简介:Thispaperstudiesthetwo-vibronboundstatesintheβ-Fermi-Pasta-Ulammodelbymeansofthenumberconservingapproximationcombinedwiththenumberstatemethod.Theresultsindicatethaton-site,adjacent-siteandmixedtwo-vibronboundstatesmayexistinthemodel.Specially,wavenumberhasasignificanteffectonsuchboundstates,whichmaybeconsideredasthequantumeffectsofthelocalizedstatesinquantumsystems.
简介:Recently,Liuetal.[Commun.Theor.Phys.57(2012)583]proposedaquantumprivatecomparisonprotocolbasedonentanglementswappingofBellstates,whichaimstosecurelycomparetheequalityoftwoparticipants’informationwiththehelpofasemi-honestthirdparty(TP).However,thepresentstudypointsoutthereisafatalloopholeinLiuetal.’sprotocol,andTPcanmakeBell-basismeasurementtoknowalltheparticipants’secretinputswithoutbeingdetected.Tofixtheproblem,asimplesolution,whichusesone-timeeavesdroppercheckingwithdecoyphotonsinsteadoftwiceeavesdroppercheckingwithBellstates,isdemonstrated.Comparedwiththeoriginalprotocol,itnotonlyreducestheBellstatesconsumptionbutalsosimplifiestheprotocolsteps.
简介:AnalternativeschemeisproposedtotransferquantumstatesandprepareaquantumnetworkincavityQED.Itisbasedontheinteractionofatwo-modecavityfieldwithathree-levelV-typeatom.Inthescheme,theatom-cavityfieldinteractionisresonant,thusthetimerequiredtocompletethequantumstatetransferprocessisgreatlyshortened,whichisveryimportantinviewofdecoherence.Moreover,thepresentschemedoesnotrequireonemodeofthecavitiestobeinitiallypreparedinone-photonstate,thusitismoreexperimentallyfeasiblethanthepreviousones.
简介:ThemagneticpropertiesofCeRhln5arestudiedbyfirst-principlescalculation.Spin-orbitcouplingisconsideredaswellasdifferentcorrectionsincludinglocaldensityapproximationpluson-siteCoulombinteractionU(U=1,1.5,3eV)andorbitalpolarization.TheresultsshowtheexistenceofonlymoderatecorrelationinCeRhln5andCe-4felectronsareontheborderoflocalizationanditinerancy.Theeffectofpressurebychangingthevolumeoftheunitcellisalsostudied.
简介:Ingraphene,conductanceelectronsbehaveasmasslessrelativisticparticlesandobeyananalogueoftheDiracequationintwodimensionswithachiralnature.Forthisreason,theboundingofelectronsingrapheneintheformofgeometriesofquantumdotsisimpossible.Ingaplessgraphene,duetoitsuniqueelectronicbandstructure,thereisaminimalconductivityatDiracpoints,thatis,inthelimitofzerodoping.Thiscreatesaproblemforusingsuchahighlymotivatednewmaterialinelectronicdevices.Oneofthewaystoovercomethisproblemisthecreationofabandgapinthegraphenebandstructure,whichismadebyinversionsymmetrybreaking(symmetryofsublattices).WeinvestigatetheconfinedstatesofthemasslessDiracfermionsinanimpuredgraphenebytheshort-rangeperturbationsfor"localchemicalpotential"and"localgap".Thecalculatedenergyspectrumexhibitsquitedifferentfeatureswithandwithouttheperturbations.Acharacteristicequationforboundstates(BSs)hasbeenobtained.Itissurprisinglyfoundthattherelationbetweentheradialfunctionsofsublatticeswavefunctions,i.e.,f_m~+(r),g_m~+(r),andf_m~-(r),g_m~-(r),canbeestablishedbySO(2)group.
