic synapse with wavelength sensitivity. Benefiting from the distinct photon capture capabilities of 450, 535, and 650 nm light, the optoelectronic synapse exhibits wavelength-dependent synaptic plasticity, including excitatory postsynaptic current（EPSC）, paired-pulse facilitation（PPF）, and long-term plasticity（LTP）. These properties can effectively mimic the visual memory and color discrimination functions of the human vision system. Results demonstrate that the NVS, based on MoS2optoelectronic synapses, can eliminate the color noise at the sensor level, increasing color image recognition accuracy from 50% to 90%. Importantly, the optoelectronic synapse operates at a low voltage spike of0.0005 V, consuming only 0.075 fJ per spike, surpassing the energy efficiency of both existing optoelectronic and biological synapses. This ultra-low power, color-sensitive device eliminates the need for color filters and offers great promise for future deployment in filter-free NVS.

关键词： optoelectronic synapse neuromorphic vision system color recognition 2D materials image pre-processing

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How to use the dispersion in the χ(3) tensor for broadband generation of polarization-entangled photons

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Physical Review Research 2025年第2期7卷 L022017-L022017页

作者： Valeria Vento Francesco Ciccarello Sakthi Priya Amirtharaj Christophe Galland Institute of Physics Swiss Federal Institute of Technology Lausanne (EPFL) CH-1015 Lausanne Switzerland Center of Quantum Science and Engineering Swiss Federal Institute of Technology Lausanne (EPFL) CH-1015 Lausanne Switzerland Present address: Centre for Quantum Information Communication and Computing Indian Institute of Technology Madras Chennai Tamil Nadu 600036 India.

Polarization-entangled photon pairs are a widely used resource in quantum optics and technologies and are often produced using a nonlinear process. Most sources based on spontaneous parametric down-conversion have relatively narrow optical bandwidths because the pump, signal, and idler frequencies must satisfy a phase-matching condition. Extending the bandwidth—for example, to achieve spectral multiplexing—requires changing some experimental parameters such as temperature, crystal angle, poling period, etc. Here we demonstrate broadband (tens of THz for each photon) generation of polarization-entangled photon pairs by spontaneous four-wave mixing in a diamond crystal, with a simple colinear geometry requiring no further optical engineering. Our approach leverages the quantum interference between electronic and vibrational contributions to the χ(3) tensor. Entanglement is characterized by a single realization of a Bell test over the entire bandwidth using fiber dispersion spectroscopy and fast single-photon detectors. The results agree with the biphoton wave function predicted from the knowledge of the χ(3) and Raman tensors and demonstrate the general applicability of our approach to other crystalline materials.

关键词： Four wave mixing

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Progress on the antiferromagnetic topological insulator MnBi2Te4

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National Science Review 2024年第2期11卷 33-49页

作者： Shuai Li Tianyu Liu Chang Liu Yayu Wang Hai-Zhou Lu X.C.Xie Department of Physics Harbin Institute of Technology Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology(SUSTech) Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area(Guangdong) Shenzhen Key Laboratory of Quantum Science and Engineering International Quantum Academy Beijing Academy of Quantum Information Sciences Beijing Key Laboratory of Optoelectronic Functional Materials&Micro-Nano Devices Department of Physics Renmin University of China State Key Laboratory of Low Dimensional Quantum Physics Department of PhysicsTsinghua University Frontier Science Center for Quantum Information Hefei National Laboratory International Center for Quantum Materials School of Physics Peking University Institute for Nanoelectronic Devices and Quantum Computing Fudan University

Topological materials, which feature robust surface and/or edge states, have now been a research focus in condensed maTher physics. They represent a new class of materials exhibiting nontrivial topological phases,and provide a platform for exploring exotic transport phenomena, such as the quantum anomalous Hall effect and the quantum spin Hall effect. Recently, magnetic topological materials have attracted considerable interests due to the possibility to study the interplay between topological and magnetic *** particular, the quantum anomalous Hall and axion insulator phases can be realized in topological insulators with magnetic order. MnBi2Te4, as the first intrinsic antiferromagnetic topological insulator discovered, allows the examination of existing theoretical predictions; it has been extensively studied, and many new discoveries have been made. Here we review the progress made on MnBi2Te4from both experimental and theoretical aspects. The bulk crystal and magnetic structures are surveyed first, followed by a review of theoretical calculations and experimental probes on the band structure and surface states, and a discussion of various exotic phases that can be realized in MnBi2Te4. The properties of MnBi2Te4thin films and the corresponding transport studies are then reviewed, with an emphasis on the edge state transport. Possible future research directions in this field are also discussed.

