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A von-Neumann-like photonic processor and its application in studying quantum signature of chaos

Light(science & Applications) 2024年第4期13卷 672-681页

作者： Shang Yu Wei Liu Si-Jing Tao Zhi-Peng Li Yi-Tao Wang Zhi-Peng Zhong Raj BPatel Yu Meng Yuan-Ze Yang Zhao-An Wang Nai-Jie Guo Xiao-Dong Zeng Zhe Chen Liang Xu Ning Zhang Xiao Liu Mu Yang Wen-Hao Zhang Zong-Quan Zhou Jin-Shi Xu Jian-Shun Tang Yong-Jian Han Chuan-Feng Li Guang-Can Guo CAS Key Laboratory of Quantum Information 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. Research Center for Quantum Sensing Zhejiang LabHangzhou 310000China. Quantum Optics and Laser Science Blackett LaboratoryImperial College LondonPrince Consort RdLondon SW72AZUK. Clarendon Laboratory Department of PhysicsOxford UniversityParks Road OX13PUOxfordUK

Photonic quantum computation plays an important role and offers unique *** decades after the milestone work of Knill-Laflamme-Milburn,various architectures of photonic processors have been proposed,and quantum advantage over classical computers has also been *** is now the opportune time to apply this technology to real-world ***,at current technology level,this aim is restricted by either programmability in bulk optics or loss in integrated optics for the existing architectures of processors,for which the resource cost is also a *** we present a von-Neumann-like architecture based on temporal-mode encoding and looped structure on table,which is capable of multimode-universal programmability,resource-efficiency,phasestability and *** order to illustrate these merits,we execute two different programs with varying resource requirements on the same processor,to investigate quantum signature of chaos from two aspects:the signature behaviors exhibited in phase space(13 modes),and the Fermi golden rule which has not been experimentally studied in quantitative way before(26 modes).The maximal program contains an optical interferometer network with 1694 freely-adjustable *** current state-of-the-art,our architecture stands as the most promising candidate for real-world applications.

关键词： quantum signature chaos

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Enhancing Photovoltaic Performance of Nonfused-Ring Electron Acceptors via Asymmetric End-Group Engineering and Noncovalently Conformational Locks

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Chinese Journal of Chemistry 2024年第5期42卷 485-490页

作者： Bo Liu Congqi Li Xiaobin Gu Yinghui Han Zhixiang Wei Yunhao Cai Xin Zhang Hui Huang Yanping Huo School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhouGuangdong510006 China College of Materials Science and Opto-Electronic Technology & Center of Materials Science and Optoelectronics Engineering & CAS Center for Excellence in Topological Quantum Computation & CAS Key Laboratory of Vacuum Physics University of Chinese Academy of SciencesBeijing100049 China College Resources and Environment University of Chinese Academy of SciencesBeijing100049 China Center for Excellence in Nanoscience (CAS) & Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS) National Center for Nanoscience and TechnologyBeijing100190 China

By employing the asymmetric end-group engineering,an asymmetric nonfused-ring electron acceptor(NFREA)was designed and *** with the symmetric analogs(NoCA-17 and NoCA-18),NoCA-19 possesses broader light absorption range,more coplanarπ-conjugated backbone,and appropriate crystallinity according to the experimental and theoretical *** organic solar cells based on J52:NoCA-19 exhibited a power conversion efficiency as high as 12.26%,which is much higher than those of J52:NoCA-17(9.50%)and J52:NoCA-18(11.77%),mainly due to more efficient exciton dissociation,better and balanced charge mobility,suppressed recombination loss,shorter charge extraction time,longer charge carrier lifetimes,and more favorable blend film *** findings demonstrate the great potential of asymmetric end-group engineering in exploring low-cost and high-performance NFREAs.

关键词： Organic solar cells Nonfused-ring electron acceptors Asymmetric end-group engineering Noncovalently conformational locks Low-cost acceptors

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Sustainable high-yield h-BN nanosheet production by liquid exfoliation for thermal interface materials

RSC Applied Interfaces

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RSC Applied Interfaces 2025年第2期2卷 534-549页

作者： Ravichandran, Vanmathi Varrla, Eswaraiah Sustainable Nanomaterials and Technologies Lab Department of Physics and Nanotechnology SRM Institute of Science and Technology SRM Nagar Kattankulathur Tamil Nadu Chengalpattu 603203 India

