Efficient and long-lived quantum memory with

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1、LETTERSPUBLISHEDONLINE:20MAY2012

2、DOI:10.1038/NPHYS2324Efficientandlong-livedquantummemorywithcoldatomsinsidearingcavityXiao-HuiBao1,2,AndreasReingruber1,PeterDietrich1,JunRui2,AlexanderDück1,ThorstenStrassel1,LiLi2,Nai-LeLiu2,BoZhao2*1,2andJian-WeiPan

3、*Quantummemoriesareregardedasoneofthefundamentaldifficult.Therefore,inrecentyears,manyeffortshavebeendevotedbuildingblocksoflinear-opticalquantumcomputation1andtowardsimprovingtheretrievalefficiencyandthelifetimeoflong-distancequantumcommunication2.A

4、long-standinggoalquantummemoriesandsignificantprogresshasbeenachieved.torealizescalablequantuminformationprocessingistobuildHowever,anefficientandlong-livedquantummemoryremainsalong-livedandefficientquantummemory.Therehavebeenchallenging.Forexample,th

5、elifetimeoftheatomicquantumsignificanteffortsdistributedtowardsthisgoal.However,memoryhasbeenexperimentallyimprovedtothemillisecondeitherefficientbutshort-lived3,4orlong-livedbutinefficientregimeeitherbyincreasingthespinwavewavelength5orconfiningquantum

6、memories5–7havebeendemonstratedsofar.Heretheatomsinanopticallattice6,7,buttheintrinsicretrievalwereportahigh-performancequantummemoryinwhichefficiencyislessthan25%.Efficientquantummemorieshavebeenlonglifetimeandhighretrievalefficiencymeetforthefirstdem

7、onstratedinatomic3andsolid-statemedia4,reachingretrievaltime.Byplacingaringcavityaroundanatomicensemble,efficienciesupto84%and69%,respectively.However,theobservedemployingapairofclockstates,creatingalong-wavelengthlifetimeswereseverelylimited(240nsan

8、d3srespectively).Thespinwaveandarrangingtheset-upinthegravitationalinabilitytoachievebothlonglifetimeandhighretrievalefficiencydirection,werealizeaquantummemorywithanintrinsicinasinglequantummemorystronglylimitsmoreadvancedspinwavetophotonconversion

9、efficiencyof73(2)%togetheroperations,suchascreatingorpurifyingentanglement22betweenwithastoragelifetimeof3.2(1)ms.Thisrealizationprovidestwoormorequantumrepeaternodesorentanglingsixatomicanessentialtooltowardsscalablelinear-opticalquantumensemblestoge