资源描述：
《Experimental Demonstration of a Controlled-NOT Wave-Packet Gate.pdf》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、VOLUME89,NUMBER26PHYSICALREVIEWLETTERS23DECEMBER2002ExperimentalDemonstrationofaControlled-NOTWave-PacketGateB.DeMarco,A.Ben-Kish,*D.Leibfried,V.Meyer,M.Rowe,B.M.Jelenkovic´,W.M.Itano,J.Britton,C.Langer,T.Rosenband,andD.J.WinelandNIST,TimeandFrequencyDivision,IonStorageGroup,Boulder,Colo
2、rado80305(Received20August2002;published9December2002)Wereporttheexperimentaldemonstrationofacontrolled-NOT(CNOT)quantumlogicgatebetweenmotionalandinternal-statequbitsofasingleionwhere,asopposedtopreviouslydemonstratedgates,theconditionaldynamicsdependsontheextentoftheionswavepacket.Adva
3、ntagesofthisCNOTgateoveronedemonstratedpreviouslyareitsimmunityfromStarkshiftsduetooff-resonantcouplingsandthefactthatanauxiliaryinternallevelisnotrequired.Wecharacterizethegatelogicthroughmeasurementsofthepostgateionstatepopulationsforbothlogicbasisandsuperpositioninputstates,andwedemon
4、stratethegatecoherenceviaaninterferometricmeasurement.DOI:10.1103/PhysRevLett.89.267901PACSnumbers:03.67.Lx,32.80.QkConsiderableattentionisnowfocusedondevelopingThequbitsinourimplementationoftheCNOTgatearequantumcomputertechnologyacrossadiversesetofspannedbytheinternalandmotionallevelsof
5、asinglephysicalsystems[1,2].Usinglasercooledtrappedatomictrapped9Beion[10,13].Thetargetstates,abbreviatedionsforquantumcomputingandinformationprocessingbytheanalogousspin-1=2statesj#iandj"i,arethejF[3]carriesmanyadvantagesasmostofthebasicbuilding2;mF2iandjF1;mF1ihyperfinestatesofbloc
6、ksofquantumcomputinghavebeendemonstrated,the9Be2Selectronicgroundstate.Thecontrolqubit1=2includinghighefficiencystateinitializationandreadoutconsistsofthegroundandsecondexcitedstates(j0iand[49],entanglinggates[10,11],individualaddressing[8],j2i)ofthequantizedstatesjnioftheharmonicionmoti
7、onandlongqubitcoherencetimes[9,12].Areasofconcen-alongthetrapaxisorzdirection.Coherentmanipulationtrationforcurrentworkwithtrappedionsincludesim-ofthefourqubitstatesandtheCNOTgateactionisplifyingquantumlogicoperationsandincreasingtheiraccomplishedbydrivingtwo-photonRamant
