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Experimental realization of deterministic joint remote preparation of an arbitrary two-qubit pure state via GHZ states

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Science China(Information Sciences) 2024年第3期67卷 317-318页

作者： Nachuan LI Lu XU Jin-Ming LIU State Key Laboratory of Precision Spectrosco.y School of Physics and Electronic ScienceEast China Normal University Hefei Origin quantum co.puting technology co. Ltd.

quantum teleportation(QT) [1] enables secure transfer of an unknown quantum state between remote locations without physically transmitting the initial state. Unlike QT,with the sender possessing co.plete knowledge of the initial state, remote state preparation(RSP) [2] exhibits a tradeoff between the amount of the entanglement resource used and the classical co.munication co.t.

关键词： quantum co.munication

co.ntermeasure against blinding attack for single-photon detectors in quantum key distribution

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Journal of Semico.ductors 2024年第4期45卷 76-81页

作者： Lianjun Jiang Dongdong Li Yuqiang Fang Meisheng Zhao Ming Liu Zhilin Xie Yukang Zhao Yanlin Tang Wei Jiang Houlin Fang Rui Ma Lei Cheng Weifeng Yang Songtao Han Shibiao Tang quantumCTek co. Ltd.Hefei 230088China Shandong Institute of quantum Science and technology co. Ltd.Jinan 250101China quantumCTek(Beijing)co. Ltd.Beijing 100193China School of Cyber Science and technology University of Science and Technology of ChinaHefei 230027China Anhui Armed Police Force Hefei 230026China School of Electrical Engineering and Automation Anhui UniversityHefei 230601China

quantum key distribution(QKD),rooted in quantum mechanics,offers information-theoretic ***,practi-cal systems open security threats due to imperfections,notably bright-light blinding attacks targeting single-photon ***,we propose a co.cise,robust defense strategy for protecting single-photon detectors in QKD systems against blinding *** strategy uses a dual approach:detecting the bias current of the avalanche photodiode(APD)to defend against co.-tinuous-wave blinding attacks,and monitoring the avalanche amplitude to protect against pulsed blinding *** integrat-ing these two branches,the proposed solution effectively identifies and mitigates a wide range of bright light injection attempts,significantly enhancing the resilience of QKD systems against various bright-light blinding *** method forti-fies the safeguards of quantum co.munications and offers a crucial co.tribution to the field of quantum information security.

关键词： quantum key distribution single photon detector blinding attack pulsed blinding attack co.ntermeasure quan-tum co.munication

Random Green's Function Method for Large-Scale Electronic Structure Calculation

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Chinese Physics Letters 2024年第5期41卷 23-29页

作者：汤明发刘畅张爱霞张青云翟佳羽袁声军柯友启 School of Physical Science and technology ShanghaiTech UniversityShanghai 201210China Xiaogan Sichuang Information technology co. LTDXiaogan 432000China Institute of Mathematical Sciences ShanghaiTech UniversityShanghai 201210China Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education and School of Physics and TechnologyWuhan UniversityWuhan 430072China Wuhan Institute of quantum technology Wuhan 430206China

We report a linear-scaling random Green's function(rGF) method for large-scale electronic structure calculation. In this method, the rGF is defined on a set of random states and is efficiently calculated by projecting onto Krylov subspace. With the rGF method, the Fermi–Dirac operator can be obtained directly, avoiding the polynomial expansion to Fermi–Dirac function. To demonstrate the applicability, we implement the rGF method with the density-functional tight-binding method. It is shown that the Krylov subspace can maintain at small size for materials with different gaps at zero temperature, including H_(2)O and Si clusters. We find with a simple deflation technique that the rGF self-co.sistent calculation of H_(2)O clusters at T = 0 K can reach an error of~ 1 me V per H_(2)O molecule in total energy, co.pared to deterministic calculations. The rGF method provides an effective stochastic method for large-scale electronic structure simulation.

关键词： calculation function method

Remarkable average thermoelectric performance of the highly oriented Bi(Te,Se)-based thin films and devices

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Journal of Materiomics 2024年第2期10卷 366-376页

作者： Zhiliang Li Xiaoqi Yang Zhi Gao Jingxuan Wang Yuli Xue Jianglong Wang Qian Cao Zhihai Ding Shufang Wang Hebei Key Lab of Optic-Electronic Information and Materials Key Laboratory of High-Precision Computation and Application of Quantum Field Theory of Hebei ProvinceCollege of Physics Science and TechnologyHebei UniversityBaoding071002China Huabei co.ling Device co. LtdXianghe065400China

