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1、OpticsCommunications284(2011)297–300ContentslistsavailableatScienceDirectOpticsCommunicationsjournalhomepage:www.elsevier.com/locate/optcomPreparationofarbitrarycorrelatedstatesofphotonsinmultiplespatiallyseparatedcavitiesZi-HongChen?,Zhen-BiaoYang,Chang-GengLiao,Cheng-LiLuoDepartmentofElectron
2、icScienceandAppliedPhysics,FuzhouUniversity,Fuzhou30002,ChinaarticleinfoabstractArticlehistory:Weproposedaschemeforgeneratingarbitrarymultiplespatiallyseparatedcorrelated?eldstates.ItisbasedReceived12May2010ontheresonantinteractionofacascade(M+1)levelatomsandMseparatedcavities.Finally,wediscuss
3、theReceivedinrevisedform19August2010experimentalfeasibilityofthescheme.Accepted15September2010?2010ElsevierB.V.Allrightsreserved.Keywords:Correlated?eldstatesCascadeM-levelatomResonantinteraction1.Introduction(M+1)levelatomsintoacavityinvolvingMmodes.However,therehasbeennoreportaboutmulti-modec
4、avitywith“strongcoupling”Entanglementisoneofthemostpeculiarfeaturesofquantumexperimentallyyet,thusitwouldbedif?culttoimplementthemechanics.Entangledquantumstatescomeinmany?avours,suchasschemeofref.[22].Ontheotherhand,thecorrelationbetweenmulti-Bell[1],Einstein–Podolsky–Rosen[2],GHZ[3],orWstates
5、[4].Itcanseparatedsystemscannotonlybeusedtotestlocalhiddenvariablebepreparedintrappedions[5–7],cavityQED[8,9],superconductingtheoriesagainstquantummechanics[1],butalsobeusefulin?eldscircuits[10],semiconductorquantumdots[11],linearopticalsystemsregardingquantuminformation,suchasquantumcryptograp
6、hy[23],[12,13]andimpurityspinsinsolids[14–16].quantumcomputation[24],andquantumteleportation[25].Howev-Inrecentyears,muchattentionhasbeenpaidtothegenerationofer,apparentlythereisnomethodofgeneratingarbitrarycorrelatedso-calledcorrelatedoranticorrelatedstatesoflightincavityQED.Forstatesinthreeor
7、morecavitiesthusfar.Inthispaper,weproposeaexample,Debetal.[17]hasproposedaschemeforproducingtwo-schemetopreparearbitrarycorrelatedstatesofphotonsinmultiplemodeanticorrelatedstates.Thedrawbackofthismethodisthatitspatiallyseparatedc
