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Entropy product measure for multipartite pure states

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Science china(physics,Mechanics & Astronomy) 2006年第5期49卷 606-615页

作者： CAO Wancang1,2. liu dan2. PAN Feng3 & {2. guilu2.4 1. {2. of physics, Chifeng College, Chifeng 02.001, china 2. key laboratory for Quantum Information and Measurements, {2. of physics, Tsinghua University, beijing 100084. china 3. {2. of physics, Liaoning Normal University, Dalian 11602., china 4. key laboratory for atomic and molecular Nano-Sciences, Tsinghua University, beijing 100084. china Correspondence should be addressed to {2. guilu department of physics Chifeng College Chifeng China key laboratory for Quantum Information and Measurements Department of Physics Tsinghua University Beijing China department of physics Liaoning Normal University Dalian China key laboratory for {{2. and {2. Nano-Sciences Tsinghua University Beijing China

An entanglement measure for multipartite pure states is formulated using the product of the von Neumann entropy of the reduced density matrices of the constituents. Based on this new measure, all possible ways of the maximal entanglement of the triqubit pure states are studied in detail and all types of the maximal entanglement have been compared with the result of ‘the average entropy’. The new measure can be used to calculate the degree of entanglement, and an improvement is given in the area near the zero entropy.

关键词： multipartite pure state von Neumann entropy entanglement measure

An N/4 fixed-point duality quantum search algorithm

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中国科学：物理学、力学、天文学英文版 2010年第9期53卷 1765-1768页

作者： HAO Liang1,liu dan{2.& {{2. guilu1,3 1key {2. for atomic and molecular nanosciences and department of physics,Tsinghua University,beijing {12.{1{2. {2.chool of Sciences,Dalian Nationalities University,Dalian 116600,{1{2. 3Tsinghua National {2. for Information Science and Technology,beijing {12.{1{2. key laboratory for {{2. and {2. nanosciences and department of physics Tsinghua University Beijing China School of Sciences Dalian Nationalities University Dalian China Tsinghua National laboratory for Information Science and Technology Beijing China

Here a fixed-point duality quantum search algorithm is *** algorithm uses iteratively non-unitary operations and measurements to search an unsorted *** the marked item is found,the algorithm stops *** algorithm uses a constant non-unitary operator,and requires N/4 steps on average(N is the number of data from the database) to locate the marked *** implementation of this algorithm in a usual quantum computer is also demonstrated.

关键词： fixed-point search algorithm duality quantum computing the N4 duality search algorithm

Simulation of general three-body interactions in a nuclear magnetic resonance ensemble quantum computer

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Science china(physics,Mechanics & Astronomy) 2008年第8期51卷 1089-1096页

作者： liu Wenzhang zhang JingFu DENG ZhiWei {2. guilu key laboratory of {{2. and {2. nanosciences and department of physics Tsinghua UniversityBeijing 100084China Tsinghua National laboratory for Information Science and Technology Beijing 100084China Testing and Analytical Center Beijing Normal UniversityBeijing 100875China

Three-body interaction plays an important role in many-body physics, and quantum computer is efficient in simulating many-body interactions. We have experimentally demonstrated the general three-body interactions in a three-qubit nuclear magnetic resonance ensemble quantum computer. Using a nuclear magnetic resonance computer we implemented general forms of three-body interactions including σ x 1 σ z 2.σ x 3 and σ x 1 σ z 2.σ y 3 The results show good agreement between theory and experiment. We have also given a concise and practical formula for a general n-body interaction in terms of one-and two-body interactions.

