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1、Superconductingqubitinwaveguidecavitywithcoherencetimeapproaching0.1msChadRigetti,1StefanoPoletto,1JayM.Gambetta,1B.L.T.Plourde,2JerryM.Chow,1A.D.Corcoles,1JohnA.Smolin,1SethT.Merkel,1J.R.Rozen,1GeorgeA.Keefe,1MaryB.Rothwell,1MarkB.Ketchen,1andM.Ste en11IBMT.J.WatsonResearchCenter,Yo
2、rktownHeights,NY10598,USA2DepartmentofPhysics,SyracuseUniversity,Syracuse,NewYork13244-1130,USAWereportasuperconductingarti cialatomwithanobservedquantumcoherencetimeofT2=95sandenergyrelaxationtimeT1=70s.ThesystemconsistsofasingleJosephsonjunctiontransmonqubitembeddedinanotherwisee
3、mptycopperwaveguidecavitywhoselowesteigenmodeisdisper-sivelycoupledtothequbittransition.Weattributethefactoroffourincreaseinthecoherencequalityfactorrelativetopreviousreportstodevicemodi cationsaimedatreducingqubitdephas-ingfromresidualcavityphotons.Thissimpledeviceholdsgreatpromiseas
4、arobustandeasilyproducedarti cialquantumsystemwhoseintrinsiccoherencepropertiesaresucienttoallowtestsofquantumerrorcorrection.PACSnumbers:03.67.Ac,42.50.Pq,85.25.-jSuperconductingquantumcircuitsarealeadingcan-chitecture?Theweightandurgencyofthesequestionsdidatetechnologyforlargescale
5、quantumcomputing.areincreasedbyimplicationsonscalingpotential:iftheTheyhavebeenusedtoshowaviolationofaBell-typeresultsarereproducibleanddecoherencetimescanbeex-inequality[1];implementasimpletwo-qubitgatefavor-tendedclosetothe2T1limitforobservedT1times,thisableforscaling[2];generatethr
6、ee-qubitentanglementtechnologybecomesastrongcandidatefortheimmedi-[3];performaroutinerelevanttoerrorcorrection[4];ateconstructionofprototypeprocessorsfortestingQECandveryrecentlytodemonstrateauniversalsetofquan-withoutsigni cantneedoflongercoherence.Itwouldtumgateswith delitiesgreater
7、than95%[5].Mostofalsosuggestthatotherdesignsemployingsmallangle-thesedevicesemploysmallangle-evaporatedJosephsonevaporatedjunctions(e.g.traditionalplanarintegratedjunctionsastheircriticalnon-linearcircuitcomponents.superconductingcircuits)couldpotentiallyattainsimilarDevicesdesignsapp
8、earto
