简介：我们为为一个洞模式认识到Kerr类型非线性建议一个计划。在计划，洞模式散地与一个单个三水平的原子交往。Undercertain条件，洞地的进化，从自由的原子度的decoupled，对应于克尔效果。计划能被概括为二个洞模式实现cross-Kerr效果andtwo-qubit阶段门。

简介：TheelectricalnonlinearityofsiliconmodulatorsbasedonreversedPNjunctionswasfoundtoseverelylimitthelinearityofthemodulators.Thiseffect,however,wasinadvertentlyneglectedinpreviousstudies.Consideringtheelectricalnonlinearityinsimulation,a32.2dBdegradationintheCDR3(i.e.,thesuppressionratiobetweenthefundamentalsignalandintermodulationdistortion)ofthemodulatorwasobservedatamodulationspeedof12GHz,andthespuriousfreedynamicrangewassimultaneouslydegradedby17.4dB.ItwasalsofoundthatthelinearityofthesiliconmodulatorcouldbeimprovedbyreducingtheseriesresistanceofthePNjunction.Thefrequencydependenceofthelinearityduetotheelectricalnonlinearitywasalsoinvestigated.

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简介：Weexperimentallydemonstrateself-trappingoflight,asaresultofplasmonicresonantopticalnonlinearity,inbothaqueousandorganic(toluene)suspensionsofgoldnanorods.Thethresholdpowerforsolitonformationisgreatlyreducedintolueneasopposedtoaqueoussuspensions.Itiswellknownthattheopticalgradientforcesareoptimizedatoff-resonancewavelengthsatwhichsuspendedparticlestypicallyexhibitastrongpositive(ornegative)polarizability.However,surprisingly,aswetunethewavelengthoftheopticalbeamfromacontinuous-wave(CW)laser,wefindthatthethresholdpowerisreducedbymorethanthreefoldattheplasmonicresonancefrequency.Byanalyzingtheopticalforcesandtorqueactingonthenanorods,weshowtheoreticallythatitispossibletoalignthenanorodsinsideasolitonwaveguidechannelintoorthogonalorientationsbyusingmerelytwodifferentlaserwavelengths.Weperformaseriesofexperimentstoexaminethetransmissionofthesoliton-formingbeamitself,aswellasthepolarizationtransmissionspectrumofalow-powerprobebeamguidedalongthesolitonchannel.Itisfoundthattheexpectedsyntheticanisotropicpropertiesaretoosubtletobeclearlyobserved,inlargepartduetoBrownianmotionofthesolventmoleculesandalimitedorderingregionwheretheopticalfieldfromtheself-trappedbeamisstrongenoughtoovercomethermodynamicfluctuations.Theabilitytoachievetunablenonlinearityandnanorodorientationsincolloidalnanosuspensionswithlow-powerCWlaserbeamsmayleadtointerestingapplicationsinall-opticalswitchingandtransparentdisplaytechnologies.

简介：Weproposeathree-partyschemeforquantuminformationsplitting(QIS)ofanarbitrarysingle-photonpolarizationstatebasedonweakcross-Kerrnonlinearitycombinedwithlinearopticselementssuchaspolarizationbeamsplitters(PBSs)andhalfwaveplates(HWPs).Theschemeisgeneralizedtothearbitrary-partycase.Withthehelpofquantumnondemolition(QND)measurements,ourschemescanbeaccomplishedinanalmostdeterministicway.Thetwoschemesarefeasiblewiththecurrenttechnology.

简介：WeproposeaprotocoltoimplementthenonlocalBell-statemeasurement,whichisnearlydeterminatewiththehelpofweakcross-Kerrnonlinearitiesandquantumnon-destructivephotonnumberresolvingdetection.BasedonthenonlocalBell-statemeasurement,weimplementthequantuminformationtransferfromoneplacetoanother.Theprocessisdifferentfromconventionalteleportationbutcanberegardedasanovelformofteleportationwithoutentangledchannelandclassiccommunication.

