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1、Vol454
2、28August2008
3、doi:10.1038/nature07241LETTERSExperimentaldemonstrationofaBDCZquantumrepeaternode1,21,21131,2Zhen-ShengYuan*,Yu-AoChen*,BoZhao,ShuaiChen,Jo¨rgSchmiedmayer&Jian-WeiPanQuantumcommunicationisamethodthatoffersefficientandSecond,theswappingofnu
4、mber-stateentanglementusingasingle-securewaysfortheexchangeofinformationinanetwork.photoninterferometerleadstothegrowthofavacuumcomponentin1–4Large-scalequantumcommunication(oftheorderof100km)thegeneratedstate,andtotherapidgrowthoferrorsduetomultiple15hasbeen
5、achieved;however,seriousproblemsoccurbeyondthisemissionsfromindividualensembles.distancescale,mainlyduetoinevitablephotonlossinthetrans-9,10Anovelsolutionistocombinetheatomicquantummemoryin5missionchannel.QuantumcommunicationeventuallyfailswhenDLCZandthestrat
6、egyofBDCZ.Inthisscheme,two-photoninter-theprobabilityofadarkcountinthephotondetectorsbecomesferenceisusedtogeneratelong-distanceentanglement,sothecomparabletotheprobabilitythataphotoniscorrectlydetected.stabilityrequirementforthepathdifferencesisdeterminedbyt
7、heToovercomethisproblem,Briegel,Du¨r,CiracandZoller(BDCZ)coherencelengthofthephotonsandisconsequentlysevenordersof617introducedtheconceptofquantumrepeaters,combiningentan-magnitudelooserthanintheDLCZprotocol.Moreover,the7glementswappingandquantummemorytoeffic
8、ientlyextendthevacuumcomponentcanbesuppressedandisnolongeradominant9,10achievabledistances.Althoughentanglementswappinghasbeentermafterafewentanglementconnections.Followingthisscheme,8experimentallydemonstrated,theimplementationofBDCZwedemonstrateheretheimple
9、mentationofaquantumrepeaterquantumrepeatershasprovedchallengingowingtothedifficultynode,involvingentanglementswappingwiththefunctionofstorageofintegratingaquantummemory.Herewerealizeentanglementandretrievaloflight.Ahighprecisionoflocaloperationshasbeen6swappi
10、ngwithstorageandretrievaloflight,abuildingblockoftheachievedthatsurpassesthetheoreticalthresholdrequiredforthe9,10BDCZquantumrepeater.Wefollowaschemethatincorporatesrealizationofrobustqua