Bi(Te,Se)-based co.pounds have attracted lots of attention for nearly two centuries as one of the most successful co.mercial thermoelectric(TE)materials due to their high performance at near room *** with 3D bulks,2D thin films are more co.patible with modern semico.ductor technology and have unique advantages in the co.struction of micro-and *** device applications,high average TE performance over the entire operating temperature range is ***,highly c-axis-oriented N-type Bi(Te,Se)epitaxial thin films have been successfully prepared using the pulsed laser deposition technology by adjusting the deposition *** film deposited at~260℃demonstrate a remarkable average power factor(PFave)of~24.4 mW·cm^(-1)·K^(-2)over the tem-perature range of 305e470 K,higher than most of the state-of-the-art Bi(Te,Se)-based ***,the estimated average zT value of the film is as high as~*** then co.structed thin-film TE devices by using the above oriented Bi(Te,Se)films,and the maximum output power density of the device can reach up to~30.1 W/m^(2)under the temperature difference of 40 ***,the outstanding average TE performance of the highly oriented Bi(Te,Se)thin films will have an excellent panorama of applications in semico.ductor co.ling and power generation.

关键词： Bismuth telluride Oriented thin film Thermoelectric device Average power factor Output power density

Versatile and co.trolled quantum teleportation network

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Chinese Physics B 2024年第3期33卷 415-423页

作者：周瑶瑶梅鹏娴刘艳红吴量李雁翔闫智辉贾晓军 Department of Physics Taiyuan Normal UniversityJinzhong 030619China co.lege of Information Engineering Shanxi Vocational University of Engineering Science and TechnologyJinzhong 030619China Shanxi North Machinery Manufacturing co. LtdTaiyuan 030000China State Key Laboratory of quantum Optics and quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China co.laborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

A quantum teleportation network involving multiple users is essential for future quantum *** far,co.trolled quantum teleportation has been demonstrated in a three-user ***,versatile and co.trolled quantum teleportation network involving more users is in demand,which satisfies different co.binations of users for practical *** we propose a highly versatile and co.trolled teleportation network that can switch among various co.binations of different *** use a single co.tinuous-variable six-partite Greenberger-Horne-Zeilinger(GHZ)state to realize such a task by choosing the different measurement and feedback *** co.trolled teleportation network,which includes one sub-network,two sub-networks and three sub-networks,can be realized for different application of user ***,the co.erent feedback co.trol(CFC)can manipulate and improve the teleportation *** approach is flexible and scalable,and would provide a versatile platform for demonstrations of co.plex quantum co.munication and quantum co.puting protoco.s.

关键词： quantum teleportation co.erent feedback co.trol versatile co.trolled transformation

Design method of extractant for liquid-liquid extraction based on elements and chemical bonds

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Chinese Journal of Chemical Engineering 2024年第4期68卷 193-202页

作者： Yuwen Wei Chunling Zhang Yue Zhang Lili Wang Li Xia Xiaoyan Sun Shuguang Xiang Institute of Process System Engineering College of Chemical EngineeringQingdao University of Science and TechnologyQingdao 266042China Yantai Guobang Chemical Machinery technology co. Ltd.Yantai 264002China

In the petrochemical industry process, the relative volatility between the co.ponents to be separated is close to one or the azeotrope that systems are difficult to separate. Liquid-liquid extraction is a co.mon and effective separation method, and selecting an extraction agent is the key to extraction technology research. In this paper, a design method of extractants based on elements and chemical bonds was proposed. A knowledge-based molecular design method was adopted to pre-select elements and chemical bond groups. The molecules were automatically synthesized acco.ding to specific co.bination rules to avoid the problem of “co.bination explosion” of molecules. The target properties of the extractant were set, and the extractant meeting the requirements was selected by predicting the co.relation physical properties of the generated molecules. Based on the separation performance of the extractant in liquid-liquid extraction and the relative importance of each index, the fuzzy co.prehensive evaluation membership function was established, the analytic hierarchy process determined the mass ratio of each index, and the co.sistency test results were passed. The results of case study based on quantum chemical analysis demonstrated that effective determination of extractants for the analysis of benzene-cyclohexane systems. The results unanimously prove that the method has important theoretical significance and application value.

关键词： Molecular design Element and chemical bonds Molecular simulation Thermodynamics Solvent extraction

Tunable quantum anomalous Hall effects in ferromagnetic van der Waals heterostructures

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National Science Review 2024年第3期11卷 100-107页

作者： Feng Xue Yusheng Hou Zhe Wang Zhiming Xu Ke He Ruqian Wu Yong Xu Wenhui Duan Beijing Academy of quantum Information Sciences State Key Laboratory of Low Dimensional quantum Physics Department of Physics Tsinghua University Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices Center for Neutron Science and Technology School of Physics Sun Yat-sen University State Key Laboratory of Surface Physics Key Laboratory of Computational Physical Sciences and Department of PhysicsFudan University Frontier Science Center for quantum Information Department of Physics and Astronomy University of California-Irvine Tencent quantum Laboratory Tencent Technology(Shenzhen)Co.Ltd RIKEN Center for Emergent Matter Science(CEMS) Institute for Advanced Study Tsinghua University

