Deterministic and Storable Single-Photon Source Based on a Quantum Memory

《Deterministic and Storable Single-Photon Source Based on a Quantum Memory》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、PHYSICALREVIEWLETTERSweekendingPRL97,173004(2006)27OCTOBER2006DeterministicandStorableSingle-PhotonSourceBasedonaQuantumMemoryShuaiChen,1Yu-AoChen,1ThorstenStrassel,1Zhen-ShengYuan,1,2,*BoZhao,11,31,2,Jo¨rgSchmiedmayer,andJian-WeiPan1PhysikalischesInstitut,Ruprecht-Karls-Universita¨tHeidel

2、berg,Philosophenweg12,69120Heidelberg,Germany2DepartmentofModernPhysicsandHefeiNationalLaboratoryforPhysicalSciencesatMicroscale,UniversityofScienceandTechnologyofChina,Hefei,Anhui230026,China3AtominstitutderO¨sterreichischenUniversita¨ten,TU-Wien,A-1020Vienna,Austria(Received4July2006;pub

3、lished27October2006)Asingle-photonsourceisrealizedwithacoldatomicensemble(87Rbatoms).Asingleexcitation,writteninanatomicquantummemorybyRamanscatteringofalaserpulse,isretrieveddeterministicallyasasinglephotonatapredeterminedtime.Itisshownthattheproductionrateofsinglephotonscanbeenhancedcons

4、iderablybyafeedbackcircuitwhilethesingle-photonqualityisconserved.Suchasingle-photonsourceiswellsuitedforfuturelarge-scalerealizationofquantumcommunicationandlinearopticalquantumcomputation.DOI:10.1103/PhysRevLett.97.173004PACSnumbers:32.80.Pj,03.67.Hk,42.50.DvAlthoughweakcoherentbeamscanb

5、eusedasapseudoindicatedbythedetectionofacorrespondingRamanpho-single-photonsource,theadventofquantuminformationton.Thisinformationisusedasfeedbacktostoptheprocessing(QIP)hasplacedstringentrequirementsonsequence,andfurtherontostartthenextprocess,forsinglephotonseitherondemandorheralded[1].I

6、npar-example,toconvertthespinexcitationbackintoasingleticular,linearopticalquantumcomputation[2]dependsonphoton.Suchasequencecanbetakenashavingafeedfor-theavailabilityofsuchsingle-photonsources.Thesingle-wardabilityforthedeterministicallyconvertedsinglephotonnatureguaranteesunconditionalse

7、curityandhighphoton.efficiencyinquantumcryptography[3].Differentap-Recently,significantexperimentalprogresseshavebeenproacheshavebeenattemptedinthelastdecadetodevelopachievedindemonstrationofquantumstorageandsingle-anon-demandsingle-photonsource,suchasquantumdot