Thermally conductive and electrically insulating hexagonal boron nitride (h-BN) is essential for thermal interface materials (TIMs) to effectively transfer heat from the source to sink in laptops and optoelectronic devices. Currently, thermal compounds rely on energy-intensive techniques and require nanofillers in very high loading percentages. Additionally, using mixtures of several fillers is an unreliable approach for heat management. In this work, we demonstrate the high-yield synthesis of atomically thin h-BN nanosheets in a natural surfactant/aqueous medium using liquid phase exfoliation (LPE). The exfoliated nanosheets are characterized by electron microscopy, absorbance spectroscopy, and XPS techniques. Extinction and gravimetry measurements confirm an overall yield of ∼89% after four cycles of exfoliation, successfully converting thick and bulk h-BN into h-BN nanosheets (h-BNNS) in water. Approximately 90% of the exfoliated nanosheets in ink form are recovered from the dispersion through low-speed centrifugation, indicating that the surfactant molecules are loosely bonded to the surface of the nanosheets. The quality of the exfoliated h-BNNS, including the lateral length (∼269 nm) and the number of layers (∼6), remains consistent during recycling. A 20 wt% h-BNNS in PVA thermal film reduces the surface temperature of a 10 W light-emitting diode (LED) bulb by ∼11 °C, while a 20 wt% h-BNNS in silicone oil (SO) thermal grease performs comparably to commercial thermal paste with 50 wt% particle loading for heat management. The thermal conductivity of the h-BNNS-based thermal film and thermal grease was measured using a modified transient plane source (MTPS) method and modelled using finite element analysis (FEA) to calculate thermal resistance. This study explores the utilization of a high-yield LPE process for h-BN nanosheets with natural stabilizers, enabling scalable exfoliation for heat management applications. © 2025 RSC.

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All-optical method for generating transient microstructured targets in laser ion acceleration

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Physical Review Research 2024年第4期6卷 L042031页

作者： Ying Gao Pengjie Wang Bin Liu Shirui Xu Shiyou Chen Yinren Shou Jianbo Liu Zhusong Mei Zhengxuan Cao Tianqi Xu Zhipeng Liu Zhuo Pan Defeng Kong Ziyang Peng Yulan Liang Tan Song Xun Chen Qingfan Wu Yujia Zhang Jiarui Zhao Wei Qi Zhigang Deng Yanying Zhao Fuyuan Wu Matt Zepf Rafael Ramis Paul R. Bolton Xueqing Yan Wenjun Ma Jörg Schreiber State Key Lab of Nuclear Physics and Technology School of Physics Fakultät für Physik Guangdong Institute of Laser Plasma Accelerator Technology Guangzhou 510080 China Fröbelstieg 3 D-07743 Jena Germany China Science and Technology on Plasma Physics Laboratory Laser Fusion Research Center E.T.S.I. Aeronáutica y del Espacio Collaborative Innovation Center of Extreme Optics

We demonstrate an all-optical method that online produces “microstructured” targets by manipulating a Laguerre-Gaussian (LG) prepulse. Besides the enhancement of the proton number, the cutoff energy is nearly doubled. Such transient “microstructured” targets are characterized using both offline and online approaches. Based on probe experiments and hydrodynamic simulations, we develop a simple model to describe the electron density distribution upon the arrival of the main pulse. Two-dimensional particle-in-cell simulations reveal that the annular plasma acts as an oscillating cavity for hot electrons and results in a cascaded acceleration effect. The combination of low-intensity LG prepulses and ultraintense Gaussian pulses opens another avenue for fine-tuning laser-plasma interactions spatiotemporally in interdisciplinary applications.

关键词： Laser driven ion acceleration

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Atomic Nb-doping of WS_(2) for high-performance synaptic transistors in neuromorphic computing

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Microsystems & Nanoengineering 2024年第5期10卷 221-230页

作者： Kejie Guan Yinxiao Li Lin Liu Fugin Sun Yingyi Wang Zhuo Zheng Weifan Zhou Cheng Zhang Zhengyang Cai Xiaowei Wang Simin Feng Ting Zhang i-Lab Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of Sciences(CAS)SuzhouJiangsu 215123China School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefeiAnhui 230026China School of Electronic and Optical Engineering Nanjing University of Science and TechnologyNanjingJiangsu 210094China Department of Health and Environmental Sciences Xi'an Jiaotong-Liverpool University111 Renai RoadSuzhouJiangsu 215123China Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Physical Science and TechnologySuzhou University of Science and TechnologySuzhouJiangsu 215009China Department of Electronic Engineering Jiangnan UniversityWuxiJiangsu 214122China Nano-x Vacuum Interconnected Workstation Suzhou Institute of Nano-Tech&Nano-Bionics(SINANO)Chinese Academy of Sciences(CAS)SuzhouJiangsu 215123China

