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Solving Graph Problems Using Gaussian Boson Sampling

Physical Review Letters 2023年第19期130卷 190601-190601页

作者： Yu-Hao Deng Si-Qiu Gong Yi-Chao Gu Zhi-Jiong Zhang Hua-Liang Liu Hao Su Hao-Yang Tang Jia-Min Xu Meng-Hao Jia Ming-Cheng Chen Han-Sen Zhong Hui Wang Jiarong Yan Yi Hu Jia Huang Wei-Jun Zhang Hao Li Xiao Jiang Lixing You Zhen Wang Li Li Nai-Le Liu Chao-Yang Lu Jian-Wei Pan Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences University of Science and Technology of China Hefei 230026 China CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information and Quantum Physics University of Science and Technology of China Shanghai 201315 China Hefei National Laboratory University of Science and Technology of China Hefei 230088 China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Micro system and Information Technology (SIMIT) Chinese Academy of Sciences 865 Changning Road Shanghai 200050 China New Cornerstone Science Laboratory Shenzhen 518054 China

Gaussian boson sampling (GBS) is not only a feasible protocol for demonstrating quantum computational advantage, but also mathematically associated with certain graph-related and quantum chemistry problems. In particular, it is proposed that the generated samples from the GBS could be harnessed to enhance the classical stochastic algorithms in searching some graph features. Here, we use Jiǔzhāng, a noisy intermediate-scale quantum computer, to solve graph problems. The samples are generated from a 144-mode fully connected photonic processor, with photon click up to 80 in the quantum computational advantage regime. We investigate the open question of whether the GBS enhancement over the classical stochastic algorithms persists—and how it scales—with an increasing system size on noisy quantum devices in the computationally interesting regime. We experimentally observe the presence of GBS enhancement with a large photon-click number and a robustness of the enhancement under certain noise. Our work is a step toward testing real-world problems using the existing noisy intermediate-scale quantum computers and hopes to stimulate the development of more efficient classical and quantum-inspired algorithms.

关键词： Boson sampling Optical quantum information processing Quantum computation

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Deep-red emitting Mg2Ti04:Mn^(4+)phosphor ceramics for plant lighting

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Journal of Advanced Ceramics 2021年第1期10卷 88-97页

作者： Zixin WANG Hui LIN Dawei ZHANG Yiming SHEN Yang LI Ruijin HONG Chunxian TAO Zhaoxia HAN Lei CHEN Shengming ZHOU Engineering Research Center of Optical Instrument and System Ministry of Education and Shanghai Key Lab of Modem Optical SystemUniversity of Shanghai for Science and TechnologyNo.516 Jungong RoadShanghai 200093China Department of Pathology Xinhua HospitalShanghai Jiaotong University School of MedicineShanghai 200093China Laboratory of Micro-Nano Optoelectronic Materials and Devices Key Laboratory of Materials for High-Power LaserShanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China

In this study,deep-red emitting Mg2T i04:Mn4 phosphor ceramics were synthesized by the high temperature solid-state reaction *** ceramics can be excited by the 465 nm blue light and had a narrow emission with a full width at half maximum(FWMH)value of 31 *** peak wavelength was located at 658 nm,which matched the demanded wavelength for *** crystal field strength(Dq)and the Racah parameters(B and C)were estimated by the Tanabe-Sugano *** thermal conductivity of the Mg2Ti(0.999)O4:0.001Mn^(4+)ceramic was 7.535 W/(m·K)at room temperature,which was one order of magnitude higher than that of the traditional packaging method using the silicone gel.A set of phosphor converted LEDs were fabricated by mounting the phosphor ceramics onto the 460 nm blue LED chips and the CIE coordinates can move from the blue region to the purple light region with the thickness of the ceramic *** results indicated that the Mg2Ti04:Mn^(4+)phosphor ceramic was suitable for plant lighting when combined with a blue LED chip.