简介:我们与强壮的纺纱轨道的couplings在三维、二维的材料处于悦耳的拓扑的量状态考察我们的理论进展。在三维的系统,我们建议新悦耳的拓扑的绝缘体,拓扑的绝缘在说的基于铋的skutterudites能被外部种类导致。涉及拓扑的乐队倒置过程的orbitals是d-orbitals,和p轨道,不同于象双性人那样的典型拓扑的绝缘体<潜水艇class=“a-plus-plus”>2Se<潜水艇class=“a-plus-plus”>3和BiTeI,在仅仅p轨道涉及乐队倒置的地方,处理。由于大d电子的状态的存在,在我们的建议拓扑的绝缘体的电子相互作用在另外的常规拓扑的绝缘体是比那强壮得多的。在二维的系统,我们调查了3d-transition-metal-dopedsilicene。用一个分析模型和第一原则的Wannier插值,我们表明与象钒那样的金属能支撑的某些3d转变装饰的那silicene稳定的量异常霍尔效果。我们也预言量山谷霍尔效果和电子上悦耳的拓扑的状态能在精力乐队倒置发生的某些transition-metal-dopedsilicenes被认识到。这些调查结果提供拓扑的状态能任意地在被控制的现实主义的材料。
简介:Wefocusonthefullrelativisticquantummechanicalcalculationsfromborontofluorineatomswithelectronicconfigurationof1s22s22pn(n=1,2,3,4,and5),where1s22s2istheclosedshelland2pnistheopenshell.Theiractiveelectronsintheopenshelloccupyallthesixspinorsasfaraspossible.Therefore,wesuggestanewrulecalled'maximumprobability'forthefullsymmetrygrouprelativistictheory.Furthermore,thespectralfinestructureoftheatomicgroundstatesbasedonthefullrelativistictheoryandtheirintervalsofL-Ssplittingareallreasonable.ItisimpossibletocalculatetheL-Ssplittingthroughnon-relativisticquantummechanics.Therelativisticeffectofatomicmassisincreasedsignificantlybyabout12foldsfromboronatomtofluorineatom.
简介:Weexperimentallydemonstratethenonlinearinteractionbetweentwochirpedbroadbandsingle-photon-levelcoherentstates.EachchirpedcoherentstateisgeneratedinindependentfiberBragggratings.Theyaresimultaneouslycoupledintoahigh-efficiencynonlinearwaveguide,wheretheyareconvertedintoanarrowbandsinglephotonstatewithanewfrequencybytheprocessofsum-frequencygeneration(SFG).AhigherSFGefficiencyof1.06×10-7isrealized,andthisefficiencymayachieveheraldingentanglementatadistance.Thisalsomadeitpossibletorealizelong-distancequantumcommunication,suchasdevice-independentquantumkeydistribution,bydirectlyusingbroadbandsinglephotonswithoutfiltering.
简介:TheUSSateDepartmenthasalwaysprofessedtobea"JudgeofHumanRightsintheWorld."Yearuponyear,itissuescountry-specifichumanrightsreports,accusingmorethan190countriesandregions,includingChina,oftheirhumanfightsconditions.Yetittumsablindeyetoitsown.Itisjustbehindthe"StatueofLiberty’"thathidesseriousinfringementsuponhumanrights.
简介:Theexistenceanduniquenessofpositivesteadystatesfortheage-structuredMSEIRepidemicmodelwithage-dependenttransmissioncoefficientisconsidered.Thresholdresultsfortheexistenceofendemicstatesareestablished;undercertainconditions,uniquenessisalsoshown.
简介:Representingtheappealsofitsindustry,thehigh-techinterestgrouphasrecentlybecomeanemergingpoliticalforceintheUnitedStates.Withabundantfinancialresourcesandproficiencyinpoliticalcommunication,thegrouprapidlygrowstobeasignificantforceintheAmericanpoliticalsphere.IthasstartedtoaffecttheinternalandforeignaffairsoftheU.S.andplayedaproactiveroleinthelatestpresidentialelection.Sincethehigh-techinterestgrouphasalreadybecomeandwillcontinuetobeabigplayerinSino-U.S.relations,Chinashouldcarefullydealwithitsappealsandconflictofinterests,andtrytodevelopthisgroupintoastabilizerbetweenthetwocountries.
简介:在美国,高速公路桥的当前的负担和电阻因素设计(LRFD)说明是由于典型死了的负担和经常的车辆的负担的行动考虑桥部件的失败可能性的基于可靠性的明确的表达。各种各样的极端负担效果例如地震和容器碰撞,没在一样的基于可靠性的站台上被考虑。自从这些极端负担,是时间变量,把他们与相结合经常,nonextreme负担是重要挑战。设计限制州方程的数字能基于这些失败可能性从实际应用的看法点不现实地大、不必要。基于AASHTO州的桥工程师,的意见许多负担联合处于他们的州是不足道的。这份报纸描述一个标准的明确的表达包括仅仅必要负担联合建立设计限制州。这个标准被为时间不变的可能的所有和改变负担联合并且划分成他们部分术语的时间检验全部的失败可能性建立。然后,重要负担联合能是容易地坚定的份量上。