Owing to the controllable growth and large-area synthesis for high-density integration,interest in employing atomically thin two-dimensional(2D)transition-metal dichalcogenides(TMDCs)for synaptic transistors is *** particular,substitutional doping of 2D materials allows flexible modulation of material physical properties,facilitating precise control in defect engineering for eventual synaptic *** this study,to increase the switch ratio of synaptic transistors,we selectively performed experiments on WS_(2) and introduced niobium(Nb)atoms to serve as the channel *** Nb atoms were substitutionally doped at the W sites,forming a uniform distribution across the entire *** synaptic transistor devices exhibited an improved switch ratio of 103,100 times larger than that of devices prepared with undoped WS_(2).The Nb atoms in WS_(2) play crucial roles in trapping and detrapping *** modulation of channel conductivity achieved through the gate effectively simulates synaptic potentiation,inhibition,and repetitive learning *** Nb-WS_(2) synaptic transistor achieves 92.30% recognition accuracy on the Modifed National Institute of Standards and technology(MNIST)handwritten digit dataset after 125 training *** study's contribution extends to a pragmatic and accessible atomic doping methodology,elucidating the strategies underlying doping techniques for channel materials in synaptic transistors.

关键词： transistors doping trapping

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Observation of low thermal expansion behavior and weak thermal anisotropy in M_(3)A_(2)C phases

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Journal of Materials science & technology 2023年第23期154卷 210-216页

作者： Hongxiang Chen Zhilong Zhang Jun Deng Zhijie Lin Chunfu Hong Shixuan Du Pinqiang Dai School of Materials Science and Engineering Fujian University of Technology Fuzhou 350118 China Institute of Physics & University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing 100190 China Fujian Provincial Key Laboratory of Advanced Materials Processing and Application Fuzhou 350118 China Center for Advanced Energy and Functional Materials Fujian University of Technology Fuzhou 350118 China Songshan Lake Materials Laboratory Dongguan 523808 China CAS Key Laboratory of Vacuum Physics Beijing 100049 China

M_(3)A_(2)X phases,named 321 phases,are an atypical series of MAX phases featuring in the MA-triangular-prism bilayers,with the A=As/P,exhibiting excellent elastic *** work systematically studies the thermal expansion properties of 321 *** found their average linear thermal expansion coefficients(TECs),α_(L)=5-6μK^(–1),are the lowest among the reported values of MAX *** lowest average TEC was found in Nb_(3)As_(2)C(αa=4.46(4)μK^(–1),αc=5.09(4)μK–1,αL=5.09(4)μK–1).The average TEC and anisotropy factor(αc/αa)of Nb_(3)As_(2)C and Nb_(3)P_(2)C were lower than the ones of the corresponding 211 *** best isotropy performance was found in Nb_(3)P_(2)C (αc/αa=1.11).Moreover,our first-principles calculations demonstrate that the weaker chemical bonding between Nb-As/P than Nb-C induces thermal expansion in M_(3)A_(2)X ***,a relatively weaker anharmonic effect in 321 phases than in the 211 phases was revealed by the as-calculated average Grüneisen parameters,which account for the lower TECs in 321 *** low TECs and enhanced thermal isotropy make 321 phases outstanding among MAX phases,which could be sound candidates for varying-temperature structural-functional components.

关键词： Max phase Layered ceramics Thermal expansion Anisotropy X-ray diffraction

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Skin mimicking-sweating evaporation polyimide cooling film for electronic devices

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science China(Technological sciences) 2023年第10期66卷 2797-2807页

作者： JIANG Miao XIAO Chao HE XuSheng DU HuiChao WANG YanYan DING Xin ZHANG Xian LI XiaoFei ZHENG Kang LIU XiangLan CHEN Lin TIAN XingYou Key Lab of Photovoltaic and Energy Conservation Materials Institute of Solid State PhysicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China Science Island Branch University of Science and Technology of ChinaHefei 230026China Lu’an Branch Anhui Institute of Innovation for Industrial TechnologyLu’an 237000China School of Materials Science and Engineering Anhui UniversityHefei 230039China

In hot environments,the human body shows an efficient capability to maintain a stable temperature by benefiting from sweating *** by this skin perspiration strategy,in this study,we demonstrated an innovative polyimide foam(PIF)-based mimetic skin with excellent cooling capability by integrating a silver coating and reusable hydrogel for the first *** of the hybrid thermal dissipating system,the successive silver coating quickly transferred heat to the inside of the polyacrylamide ***,the hydrogel absorbed a large amount of heat due to its large enthalpy and effectively dissipated heat to the environment through the evaporation of moisture,similar to the sweating of ***,the temperature of the skin-like film was reduced by 25.4℃compared with pure PIF under a high-power laser heating *** and remarkable cooling effects were also obtained in mobile phone and battery applications,far better than commercially available thermally conductive polyimide(PI).This outstanding performance paves a new way for the thermal management application of PI in wearable electronics,microprocessors,and flexible electronics.