关键词： MnBi2Te4 magnetic topological insulator antiferromagnetic quantum anomalous Hall effect axion insulator

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quantum control for time-dependent noise by inverse geometric optimization

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Science China(Physics,Mechanics & Astronomy) 2024年第9期67卷 51-57页

作者： Xiaodong Yang Yingcheng Li Ran Liu Xinfang Nie Tao Xin Dawei Lu Jun Li Institute of Quantum Precision Measurement State Key Laboratory of Radio Frequency Heterogeneous IntegrationCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China State Key Laboratory of Surface Physics Department of PhysicsCenter for Field Theory and Particle Physicsand Institute for Nanoelectronic Devices and Quantum ComputingFudan UniversityShanghai 200433China Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and TechnologyShenzhen 518055China Guangdong Provincial Key Laboratory of Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area(Guangdong) Shenzhen 518045China

quantum systems are exceedingly difficult to engineer because they are sensitive to various types of *** particular,timedependent noises are frequently encountered in experiments but how to overcome them remains a challenging *** this work,we propose a flexible robust control technique to resist time-dependent noises based on inverse geometric optimization working in the filter-function *** basic idea is to parameterize the control filter function geometrically and minimize its overlap with the noise spectral *** then effectively reduces the noise susceptibility of the controlled system *** show that the proposed method can produce high-quality robust pulses for realizing desired quantum evolutions under realistic noise ***,we demonstrate this method in examples including dynamical decoupling and quantum sensing protocols to enhance their performances.

关键词： time-dependent noise robust control quantum gates and states dynamical decoupling quantum sensing

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Stochastic Error Cancellation in Analog quantum Simulation 19

Stochastic Error Cancellation in Analog Quantum Simulation

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19th Conference on the Theory of quantum Computation, Communication and Cryptography, TQC 2024

作者： Cai, Yiyi Tong, Yu Preskill, John Institute for Quantum Information and Matter California Institute of Technology PasadenaCA United States Department of Electrical Engineering California Institute of Technology PasadenaCA United States AWS Center for Quantum Computing PasadenaCA United States

ISBN: (纸本)9783959773287

Analog quantum simulation is a promising path towards solving classically intractable problems in many-body physics on near-term quantum devices. However, the presence of noise limits the size of the system and the length of time that can be simulated. In our work, we consider an error model in which the actual Hamiltonian of the simulator differs from the target Hamiltonian we want to simulate by small local perturbations, which are assumed to be random and unbiased. We analyze the error accumulated in observables in this setting and show that, due to stochastic error cancellation, with high probability the error scales as the square root of the number of qubits instead of linearly. We explore the concentration phenomenon of this error as well as its implications for local observables in the thermodynamic limit. Moreover, we show that stochastic error cancellation also manifests in the fidelity between the target state at the end of time-evolution and the actual state we obtain in the presence of noise. This indicates that, to reach a certain fidelity, more noise can be tolerated than implied by the worst-case bound if the noise comes from many statistically independent sources. © Yiyi Cai, Yu Tong, and John Preskill.

关键词： Stochastic systems

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Intrinsic spin-orbit torque mechanism for deterministic all-electric switching of noncollinear antiferromagnets

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Physical Review B 2024年第12期109卷 L121115-L121115页

作者： Yiyuan Chen Z. Z. Du Hai-Zhou Lu X. C. Xie Shenzhen Institute for Quantum Science and Engineering and Department of Physics 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 Shenzhen Key Laboratory of Quantum Science and Engineering Shenzhen 518055 China International Quantum Academy Shenzhen 518048 China International Center for Quantum Materials School of Physics Peking University Beijing100871 China Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai 200433 China Hefei National Laboratory Hefei 230088 China

Using a pure electric current to control kagome noncollinear antiferromagnets is promising in information storage and processing, but a full description is still lacking, in particular, on intrinsic (i.e., no external magnetic fields or external spin currents) spin-orbit torques. In this work, we self-consistently describe the relations among the electronic structure, magnetic structure, spin accumulations, and intrinsic spin-orbit torques in the magnetic dynamics of a noncollinear antiferromagnet driven by a pure electric current. Our calculation can yield a critical current density comparable with those in the experiments, when considering the boost from the out-of-plane magnetic dynamics induced by the current-driven spin accumulation on individual magnetic moments. We stress the parity symmetry breaking in deterministic switching among magnetic structures. This work will be helpful for future applications of noncollinear antiferromagnets.

