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22、nandquantumcomputationcombinesquantummechanics,physics,computerscience,informationscienceandmathematics,isoneofthemostactivesubjectsinrecentdecadeyears,andhastremendousapplicationvalueandscientificsignificance.Inthemathematicalframeworkofquantumtheory,aquantumsystemisassociatedwithaseparableco
23、mplexHilbertspaceHandquantumstatesarepositiveoperatorsonHwithunittrace.Aquantumchannelisatrace-preservingcompletelypositivelinearmapbetweentraceclassoperators.Inthisthesis,westudythechannels,entropyexchangeandrelatedtopicsforinfinite-di