关键词： nuclear magnetic resonance quantum computer general three-body interaction ensemble quantum computer

Better engineering layered vanadium oxides for aqueous zinc‐ion batteries: Going beyond widening the interlayer spacing

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SmartMat 2024年第1期5卷 83-109页

作者： Yue Guo Hanmei Jiang Binbin liu Xingyang Wang Yifu zhang Jianguo Sun John Wang department of Materials Science and Engineering National University of SingaporeSingaporeSingapore State key laboratory of Fine Chemicals School of Chemical EngineeringDalian University of TechnologyDalianChina Institute of Materials Research and Engineering(IMRE) Agency for ScienceTechnology and Research(A*STAR)SingaporeSingapore

Aqueous zinc‐ion batteries(ZIBs)are regarded as among the most promising candidates for large‐scale grid energy storage,owing to their high safety,low costs,and environmental *** the past decade,vanadium oxides,which are exemplified by V2.5,have been widely developed as a class of cathode materials for ZIBs,where the relatively high theoretical capacity and structural stability are among the main ***,there are considerable challenges in the construction of vanadium‐based ZIBs with high capacity,long lifespan,and excellent rate *** widenings of the interlayer spacing in the layered vanadium oxides by pre‐intercalations appear to have reached their limitations in improving the energy density and other {2. performance parameters of ZIBs,although various metal ions(Na+,Ca2.,and Al3+)and even organic cations/groups have been ***,we discuss the advances made more recently,and also the challenges faced by the high‐performance vanadium oxides(V2.5‐based)cathodes,where there are several strategies to improve their electrochemical performance ranging from the new structural designs down to sub‐nano‐scopic/{2./{2. levels,including cation pre‐intercalation,structural water optimization,and defect engineering,to macroscopic structural *** {2. principles for an optimal structural design of the V2.5‐based cathode materials for high energy density and fast‐charging aqueous ZIBs are examined,aiming at paving the way for developing energy storage designed for those large scales,high safety,and low‐cost systems.

关键词： aqueous zinc‐ion batteries cations pre‐intercalation defect engineering structural water vanadium oxides

Different response patterns of local field potentials of the olfactory bulb in awake and anesthetized rats

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Different response patterns of local field potentials of the...

PPA复合改性对沥青-集料黏附及其水稳定性影响研究

中国神经科学学会第九届全国学术会议暨第五次会员代表大会

作者： An-An LI~1,Min liu~2.Lei {2.~2.Qing liu~1,Ling GONG~1,Fu-Qiang XU~(1,3,*) 1 Wuhan MRC,State key laboratory of Magnetic Resonance and {2. and molecular physics,Wuhan Institute of physics and Mathematics,the Chinese Academy of Sciences,Wuhan 430071,china 2.department of Chemistry and Life Science,Hubei University of Education,Wuhan 4302.5,china 3 Wuhan National laboratory for Optoelectronics,Wuhan 430074,china

＜正＞The olfactory bulb（OB）,an important odor information processing center in olfactory system,not only has heavy intermutual neural projections with brain areas related to olfaction,including piriform cortex,amygdala, hippocampus and striatum,but also receives regulatory affections from other brain regions such as raphe nuclei and locus *** of these projections provide the possible modulation of the activity in the OB by brain *** awake and anesthetized states are two different brain conditions and are both used extensively in electrophysiological studies of ***,the activity patterns of OB local field potentials（LFP）in responding to odor stimulation at different brain states are *** clarify this question,the LFP oscillations at granule cell layer of the OB in awake and anesthetized animals were *** found that the LFP responses induced by odor in awake state were complex,with different frequency bands showed different patterns:13-30 Hz,increased significantly;30-60 Hz,almost no response;and 60-90 Hz,decreased *** addition,the increased response of 13-30 Hz was transient, whereas the decreased response of 60-90 Hz was ***,when the animals were anesthetized by chloral hydrate,all of the three frequency bands showed significantly increased and long-lasting ***, the activity patterns of OB LFP in responding to odor stimulation are significantly different when the animals are under awake and anesthetized states,reflecting different neural mechanisms involved in the odor information processing under the two brain states.

