简介:<正>ThispaperdevelopsasymptoticpropertiesofsingularlyperturbedMarkovchainswithinclusionofabsorbingstates.Itfocusesonbothunscaledandscaledoccupationmeasures.Undermildconditions,amean-squareestimateisobtained.Byaveragingthefastcomponents,weobtainanaggregatedprocess.Althoughtheaggregatedprocessitselfmaybenon-Markovian,itsweaklimitisaMarkovchainwithmuchsmallerstatespace.Moreover,asuitablyscaledsequenceconsistingofacomponentofscaledoccupationmeasuresandacomponentoftheaggregatedprocessisshowntoconvergetoapairofprocesseswithaswitchingdiffusioncomponent.
简介:我们在场对为在两倍井的ultracold波色子的物理政体的彻底的描述,与专辑,注意付钱到宏观的重叠(MS)。我们使用多达八个单个粒子模式的Lipkin-Meshkov-GlickHamiltonian的归纳学习这些MS,解决有数字准确diagonalization和高顺序的不安理论的联合的Hamiltonian。MS在左、正确的潜在的井之间;有同时位于井并且在仅仅二个模式的所有原子的极端情况是著名中午状态,但是我们的途径包含更一般的MS。更单个的粒子模式的使用把维数带进这个问题,允许我们将难限制放在通常在文学对待的原来的二模式的LMG模型的使用上,并且也介绍混合Josephson-Fock政体。更高的模式与不同尖性质介绍自由和MS状态的尖度。
简介:我们调查一个戒指系统联合到在一个维的拓扑的超导体nanowire的结束限制的二个Majorana界限状态的一个量点(QD)填写了的电子运输里面。由调节通过戒指穿的磁性的流动,当nanowire在它的拓扑的阶段时,我们考虑的模型系统能被交换进状态与或没有零精力的模式。我们发现在传导力光谱的Fano侧面为这二种不同状况由于在界限和连续统状态之间的干扰展出显著地不同的特征,它能因而被用来检测Majorana零精力的模式。作为磁性的流动的一个周期的函数,最有趣地,传导力看2频率二个Majorana界限状态什么时候是nonoverlapping(是在无穷地长的nanowire)但是当重叠成为非零时,显示4频率(作为在有限长度nanowire)。我们在Majorana费米子表示印射模型系统进一枚QD-Kitaev戒指并且由检查精力光谱肯定这些不同特征。
简介:Weproposeaschemeforteleportationoffour-levelatomicstatesinthermalcavities.TheschemedoesnotinvolvethegeneralizedBell-stateorgeneralizedGHZ-statemeasurement,whichisdifficultinpractice.Anotherfeatureoftheschemeisthatitdoesnotrequireindividualaddressingofatomsincavityandisinsensitivetobothcavitydecayandthermalfield,whichisofimportanceinpointofexperiment.
简介:<正>LetXbeaconnectedfiniteCWcomplexanddx:KO(C(X))→Zbethedimensionfunction.Weshowthat,ifAisaunitalseparablesimplenuclearC*-algebraofTR(A)=0withtheuniquetracialstateandsatisfyingtheUCTsuchthatKO(A)=QkerdxandK1(A)=K1(C(X)).thenAisisomorphictoaninductivelimitofMn!(C(X)).
简介:Undertheconditionofhigh-powerdrive,theexperimentalphenomenaoffreestatoroftravelingwaveultrasonicmotortakesonstrongnonlineareffects.Firstly,itscorrespondingtheoriesareestablishedtoanalyzeandcomparethestator'sperformancesattheresonanceandantiresonancestates.Atthesametime,someimportantparameters,suchasresonance/antiresonancefrequency,mechanicalquality,electro-mechaniccoupling,andtherelativevibrationeffect,areselectedelaboratelytoevaluatethevibrationalperformancesoffreestator.Then,someexperimentalschemesbasedonthelaservibrationmeasurementaredesignedrespectively.Underthedifferentdrivesconditions,theexperimentalcharacterizationsoffreestatorattheresonanceandantiresonancestatesareanalyzedsystematically.Finally,Theinvestigativeresultsshowthattheperformanceattheantiresonancestateismuchbetterthanthatattheresonancestate.Someconclusionsofthispapercanprovidenovelideaandguidanceforthechoosingoftheoperatingstatesanddrivingmodesoftravelingwaveultrasonicmotor.
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.