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1、weekendingPRL109,263601(2012)PHYSICALREVIEWLETTERS28DECEMBER2012CoherentControlofSingle-PhotonAbsorptionandReemissioninaTwo-LevelAtomicEnsembleShanchaoZhang,1ChangLiu,1ShuyuZhou,1Chih-SungChuu,2M.M.T.Loy,1andShengwangDu1,*1DepartmentofPhysics,TheHongKongUniversityofS
2、cienceandTechnology,ClearWaterBay,Kowloon,HongKong,People’sRepublicofChina2PhysicsDepartment,NationalTsingHuaUniversity,Hsinchu30013,Taiwan,RepublicofChina(Received7August2012;published27December2012)Wedemonstratecoherentcontrolofsingle-photonabsorptionandreemissioni
3、natwo-levelcoldatomicensemble.Thisisachievedbyinterferingtheincidentsingle-photonwavepacketwiththeemission(orscattering)wave.Foraphotonwithanexponentialgrowthwaveformwithatimeconstantequaltotheexcited-statelifetime,weobservethatthesingle-photonemissionprobabilityduri
4、ngtheabsorptioncanbesuppressedduetotheperfectdestructiveinterference.Aftertheincidentphotonwaveformisswitchedoff,theabsorbedphotonisthenreemittedtothesamespatialmodeasthatoftheincidentphotonwithanefficiencyof20%.Foraphotonwithanexponentialdecaywaveformwiththesametimec
5、onstant,boththeabsorptionandreemissionoccurwithinthewaveformduration.Ourexperimentalresultssuggestthattheabsorptionandemissionofasinglephotoninatwo-levelatomicensemblemaypossiblybemanipulatedbyshapingitswaveforminthetimedomain.DOI:10.1103/PhysRevLett.109.263601PACSnu
6、mbers:42.50.Nn,03.65.Ta,32.80.Qk,42.50.CtPhotonabsorptionandemissionaretwokeyprobestonetworksthatrequireefficientconversionbetweenflyingstudythelight-matterquantuminteraction,whichlayssingle-photonstatesandlocalatomicstates[12].downthefoundationsforatomic,molecular,and
7、opticalFigure1illustratestheschematicsofourmodeledsys-physics[1–3].Whenacoherentopticalpulsepropagatestem.Asinglephotonwithaninitial(singlemode)wavethroughamedium,theabsorptionandemissioncancoher-packetcinpassesthroughatwo-levelatomicensembleentlymodifyitsspectralcom
8、ponentsandleadtomanywithatomdensityNandlengthL.jgiandjeiaretheinterestingandimportantopticalphenomena,suchasat-groundandexcitedstat