关键词： brain states local field potential olfactory bulb odor

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中国公路学报 2024年第6期37卷 317-330页

作者：周育名张凯郭云龙岳浩王迪彭竹仪刘朝晖魏建国长沙理工大学道路结构与材料交通行业重点实验室湖南长沙410114 长沙理工大学交通运输工程学院湖南长沙410114 江苏东交智控科技集团股份有限公司江苏南京210046 山东高速交通建设集团有限公司山东济南250014 渥太华大学土木工程学院渥太华K1N 6N5

为探究多聚磷酸(PPA)对沥青-集料之间黏附及其水稳定性的影响,提出了以基质沥青、PPA改性沥青、SBS/PPA和SBR/PPA复合改性沥青与石灰岩、玄武岩和花岗岩集料组合的沥青混合料设计方案。采用分子动力学模拟方法,构建沥青-集料界面模型,... 详细信息

为探究多聚磷酸(PPA)对沥青-集料之间黏附及其水稳定性的影响,提出了以基质沥青、PPA改性沥青、SBS/PPA和SBR/PPA复合改性沥青与石灰岩、玄武岩和花岗岩集料组合的沥青混合料设计方案。采用分子动力学模拟方法,构建沥青-集料界面模型,并通过原子力显微镜(AFM)、接触角试验、动态剪切流变试验(DSR)以及浸水马歇尔试验和冻融劈裂试验探究了PPA掺加后对沥青-集料黏附及其水稳定性的影响。结果表明:随着PPA改性剂的添加,沥青表面自由能显著增大,沥青与集料间黏附功提高,交互能力增强,沥青混合料的水稳定性更优;通过3种集料的试验结果对比,发现碱性集料对改性沥青-集料的黏附与水稳定性改善效果更好;PPA加入后,使SBS、SBR聚合物改性沥青与集料间的黏附功略有下降,但综合水稳定性得到明显改善;因此,推荐采用SBS/PPA复合改性沥青及石灰岩集料进行混合料组合设计,此组合可以得到最佳的黏附性及水稳定性。

关键词：路面工程多聚磷酸改性沥青试验分析黏附性能水稳定性沥青-集料界面

Quantum Computation with Nonlinear Optics

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Communications in Theoretical physics 2008年第1期49卷 107-110页

作者： liu Yang zhang Wen-Hong zhang Cun-Lin {2. Gui-Lu key laboratory of {{2. and {2. nanosciences and department of physics Tsinghua University Beijing 100084China department of physics Capital Normal University Beijing 100037 China Tsinghua National laboratory for Information Science and Technology Beijing 100084 China

We propose a scheme of quantum computation with nonlinear quantum optics. Polarization states of photons are used for qubits. Photons with different frequencies represent different qubits. Single qubit rotation operation is implemented through optical elements like the Faraday polarization rotator. Photons are separated into different optical paths, or merged into a single optical path using dichromatic mirrors. The controlled-NOT gate between two qubits is implemented by the proper combination of parametric up and down conversions. This scheme has the following features：（1） No auxiliary qubits are required in the controlled-NOT gate operation; （2. No measurement is required in the course of the computation; （3） It is resource efficient and conceptually simple.

关键词： quantum computation nonlinear optics parametric up(down)-conversion polarization modulator

Sex modification of the association of the radial augmentation index and incident hypertension in a Chinese community-based population

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Journal of Geriatric Cardiology 2021年第1期18卷 39-46页

作者： Qiao QIN Fang-Fang FAN Meng-Yuan liu Bo liu Jia JIA {{2. zhang Yu-Xi LI Yi-Meng JIANG Peng-Fei SUN dan-Mei HE Jian-Ping LI Ming CHEN Bo ZHENG Yan zhang department of Cardiology Institute of Cardiovascular DiseasePeking University First HospitalBeijingChina

