量子密鑰分發(fā)的光纖實驗方案與單光子探測技術(shù).pdf

1、北京交通大學碩士學位論文量子密鑰分發(fā)的光纖實驗方案與單光子探測技術(shù)姓名：李克軒申請學位級別：碩士專業(yè)：光學指導(dǎo)教師：李文博吳令安20031201AbstractAbstractKeydistributionistheartofsharingasecretkeybetweentwocooperativeplayersAliceandBobinthepresenceofaneavesdropperEve.Informationsecurit

2、yhasalwaysbeenofgreatimportancetoeverynationeverygroupandeveryperson.Thesecurityofquantumcryptographyisbasedontwoprinciplesoffundamentalphysicsi.e.Heisenbergsuncertaintyprincipleandthequantumnoncloningprincipleandguarant

3、eesabsolutesecurityofthecryptographickeywithoutassumptionsabouttheresourcesavailabletoapotentialadversary.QuantuminformationiscurrentlyoneofthehotestresearchfieldsinphysicsandQKDisthemostadvancedsubfieldsofarwithregardto

4、practical即plication.Thisthesisreportstheexperimentalandtheoreticworkofourgroupstudiesinthequantumkeydistributionandafiberopticquantumkeydistribution(QKD)materialschemebasedonphaseencodedsingle戶otonhasbeingdevelopedinourg

5、roup.Thetheoreticalbackgroundofquantumkeydistributionisfirstpresented.Itsexperimentalrealizationandrecentdevelopmentsarethendescribed.Emphasisisplacedon奴discussionofthebasicprinciplesandthedescriptionoftheconventionalsch

6、emes.ThispaperpresentsnovelQKDschemesthatusethreeasymmetricMachZehnderinterferometerandaphasemodulator.Theadvantagesofthisnewschemearenumerous:(1)theefficiencywithwhichtransmiteddatacontributetotheprivatekeyisincreased.(

7、2)確acentstatesexperiencethesamepolarizationchangeandthusperfect妙interferewitheachother.(3)Bobdoesnotneedaphasemodulator.Wehavedesignedandfabricatedapolarizationindependentphasemodulatorwhichgreatlyenhancethefringevisibil

8、ityofsinglephotointerference.Theamountofworkthatweadjustbeampathisbeendecreased.Wehaveconstructedour~singlephotondetectorwhichhadintegratedpowersupplycircuitthermoelectricrefrigerationcircuitamplifierdiscriminatorcircuit

9、activelyquenchedcircuitandsoon.Wedolikethisforitsconvenience.Atthesametimeamethodtomeasuresinglephotonresultsobtained.sourceusingdetecttechniquehasbeendesignedandpreliminaryKeyWords:Quantumkeydistribution(QKD)BB84protoco