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1、PHYSICALREVIEWA76,0223292007Fault-tolerantquantumrepeaterwithatomicensemblesandlinearoptics12231,2Zeng-BingChen,BoZhao,Yu-AoChen,JörgSchmiedmayer,andJian-WeiPan1HefeiNationalLaboratoryforPhysicalSciencesatMicroscaleandDepartmentofModernPhysics,UniversityofScienceandTechnologyo
2、fChina,Hefei,Anhui230026,China2PhysikalischesInstitut,UniversitätHeidelberg,Philosophenweg12,D-69120Heidelberg,Germany3AtominstitutderÖsterreichischenUniversitäten,TU-Wien,A-1020Vienna,AustriaReceived22October2006;published23August2007Wepresentadetailedanalysisofarobustquantum
3、repeaterarchitecturebuildingontheoriginalDuan-Lukin-Cirac-ZollerDLCZprotocolL.M.Duanetal.NatureLondon414,4132001.Thearchitectureisbasedontwo-photonHong-Ou-Mandel-typeinterferencewhichrelaxesthelong-distanceinterferometricsta-bilityrequirementsbyaboutsevenordersofmagnitud
4、e,fromsubwavelengthforthesinglephotoninterferencerequiredbyDLCZtothecoherencelengthofthephotons,therebyremovingtheweakestpointintheDLCZscheme.Ourproposalprovidesanexcitingpossibilityforrobustandrealisticlong-distancequantumcommunication.DOI:10.1103/PhysRevA.76.022329PACSnumbers
5、:03.67.Hk,03.67.Pp,42.50.pI.INTRODUCTIONpathlengthinstabilities,whichhastobekeptconstantwithinafractionofthephotonswavelength.Moreover,entangle-Quantumcommunicationultimatelyaimsatabsolutelyse-mentgenerationandentanglementswappingareprobabilis-curetransferofclassicalmessagesby
6、meansofquantumtic.Ifconnectingneighboringentangledpairsdoesnotsuc-cryptographyorfaithfulteleportationofunknownquantumceedafterperformingentanglementswapping,onehastostates1,2.Photonsareidealquantuminformationcarriersrepeatallpreviousprocedurestoreconstructtheentangledforquantu
7、mcommunication.Unfortunately,photonlossespairs.Thismeansthatthephasefluctuationsmustbestabi-andthedecreaseinthequalityofentanglementscaleexpo-lizeduntilthedesiredremoteentangledpairsaresuccessfullynentiallywiththelengthofthecommunicationchannel.Thegenerated.Aparticularanalysissho
8、wsthatseedetailsbe-quantumrepeaterprotocolcomb
