腔光机械谐振器的动力学耗散冷却（英文）.pdf

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1、第36卷第1期吉首大学学报(自然科学版)Vo1．36No．12015年1月JournalofJishouUniversity(NaturalScienceEdition)Jan．2015ArticleID：1007—2985(2015)01—0021～07DynamicalDissipativeCoolingofaCavityOpto-MechanicalOscillatorMIXianwu，LIXiuhong(1_DepartmentofPhysicsandInformationEngineering，HuaihuaUniversity，Huaihua4180

2、00，HunanChina；2．CollegeofPhysics，MechanicalandElectricalEngineering，JishouUniversity，Jishou416000，HunanChina)Abstract：Thedynamicalcoolingprocessofacavityopto—mechanicalsystemisinvestigatedbyamastere一0uation．Themcanphononnumberiscalculatedusingthecovarianceapproach．Firstly，theeffectof

3、dif—fcrentcavitydissipationrateonthemeanphononnumberisdiscussedinthestrongcouplingsystem．Thenthevariationofmeanphononnumberchangingwithdifferentparametersintheweakandstrongcouplingsystemiscompared．Forstrongcouplingregime，themeanphononnumberoscillatesperiodicallywiththeincreaseofcoupl

4、ingstrengthanditdecreasesfastasthecavitydissipationrateincreases．Final—ly，itreachesacoolinglimit．Intheweakcouplingregime，themeanphononnumberincreasesfastasthecavitydissipationrateincreasesanditreachesequilibriumintheend．Keywords：dynamicaldissipativecooling，meanphononnumber，strongcoup

5、lingsystemCLCnumber：047Documentcode：ADOI：10．3969／j．issn．1007—2985．2015．01．0071IntroductionAsweallknow，opticalmicro—cavity，nano—mechanicalandelectricalsystemshavebeenwidelyused，butrecentlythereisothertwoindependentsystemscoupledtogetherthroughinteractionbetweenradia—tionlightpressures

6、．Actually，inthepast50yearstheradiationlightpressureandtherelevantphysicsre—searchhavelongbeenrecognizedasanimportantsubjectintheatomicphysics，andtheresultingcavitymechanicalsystemiscloselyrelatedtothem．Theproblemofcoolingthemechanicaloscillatorhasbeenaresearchhotspotinrecentyears．Now

7、themostconcernedproblemishowtocooltheoscillatortothegroundstateofenergy．Becausewewanttoseemanyfancyquantumphenomenaaftercoolingtheoscilla—tortothegroundstate，suchastheSchr6dingercatstate，quantumentangledstate，etc．Fordifferentvi—brationfrequencyoftheoscillator，thecorrespondinggroundst

8、atetemperatu