BACKGROUND Arterial stiffness,as assessed by aortic ultrasound and pulse wave velocity,is associated with incident ***,there is still no consensus on whether the augmentation index(AI)affects new onset of *** study investigated the relationship of radial AI(r AI)and incident hypertension in a Chinese community-based population without hypertension at *** A total of 1,615 Chinese non-hypertensive participants from an atherosclerosis cohort in beijing,china were included in our *** r AI normalized to heart rate of 75 beats/min(r AIp75)was obtained using HEM-9000 ***-onset hypertension was defined as blood pressure≥140/90 mm Hg or self-reported hypertension or taking anti-hypertensive medications at the follow up *** regression models were used to evaluate the impact of r AIp75 on the risk of new-onset *** After a mean {2.35-year follow-up,{2.3(13.19%)participants developed incident *** significant relation between r AIp75 and incident hypertension was observed in the whole population after adjustment for possible confounders(adjusted odds ratio(OR)and 95%confidence interval(CI):1.09[0.95-1.{2.];P=0.{2.60).However,r AIp75 was significantly associated with incident hypertension in women,but not in men(adjusted OR and 95%CI:1.{2.[1.06-1.56],P=0.0113 for women;0.91[0.7{{{2.5],P=0.4{2.4 for men;P for interaction=0.0133).CONCLUSIONS Sex modified the effect of the r AI on incident hypertension in a Chinese,community-based,non-hypertensive *** of the r AI could be considered in women with a high risk of hypertension for the purpose of primary intervention.

关键词： Sex modification of the association of the radial augmentation index and incident hypertension in a Chinese community-based population

Highly efficient and anti-poisoning single-atom cobalt catalyst for selective hydrogenation of nitroarenes

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Nano Research 2022年第12期15卷 10006-10013页

作者： Yuemin Lin Renfeng Nie Yuting Li Xun Wu Jiaqi Yu Shaohua Xie Yajing Shen Shanjun Mao Yuzhuo Chen dan Lu Zongbi Bao Qiwei Yang Qilong Ren Yiwen Yang Fudong {{2. long Qi Wenyu Huang Zhiguo {2. key laboratory of Biomass Chemical Engineering of Ministry of Education Cllege of Chemical and Biological EngineeringZhejiang University38 Zheda RoadHangzhou 310027China U.S.DOE Ames laboratory lowa State UniversityAmeslowa 50011USA department of Chemistry Iowa State UniversityAmeslowa 50011USA College of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China department of Civil Environmentaland Construction EngineeringCatalysis Cluster for Renewable Energy and Chemical Transformations(REACT)Nano Science Technology Center(NSTC)University of Central FloridaOrlandoFL 32816USA Advanced Materials and Catalysis Group Institute of CatalysisDepartment of ChemistryZhejiang UniversityHangzhou 310028China Institute of Zhejiang University-Quzhou Quzhou 324000China

Developing non-precious metal catalysts to selectively reduce functionalized nitroarenes with high efficiency is urgently desirable for the production of value-added ***,we report a novel,efficient,anti-poisoning single-atom cobalt catalyst(Co-NAC)for the highly selective hydrogenation of the nitro to amino group for nitroarenes baring various functional groups,including vinyl,cyano,and *** a combination of structure characterization techniques,we have confirmed that the cobalt species are predominantly present in the form of four-coordinated Co single sites anchored on nitrogen-assembly carbon(NAC)as the ordered mesoporous ***-NAC catalysts enable the full conversion and>99%selectivity with molecular H2.as a green reductant under mild conditions(80℃,2.MPa H2..As for the selective hydrogenation of 3-nitrostyrene,Co-NAC catalyst affords high catalytic productivity(19.7 h-1),which is superior to the cobalt nanoparticles(NPs)catalysts and most of the recently reported Co-based *** is attributed to the highly accessible atomically-dispersed Co active sites,the high surface area with ordered-mesoporous morphology and the prominent high content of nitrogen ***,Co-NAC catalyst displays resistance towards sulfur-containing poisons(2. equivalents)and strong non-oxidizing acid(8 M),showing great potential for continuous application in the chemical industry.

关键词： cobalt single-atom selective hydrogenation nitroarenes 3-nitrostyrene poisoning resistance