关键词： skin-mimicking polyimide hydrogel thermal management sweat cooling

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Energy Levels and Transition Rates for Laser Cooling Os-and a General Approach to Produce Cold Atoms and Molecules

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Chinese physics Letters 2023年第9期40卷 32-37页

作者：陆禹竹张瑞宋昌仙陈重阳司然宁传刚 Department of Physics State Key Laboratory of Low-Dimensional Quantum PhysicsTsinghua UniversityBeijing 100084China Shanghai EBIT Lab Key Laboratory of Nuclear Physics and Ion-Beam Application(MOE)Institute of Modern PhysicsDepartment of Nuclear Science and TechnologyFudan UniversityShanghai 200433China Frontier Science Center for Quantum Information Tsinghua UniversityBeijing 100084China

High-resolution photoelectron energy spectra of osmium anions are obtained using the slow-electron velocitymap imaging *** energy levels of excited states^(4)F_(7/2),^(4)F_(5/2)and^(4)F_(3/2)of Os-are determined to be 148.730(13),155.69(15),and 176.76(13)THz[or 4961.09(41),5193.4(49),and 5896.1(42)cm-1],*** lifetime of the opposite-parity excited state^(6)D^(o)_(9/2)is determined to be 201(10)μs using a cold ion trap,about 15 times shorter than the previous result 3(1)*** high-level multi-configuration Dirac–Hartree–Fock calculations yield a theoretical lifetime 527μ*** work shows that the laser cooling rate of Os-is as fast as that of Th-.The advantages of Os-are its near-IR range cooling transition and simple electronic structure,which make Os-a promising candidate for laser cooling of negative *** propose a general approach to produce cold atoms and molecules based on the sympathetic cooling of negative ions in combination with a threshold photodetachment.

关键词： method. excited lifetime

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A First-Principles Study of Hfb2 Anisotropic Surface Stability and its Oxygen Adsorption Behavior

SSRN

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SSRN 2023年

作者： Cheng, Gong Cao, Shengzhu Xiong, Yuqing Zhou, Hui Zhang, Kaifeng Gao, Hengjiao Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Physics Lanzhou730000 China

In this work, the HfB2 anisotropic surface stability, and the adsorption and diffusion behavior of oxygen molecule on the most likely exposed HfB2 surface were investigated based on density functional theory. The study found that the HfB2(0001) surface terminated by Hf (labeled as: Hf-(0001)) is more stable and more likely interact with oxygen molecule. By rotating the oxygen molecule orientation and changing the adsorption site, all possible high and low-symmetry adsorption configurations are considered. The results show that the low symmetry structure is unstable, and eventually turn into the high symmetry ones. For the highly symmetric structures, oxygen molecule tends to be adsorbed in parallel, and the dissociated oxygen molecule tends to be located at the bridge and hollow site of the Hf-(0001) surface. Charge density difference and Partial density of states proved that three absorbed structures present similar electronic interaction characteristics, and oxygen adsorption mainly affects the Hf atom at the outmost layer of the Hf-(0001) plane. Oxygen atoms bind to the Hf-(0001) surface mainly in the form of ionic bonds and covalent bonds, originating from the orbital hybridization of O-p and Hf-d. The oxidation of HfB2 starts from the interaction between oxygen and Hf. © 2023, The Authors. All rights reserved.

关键词： Electronic structure

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Research on Correcting High-Mass Discrimination Effect of the Quadrupole Mass Spectrometer with Dodecane

SSRN

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SSRN 2023年

作者： Wang, Xinghui Cheng, Yongjun Dong, Meng Zhao, Lan Chen, Lian Feng, Tianyou Guo, Weng Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Physics Lanzhou730000 China

The quadrupole mass spectrometer (QMS) is one of the most established and widely used residual gas measurement instruments. However, a potential problem with QMS is the high-mass discrimination effect, which refers to the apparent ability to transmit ions with lower m/z values more efficiently than those with higher m/z values. It also leads to a reduction in the sensitivity of QMS when measuring ions with higher m/z values. Aiming at this problem, A method with dodecane to correct the high-mass discrimination effect of QMS was proposed and a correction device was designed. Finally, to verify the effectiveness of the method proposed in this paper, the high-mass discrimination effect of two quadrupole mass spectrometers was corrected through experiments. Results show that the method proposed in this paper can effectively reduce the impact of high-mass discrimination effect on QMS measurements without distinguishing between these specific sources of discrimination effect. © 2023, The Authors. All rights reserved.

关键词： Mass spectrometers

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