腔QED系統(tǒng)中的遠程態(tài)制備及兩量子比特海森堡自旋模型的糾纏特性.pdf

1、華東師范大學碩士學位論文腔QED系統(tǒng)中的遠程態(tài)制備及兩量子比特海森堡自旋模型的糾纏特性姓名：徐曉波申請學位級別：碩士專業(yè)：光學指導教師：劉金明20080501AbstractAbstractQuantuminfoHnationscienceisthecombinationofquannlllnmedlanicsandinformationscience，whichmainlyincludesquantumcoml)utationandq

2、uant啪communicationBecausequantu|nstateistheca幣erofinf0啪ation，antheproblemsrelatedtoinfo肌ationshouldbesolvedbymeansofquaJltumtheoryTherefore，quantuminfo加ationscienceexhibitsanumberofadvantagesincontrasttoclassicalcounterp

3、artTbrealizequantllminfo咖ationprocessingscientistneedtofindarealphysicalsyst鋤aLsthequantumhardwarewhichcanrealizecontrollablequbitsCaVityQEDsyStemisregardedaSoneofthemostpromisingsystemstealizequantumhardwareTheideaofthe

4、caVityQEDistotrapseveralatomsinasmallhi曲qualitycaVityQuantuminfo肌ationcanbestoredinmeintemalstatesoftheatomsThetrappedatomscanprovidequantummenloryandopticalcaVitiescanbeutilizedbothtoperfonllquantumgatesaIldto缸ansfhquan

5、tuminfomationCaVityQEDsystemcallbeusedforachieVingquantuminfomationprocessingsuchasquantumtel印ortation，thepr印arationa11dmaJlipulationoftheentangledstates，therealizationofquantum10西cgates，andsoonOntheotherhand，Heisenbergs

6、pinchainasasolidsystemwhichrealizesqubitshasattractedmuchattentionforitsscalabilityandflexibiIityIthasbeenwidelyusedtoachievequaJltlJmsimulation，suchasquantumdots，nuclearspins，electricspins，andsoonBasedonthetechnologyofc

7、avityQED，weproposetwokindsofschemesf0rremotepr印arationofathreeatomGHZclassstateSincethecavityusedinourschemesisonlyvirtuallyexcitedintheinteractionprocess，thereisnoquantuminfo腫ationtransfersbetweenatomsandcaVitiesSooursc

8、hemeisimmunetobothcavitydecayandmeeffectofthethennalfield，andtherequirementonthequalitvfactorofmecavityis盯eatlyloosenedandmee伍cientdecoherencetimeofthecavitVis鏟eatlypr010ngedInaddition，bychoosingappropriateinteractiontim

9、eweneednotintroduceanyadditionalatomsorcavitieswhichgreatlyreducethecostofbothquantumandclassicalresourcesInaddition，weconsidertheentanglementofatwo—qubitanisotropicHeisenbergXYZdlaininnonunifonnma毋1eticfieldswithintrins

10、icdecoherencebycalculatingtheconcurrenceItisshownthatma印eticfieldhasef艷ctontheevolvementofthesvstemfordifferentinitialstates。theunifonnandnonunifonncomponentofthema印eticfieldplaydifferentrolesintheevolvementofmesvstemWea

11、lsofindthattheinitialstateissensitivetotheev01vementofasystem，whichindicatesthatthelargerconcurrencetheinitialsVstemcontains，thehi211erconcu盯encethesvstemwillretainatlastKeywords：CaVityQED，GHZclassstate，Renlotestatepr印ar