关键词： solid state reaction optical properties thermal conductivity ceramic phosphor

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Structural disorder-induced topological phase transitions in quasicrystals

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Physical Review B 2024年第19期109卷 195301-195301页

作者： Tan Peng Yong-Chen Xiong Chun-Bo Hua Zheng-Rong Liu Xiaolu Zhu Wei Cao Fang Lv Yue Hou Bin Zhou Ziyu Wang Rui Xiong Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education School of Physics and Technology Wuhan University Wuhan 430072 China Hubei Key Laboratory of Energy Storage and Power Battery and School of Mathematics Physics and Optoelectronic Engineering Hubei University of Automotive Technology Shiyan 442002 China School of Electronic and Information Engineering Hubei University of Science and Technology Xianning 437100 China Department of Physics Hubei University Wuhan 430062 China The Institute of Technological Science Wuhan University Wuhan 430072 China Key Laboratory of Intelligent Sensing System and Security of Ministry of Education Hubei University Wuhan 430062 China

Recently, structural disorder-induced topological phase transitions in periodic systems have attracted much attention. However, in aperiodic systems such as quasicrystalline systems, the interplay between structural disorder and band topology is still unclear. In this work, we investigate the effects of structural disorder on a quantum spin Hall insulator phase and a higher-order topological phase in a two-dimensional Amman-Beenker tiling quasicrystalline lattice. We demonstrate that the structural disorder can induce a topological phase transition from a quasicrystalline normal insulator phase to an amorphous quantum spin Hall insulator phase, which is confirmed by bulk gap closing and reopening, robust edge states, a quantized spin Bott index, and conductance. Furthermore, the structural disorder-induced higher-order topological phase transition from a quasicrystalline normal insulator phase to an amorphous higher-order topological phase characterized by a quantized quadrupole moment and topological corner states is also found. More strikingly, the disorder-induced higher-order topological insulator with eight corner states represents a distinctive topological state that eludes realization in conventional crystalline systems. Our work extends the study of the interplay between disorder effects and topologies to quasicrystalline and amorphous systems.

关键词： Topological insulators Topological phase transition Amorphous materials Tight-binding model

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Ultrahigh Thermal Conductance of the Point Contact between Amorphous Nanowire

SSRN

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SSRN 2024年

作者： Wang, Renzong Xiong, Yucheng Yang, Juekuan Liu, Zhichun Li, Shouhang Chen, Ge Liu, Xiangjun Institute of Micro/Nano Electromechanical System College of Mechanical Engineering Donghua University Shanghai201620 China School of Mechanical Engineering Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments Southeast University Nanjing210096 China School of Energy and Power Engineering Huazhong University of Science and Technology Wuhan430074 China

Amorphous interfaces/contacts are ubiquitous in numerous micro/nanoelectronic devices and functional composite materials. Traditionally, the thermal resistance of interfaces/contacts was believed to be the primary impediment to heat transport. However, in this study, through measuring thermal resistance between crystalline-amorphous core-shell Ge nanowires, we unveil an ultrahigh thermal conductance across the point contact between the amorphous shell of Ge nanowires with a room-temperature value of 892 MW/m2-K. This value surpasses the typical values observed in point contacts between crystalline nanowires/nanoribbons by one to three orders of magnitude and even exceeds that of epitaxial interfaces between well-lattice-matched materials. Molecular and lattice dynamic simulations further reveal that the observed ultrahigh thermal conductance is attributed to the broadened vibrational bandwidths within the amorphous contact, which facilitates the redistribution of phonon energy into a state conductive to more effective interfacial energy transmission, leading to an enhanced overlap of phonon modes and, consequently, a heightened thermal conductance. © 2024, The Authors. All rights reserved.

关键词： Heat conduction

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TEEM: Two-Factor Energy Evaluation Metric Toward Green Big Data system

TEEM: Two-Factor Energy Evaluation Metric Toward Green Big D...

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IEEE Conference on Global Communications (GLOBECOM)

作者： Weidong Fang Chunsheng Zhu Mohsen Guizani Zhiqi Li Wuxiong Zhang Joel J.P.C. Rodrigues Science and Technology on Micro-system Laboratory Shanghai Institute of Micro-system and Information Technology Chinese Academy of Sciences Shanghai China University of Chinese Academy of Sciences Beijing China Shanghai Research and Development Center for Micro-Nano Electronics Shanghai China College of Big Data and Internet Shenzhen Technology University Shenzhen China Machine Learning Department Mohamed Bin Zayed University of Artificial Intelligence (MBZUAI) UAE COPELABS Lusófona University Lisbon Portugal

Toward green Big Data system (BDS), one of the key requirements is to save energy consumption so that the system lifetime can be prolonged. Hence, the energy evaluation metric for the measurement of energy efficiency in green BDS, is very critical. Unfortunately, most current energy evaluation metrics are based on a single factor, which might be difficult to meet the diverse application requirements. In this paper, we propose a novel two-factor energy evaluation metric (TEEM) for green BDS. Specifically, the transmission distance and the modulation level are taken into account simultaneously, generating a metric named the bit-per energy consumption (BEC). Extensive simulation results demonstrate that the system performance in energy consumption can be more effectively evaluated by BEC.

