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1、PHYSICALREVIEWA84,043405(2011)CoherentpopulationtransferandquantumentanglementgenerationinvolvingaRydbergstatebystimulatedRamanadiabaticpassageDongYan,1,2Cui-LiCui,1MeiZhang,1andJin-HuiWu1,*1CollegeofPhysics,JilinUniversity,Changchun130012,People’sRepublicofChina2SchoolofScience,Chang
2、chunUniversity,Changchun130022,People’sRepublicofChina(Received15July2011;published5October2011)WestudyadilutesampleofcoldatomstoachieveefficientpopulationtransferfromagroundstatetoaRydbergstate.Thissampleisapproximatelydividedintomanyindependentmicrospherescontainingonlytwoatoms.Eachp
3、airofatomsinamicrospheremaybecomequantumcorrelatedviathedipole-dipoleinteractioncharacterizedbyavanderWaalspotential.Ournumericalresultsshowthat,bymodulatingdetuningsofapumppulseandaStokespulseappliedinthecounterintuitiveorder,wecandrivethedilutesampleeitherintotheblockaderegimeorinto
4、theantiblockaderegime.Intheblockaderegime,onlyoneatomisallowedtobecoherentlytransferredintotheRydbergstateinamicrosphere,whichthenresultsinamaximalentangledstate.Intheantiblockaderegime,however,bothatomsinamicrospherecanbeefficientlyexcitedintotheRydbergstate,whichisnotaccompaniedbyqua
5、ntumentanglement.Asecondmaximalentangledstatemayalsobegeneratedifweworkbetweentheblockaderegimeandtheantiblockaderegime.NotethattheexistenceofaquasidarkstateisessentialforexcitingbothatomsinamicrosphereintotheRydbergstatewhenthevanderWaalspotentialisnonzero.DOI:10.1103/PhysRevA.84.043
6、405PACSnumber(s):32.80.Rm,32.80.Ee,03.67.Bg,03.65.UdI.INTRODUCTIONintheformofagreatlyenhancedRydbergexcitationforaproperprincipalquantumnumber[18]orasuitabletwo-photonItwasrecentlyfoundthatanensembleofcoldatomscanbedetuning[19].Ontheotherhand,wenotethatthetechniqueofpartiallytransferr
7、edintoadesiredRydbergstatewithalargestimulatedRamanadiabaticpassage(STIRAP)hasbeenwellprincipalquantumnumberviatheresonantexcitationofoneorexploredtoefficientlytransfercoldatomsfromonegroundtwocoherentlasers[1–4].Thisopensanavenuetostudymanystatetoanothergroundstateinacontrolledfashion
8、[20–2
