study materials for mit course [8.422] atomic and optical physics ii (2005) ww外语英文电子书

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1、Enhancedsingle-photonemissionfromaquantumdotinamicropostmicrocavityJelenaVuˇckovi´c,DavidFattal,CharlesSantori,GlennS.SolomonandYoshihisaYamamotoQuantumEntanglementProject,ICORP,JSTGinztonLaboratory,StanfordUniversity,StanfordCA94305July1,2006Abstractphotonsareu

2、nlikelytobeindistinguishable,withco-herencelengthsshorterthantheradiativelimit(FourierWedemonstrateasingle-photonsourcebasedonatransformlimit).Finally,thesingle-photongenerationquantumdotinamicropostmicrocavitythatexhibitsarateislow,asdeterminedbythelongexcitoni

3、clifetime.largePurcellfactortogetherwithasmallmulti-photonMicrocavitiescanhelpincorrectingallofthesedeficien-probability.Foraquantumdotonresonancewiththecies[11,8,7].Theradiativelifetimeofanemitteroncavity,thespontaneousemissionrateisincreasedbyaresonancewiththec

4、avitycanbedecreasedsignificantlyfactoroffive,whiletheprobabilitytoemittwoormorebelowthedephasingtime,bringingtheemittedphotonphotonsinthesamepulseisreducedto2%comparedpulsesclosertotheFouriertransformlimit.Moreover,toaPoisson-distributedsourceofthesameintensity.th

5、espontaneousemissionratecanbeenhanced,andInadditiontothesmallmulti-photonprobability,suchalargefractionofspontaneouslyemittedphotonscanastrongPurcelleffectisimportantinasingle-photonbecoupledintoasinglecavitymode,therebyincreas-sourceforimprovingthephotonoutcoupl

6、ingefficiencyingtheoutcouplingefficiency.ByemployingaQDinandthesingle-photongenerationrate,andforbringingamicropostmicrocavity,ourgrouphasrecentlydemon-theemittedphotonpulsesclosertotheFouriertrans-stratedefficienciescloseto40%[12].Wehavealsoprovedformlimit.thatconsec

7、utivephotonsemittedfromsuchasourcearelargelyindistinguishable,withameanwave-packetover-lapaslargeas0.81[13].Inthisarticle,wedemonstrateanimprovedsingle-photonsourcebasedonaquantumGenerationofsinglephotonsatawelldefinedtimingdotinamicropostmicrocavitythatexhibitsa

8、largePur-orclockiscrucialforpracticalimplementationofquan-tumkeydistribution(QKD)[1],aswellasforquan-cellfactor(Fp=5)togetherwithasmallmulti-photonprobability(g2(0)=2