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Multi-Band Compatible Camouflage Enabled by Phase Transition Modulation of Flexible Gst Films

SSRN

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SSRN 2024年

作者： Wang, Jian Wu, Zuoxu Sun, Xiaoyu Tang, Zunqian Wang, Chong Yu, Fangyuan Zhao, Zirui Mao, Jun Zhang, Qian Cao, Feng School of Science Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Harbin Institute of Technology Shenzhen518055 China School of Materials Science and Engineering Institute of Materials Genome & Big Data Harbin Institute of Technology Shenzhen518055 China State Key Laboratory of Advanced Welding and Joining China Fuzhou University China

With the rapid development of detection technology, there is an urgent need for multi-band compatible camouflage technology, particularly in the visible-infrared band. However, the conflicting requirements between camouflage across different bands and surface thermal management pose significant challenges in achieving synchronized control for multiple bands in diverse application environments and targets. Herein, we propose a spectrally selective emitter leveraging phase-change modulation of Ge2Sb2Te5, capable of achieving effective camouflage in both the visible band and two atmospheric windows over a wide temperature range. The designed emitters exhibit colorful appearances, compatible with various background environments, thereby ensuring the visible camouflage. Meanwhile, the emitters demonstrate low emissivity values of 0.1 in the MWIR band and 0.08 in the LWIR band, effectively reducing the infrared emission through atmospheric *** radiative temperatures of the optimized emitters in the MWIR and LWIR bands are reduced by 105 °C and 140 °C relative to the target surface (200 °C), respectively, providing excellent radiative suppression compared to similar studies. Remarkably, the designed emitter still demonstrates robust flexibility, making it suitable for a variety of targets with complex curved surfaces. This work paves the way for designing the flexible visible-infrared compatible camouflage coatings with integrated thermal management functionality. © 2024, The Authors. All rights reserved.

关键词： Germanium alloys

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A Symmetric Multilayer GeSe/GeSeSbTe Ovonic Threshold Switching Selector with Improved Endurance and Stability

A Symmetric Multilayer GeSe/GeSeSbTe Ovonic Threshold Switch...

引用

2021 IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2021

作者： Zhang, Shiqing Song, Bing Jia, Shujing Cao, Rongrong Liu, Sen Xu, Hui Li, Qingjiang National University of Defense Technology College of Electronic Science and Engineering Changsha410073 China Chinese Academy of Sciences Key Laboratory of Functional Materials for Informatics Shanghai Institute of Micro-System and Information Technology Shanghai200050 China

ISBN: (纸本)9781665417471

Ovonic threshold switching (OTS) selector is becoming the most suitable candidate for selector devices in memristor crossbar array, owing to its high selectivity and fast response time. However, device endurance and variance are persistent tricky problems for application. In this article, a novel symmetric multilayer OTS selector based on simple GeSe and SbTe-doped GeSe was investigated. The results showed improving selector performed extraordinary endurance up to 1010 and the fluctuation of threshold voltage is 1.5 %. These developments pave the way towards tuning a new class of OTS materials engineering, ensuring improvement of electrical performances. © 2021 IEEE.

关键词： Selenium compounds

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High responsivity and flexible deep-UV phototransistor based on Ta-doped β-Ga_(2)O_(3)

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npj Flexible Electronics 2022年第1期6卷 457-465页

作者： Xiao-Xi Li Guang Zeng Yu-Chun Li Hao Zhang Zhi-Gang Ji Ying-Guo Yang Man Luo Wei-Da Hu David Wei Zhang Hong-Liang Lu State Key Laboratory of ASIC and System Shanghai Institute of Intelligent Electronics&SystemsSchool of MicroelectronicsFudan University200433 ShanghaiChina National Key Laboratory of Science and Technology on Micro/Nano Fabrication Shanghai Jiao Tong University200240 ShanghaiChina Shanghai Synchrotron Radiation Facility(SSRF) Zhangjiang LabShanghai Advanced Research Institute&Shanghai Institute of Applied PhysicsChinese Academy of Sciences201204 ShanghaiChina State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of Sciences200083 ShanghaiChina