The quantum anomalous Hall effect（QAHE） has unique advantages in topotronic applications, but it is still challenging to realize the QAHE with tunable magnetic and topological properties for building functional devices. Through systematic first-principles calculations, we predict that the in-plane magnetization induced QAHE with Chern numbers C = ±1 and the out-of-plane magnetization induced QAHE with high Chern numbers C = ±3 can be realized in a single material candidate, which is co.posed of van der Waals（vdW）co.pled Bi and MnBi2Te4monolayers. The switching between different phases of QAHE can be co.trolled in multiple ways, such as applying strain or（weak） magnetic field or twisting the vdW materials. The prediction of an experimentally available material system hosting robust, highly tunable QAHE will stimulate great research interest in the field. Our work opens a new avenue for the realization of tunable QAHE and provides a practical material platform for the development of topological electronics.

关键词： quantum anomalous Hall effect topological quantum phase transition van der Waals heterostructures tunable Chern number high Chern number

Electronic structure and spin state regulation of vanadium nitride via a sulfur doping strategy toward flexible zinc-air batteries

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Journal of Energy Chemistry 2024年第2期89卷 239-249,I0007页

作者： Daijie Deng Honghui Zhang Jianchun Wu Xing Tang Min Ling Sihua Dong Li Xu Henan Li Huaming Li Institute for Energy Research Institute of Quantum and Sustainable TechnologySchool of Chemistry and Chemical EngineeringSchool of Materials Science and EngineeringJiangsu Province and Education Ministry Co-Sponsored Synergistic Innovation Center of Modern Agricultural EquipmentJiangsu UniversityZhenjiang 212013JiangsuChina Key Laboratory of Radio Frequency and Micro-Nano Electronics of Jiangsu Province Nanjing 210023JiangsuChina Zhenjiang Kangyuan Electrical Appliance co. Ltd.Zhenjiang 212013JiangsuChina co.lege of Chemical and Biological Engineering Zhejiang UniversityHangzhou 310027ZhejiangChina YTO Group co.poration Dongfanghong(Henan)Agricultural Service technology co. Ltd.Luoyang 471033HenanChina

Owing to the distinctive structural characteristics,vanadium nitride(VN)is highly regarded as a catalyst for oxygen reduction reaction(ORR)in zinc-air batteries(ZABs).However,VN exhibits limited intrinsic ORR activity due to the weak adsorption ability to O-co.taining ***,the S-doped VN anchored on N,S-doped multi-dimensional carbon(S-VN/co.NS-MC)was co.structed using the solvothermal and in-situ doping *** sulfur atoms into VN species alters the electron spin state of vanadium in the S-VN/co.NS-MC for regulating the adsorption energy of vanadium sites to oxygen *** introduced sulfur atoms polarize the V 3d_(z)^(2) electrons,shifting spin-down electrons closer to the Fermi level in the S-VN/co.***,the introduction of sulfur atoms into VN species enhances the adsorption energy of vanadium sites for oxygen ****OOH dissociation transitions from being unspontaneous on the VN surface to a spontaneous state on the S-doped VN ***,the ORR barrier on the S-VN/co.NS-MC surface is *** S-VN/co.NS-MC demonstrates a higher half-wave potential and limiting current density co.pared to the VN/co.*** S-VN/co.NS-MC-based liquid ZABs display a power density of 195.7 m W cm^(-2),a specific capacity of 815.7 m A h g^(-1),and a cycling stability exceeding 250 *** S-VN/co.NS-MC-based flexible ZABs are successfully employed to charge both a smart watch and a mobile *** approach holds promise for advancing the co.mercial utilization of VN-based catalysts in ZABs.

关键词： S-doped VN Electronic structures Spin state regulation Oxygen reduction reaction Zinc-air batteries

On-chip source-device-independent quantum random number generator

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Photonics Research 2024年第7期12卷 1379-1394页

作者： LANG LI MINGLU CAI TAO WANG ZIco.G TAN PENG HUANG KAN WU GUIHUA ZENG State Key Laboratory of Advanced Optical co.munication Systems and Networks Shanghai Jiao Tong UniversityShanghai 200240China Institute of quantum Sensing and Information Processing School of Sensing Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Research Center for quantum Sciences Hefei National LaboratoryShanghai 201315China Shanghai Xun Tai Quantech co. Ltd.Shanghai 200241China

quantum resources offer intrinsic randomness that is valuable for applications such as cryptography, scientific simulation, and co.puting. Silico.-based photonics chips present an excellent platform for the co.t-effective deployment of next-generation quantum systems on a large scale, even at room temperature. Nevertheless,the potential susceptibility of these chips to hacker co.trol poses a challenge in ensuring security for on-chip quantum random number generation, which is crucial for enabling extensive utilization of quantum resources.

关键词： temperature quantum random