关键词： Geometric & topological phases Spin-orbit coupling Spintronics Antiferromagnets Weyl semimetal

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A Comparative Study of LSTM Models on Sentiment Analysis 6

A Comparative Study of LSTM Models on Sentiment Analysis

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6th International Conference on Computational Intelligence and Networks, CINE 2024

作者： Choudhury, Ritabrata Roy Dey, Soumik Paul, Prithwineel Kalinga Institute of Industrial Technology School of Computer Engineering Odisha Bhubaneswar India Institute of Engineering & Management University of Engineering & Management Centre of Excellence for Quantum Computing Department of Computer Science and Engineering West Bengal Kolkata India

ISBN: (纸本)9798331516796

In this paper, we conduct a comparative analysis of LSTM (Long Short-Term Memory) architectures, including GPU LSTM and Convolutional LSTM, for sentiment analysis tasks on an e-commerce dataset. The evaluation is based on precision, recall, and F1-score metrics for classifying positive and negative sentiments in product reviews. Both GPU LSTM and Convolutional LSTM models demonstrate strong performance in classifying positive sentiments. Moreover, these models achieve high precision, recall, and F1-score. However, they struggle with negative sentiment classification, exhibiting zero precision, recall, and F1-score for this class. Overall, both models achieve an accuracy of 0.97, indicating their effectiveness in sentiment analysis tasks. Furthermore, our study underscores the importance of further research to enhance the ability of the LSTM model to classify negative sentiments in e-commerce datasets accurately. © 2024 IEEE.

关键词： Convolutional LSTM E-commerce F1-score GPU LSTM LSTM Precision Recall Sentiment Analysis

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Preparing quantum states by measurement-feedback control with Bayesian optimization

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Frontiers of physics 2023年第6期18卷 291-299页

作者： Yadong Wu Juan Yao Pengfei Zhang Department of Physics Fudan UniversityShanghai 200438China State Key Laboratory of Surface Physics Key Laboratory of Micro and Nano Photonic Structures(MOE)Fudan UniversityShanghai 200438China Institute for Nanoelectronic Devices and Quantum Computing Fudan UniversityShanghai 200433China Shanghai Qi Zhi Institute AI TowerXuhui DistrictShanghai 200232China 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 Walter Burke Institute for Theoretical Physics&Institute for Quantum Information and Matter California Institute of TechnologyPasadenaCA 91125USA

The preparation of quantum states is crucial for enabling quantum computations and *** this work,we present a general framework for preparing ground states of many-body systems by combining the measurement-feedback control process(MFCP)with machine learning ***,we employ Bayesian optimization(BO)to enhance the efficiency of determining the measurement and feedback operators within the *** an illustration,we study the ground state preparation of the one-dimensional Bose−Hubbard *** BO,we are able to identify optimal parameters that can effectively drive the system towards low-energy states with a high probability across various quantum *** results open up new directions for further exploration and development of advanced control strategies for quantum computations and simulations.

关键词： state preparation feedback control Bayesian optimization

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Effect of polarization mismatch on differential phase based measurement device independent quantum key distribution

Effect of polarization mismatch on differential phase based ...

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Optica quantum 2.0 Conference and Exhibition, quantum 2.0

作者： Sharma, Nilesh Radhakrishnan, Chandrashekar Prabhakar, Anil Department of Electrical Engineering Indian Institute of Technology Madras Chennai India Center for Quantum Information Communication and Computing Indian Institute of Technology Madras Chennai India

The effect of polarization mismatched coherent pulses on the key rates of differential phase based MDI QKD is investigated. It is found that this protocol can withstand a polarization mismatch of at most 11? © 20... 详细信息

ISBN: (纸本)9781957171272

关键词： Beam splitters Phase Phase measurement Polarization quantum key distribution quantum key distribution networks

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PERFORMANCE OF CONCRETE BY PARTIAL REPLACEMENT OF COPPER SLAG WITH FINE AGGREGATE

PERFORMANCE OF CONCRETE BY PARTIAL REPLACEMENT OF COPPER SLA...

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2024 International Conference on Sustainable computing and Integrated Communication in Changing Landscape of AI, ICSCAI 2024

作者： Saurabh Ui Ain, Qurat Goyal, Arsh Singh, Ashuvendra Kumar, Mukesh Department of Civil Engineering Dev Bhoomi Institute of Technology Dehradun248007 India Department of Civil Engineering SoEC Dev Bhoomi Uttarakhand University Dehradun248007 India Department of Basic Computing Quantum University India Lloyd Institute of Engineering & Technology Greater Noida India

ISBN: (纸本)9798350355338

Concrete industry is moving toward industrial waste since natural resources are depleted on a regular basis. Through a design combination that meets different quality requirements and M35 grade of concrete using copper slag, we use copper slag for partial substitution of sand ranging from 0% to 20% by weight. Different compression strength measurements, such as compression strength and flexural strength, were examined, as well as a comparison of traditional and new concrete. When compared to a specified replacement rate, the test findings were acceptable. The results were obtained via the use of tests on concrete. Copper slag is a by-product of the copper production process that may be utilized to partly replace fine aggregate particles. The findings of a research on the durability of copper slag concrete as a partial substitute for sand is analyzed. The findings of an experimental research are presented, as well as many durability tests for partial copper slag substitution. This demonstrated that between 5% to 20% of copper slag may be utilized to replace sand in M35 concrete grades. © 2024 IEEE.

关键词： Concrete industry

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