简介：Weproposedanewschemeofcontrollingsecond-harmonicgenerationbyenhancedKerrelectro-opticnonlinearity.WedesignedastructurethatcanimplementthecascadedPockelseffectandsecond-harmonicgenerationsimultaneously.Theenergycouplingbetweenthefundamentallightsofdifferentpolarizationsledtoalargenonlinearphaseshiftand,thus,aneffectiveelectro-opticnonlinearrefractiveindex.Theeffectivenonlinearitycanbeeitherpositiveornegative,causingthesecond-harmonicspectratomovetowardthecouplingcenter,which,inturn,offeredusawaytomeasuretheeffectiveelectro-opticnonlinearrefractiveindex.ThecorrespondingenhancedKerrelectro-opticnonlinearityismorethanthreeordersofmagnitudehigherthantheintrinsicvalue.Theseresultsopenadoortomanipulatethenonlinearphasebyapplyinganexternalelectricfieldinsteadoflightintensityinnoncentrosymmetriccrystals.

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简介：Thispaperintroducesajointnonlinearityandchromaticdispersionpre-compensationmethodforcoherentopticalorthogonalfrequency-divisionmultiplexingsystems.Theresearchresultsshowthatthismethodcanreducethewalk-offeffectandcanthereforeequalizethenonlinearimpairmentseffectively.Comparedwiththeonlyotherexistingnonlinearitypre-compensationmethod,thejointnonlinearityandchromaticdispersionpre-compensationmethodisnotonlysuitableforlow-dispersionopticalorthogonalfrequency-divisionmultiplexingsystem,butalsoeffectiveforhigh-dispersionopticalorthogonalfrequency-divisionmultiplexingtransmissionsystemwithhigherinputpowerbutwithoutopticaldispersioncompensation.Thesuggestedsolutiondoesnotincreasecomputationcomplexitycomparedwithonlynonlinearitypre-compensationmethod.For40Gbit/scoherentopticalorthogonalfrequency-divisionmultiplexing20×80kmstandardsingle-modefibresystem,thesuggestedmethodcanimprovethenonlinearthreshold(forQ>10dB)about2.7,1.2and1.0dB,andthemaximumQfactorabout1.2,0.4and0.3dB,for2,8and16ps/(nm·km)dispersioncoefficients.

简介：Theemissionwavelengthofalaserisphysicallypredeterminedbythegainmediumused.Consequently,arbitrarywavelengthgenerationisafundamentalchallengeinthescienceoflight.Presentsolutionsincludeopticalparametricgeneration,requiringcomplexopticalsetupsandspectrallyslicedsupercontinuum,takingadvantageofasimplerfibertechnology:afixed-wavelengthpumplaserpulseisconvertedintoaspectrallyverybroadbandoutput,fromwhichtherequiredresultingwavelengthisthenopticallyfiltered.Unfortunately,thisprocessisassociatedwithaninherentlypoornoisefigure,whichoftenprecludesmanyrealisticapplicationsofsuchsupercontinuumsources.Here,weshowthatbyaddingonlyonepassiveopticalelement—ataperedphotoniccrystalfiber—toafixed-wavelengthfemtosecondlaser,onecaninaverysimplemannerresonantlyconvertthelaseremissionwavelengthintoanultra-wideandcontinuousrangeofdesiredwavelengths,withverylowinherentnoise,andwithoutmechanicalrealignmentofthelaser.Thisisachievedbyexploitingthedoubleinterplayofnonlinearityandchirpinthelasersourceandchirpandphasematchinginthetaperedfiber.Asafirstdemonstrationofthissimpleandinexpensivetechnology,wepresentafemtosecondfiberlasercontinuouslytunableacrosstheentirered–green–bluespectralrange.

简介：Theconservationlawsforthe(1+2)-dimensionalZakharov–Kuznetsovmodifiedequalwidth(ZK-MEW)equationwithpowerlawnonlinearityareconstructedbyusingNoether’sapproachthroughaninterestingmethodofincreasingtheorderofthisequation.Withtheaidofanobtainedconservationlaw,thegeneralizeddoublereductiontheoremisappliedtothisequation.ItcanbeshownthatthereducedequationisasecondordernonlinearODE.Finally,someexactsolutionsforaparticularcaseofthisequationareobtainedaftersolvingthereducedequation.