Deep-ultraviolet(DUV)phototransistors have shown great potential applications in UV imaging,artificial intelligence,and wearable *** a large number of wide bandgap semiconductors,the quasi-two-dimensionalβ-Ga_(2)O_(3) is considered as an ideal candidate for DUV photodetector ***,we report a high responsivity(R)and fully flexible Ta-dopedβ-Ga_(2)O_(3) DUV phototransistor which exhibits outstanding optoelectrical properties with a high R of 1.32×10^(6) A/W,a large detectivity of 5.68×10^(14) Jones,a great photo-to-dark current ratio of 1.10×10^(10)%,a high external quantum efficiency of 6.60×10^(8)%,and an ultra-fast response time of~3.50 ***,the flexible Ta-dopedβ-Ga_(2)O_(3) device also displays high reliability and mechanical flexibility that can sustain well after over 1×10^(4) bending ***,high-contrast imaging of UV light was obtained on the flexible DUV detector arrays,which can be efficiently trained and recognized by an artificial neural *** findings offer a perspective to develop wearable optoelectronics and UV imaging based on high-performance flexibleβ-Ga_(2)O_(3) DUV phototransistors,providing an inspiration for the future work in artificial intelligence and bionic robot fields.

关键词： transistor responsivity artificial

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Design,modeling and experimental investigation of a magnetically modulated rotational energy harvester for low frequency and irregular vibration

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science China(Technological sciences) 2020年第10期63卷 2051-2062页

作者： ZHAO LinChuan ZOU HongXiang GAO QiuHua YAN Ge WU ZhiYuan LIU FengRui WEI KeXiang YANG Bin ZHANG WenMing State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong UniversityShanghai 200240China Hunan Provincial Key Laboratory of Vehicle Power and Transmission System Hunan Institute of EngineeringXiangtan 411104China National Key Laboratory of Science and Technology on Micro/Nano Fabrication Shanghai Jiao Tong UniversityShanghai 200240China

Vibration energy harvesting is a promising approach for sustainable energy generation from ambience to meet the development of self-powered ***,we propose a novel compact non-resonant magnetically modulated rotational energy harvester(MMR-EH)for low frequency and irregular *** the rational arrangement of multiple magnetic fields in space,a ring route with low potential energy is established.A movable magnet can be non-contact modulated by the magnetic force to move along the ring route under irregular vibration,which is instrumental in electromechanical energy conversion.A dynamic model of the MMR-EH is developed based on the energy method and verified *** effects of key parameters on the magnetically modulated route are *** simulation and experimental results demonstrate that the MMR-EH can effectively harvest the energy from ultra-low frequency(3 Hz)and irregular *** a reciprocating vibration frequency of 10 Hz and an amplitude of 20 mm,the harvester can produce an average power of 0.29 mW.

关键词： energy harvesting vibration low frequency magnetically modulated route

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Dispersion engineering and measurement in crystalline microresonators using a fiber ring etalon

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Photonics Research 2021年第11期9卷 2222-2229页

作者： XIAOBAO ZHANG GUOPING LIN TANG SUN QINGHAI SONG GUANGZONG XIAO HUI LUO Ministry of Industry and Information Technology Key Laboratory of Micro-Nano Optoelectronic Information System School of ScienceHarbin Institute of TechnologyShenzhen 518055China College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China

Dispersion engineering and measurement are significant for nonlinear photonic applications using whispering gallery mode ***,the Kerr microresonator frequency comb as an important example has attracted a great amount of interest in research fields due to the potential capability of full integration on a chip.A simple and cost-efficient way for dispersion measurements is thereby in high demand for designing such a microcomb ***,we report a dispersion measurement approach using a fiber ring etalon *** free spectral range of the etalon is first measured through sideband modulation,and the dispersion of the etalon is inferred by binary function fitting during the dispersion *** method is demonstrated on two MgF_(2) disk *** results show good agreement with numerical simulations using the finite element *** engineering on such resonators is also numerically investigated.

关键词： fiber resonator Dispersion

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