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1、QuantumInfProcess(2013)12:26232636DOI10.1007/s11128-013-0548-2PredominanceofentanglementofformationoverquantumdiscordunderquantumchannelsSteveCampbellReceived:22November2012/Accepted:12February2013/Publishedonline:7March2013©SpringerScience+BusinessMediaNewYork2013AbstractWepresentastudyofthebehav
2、ioroftwodifferentfiguresofmeritforquantumcorrelations,entanglementofformationandquantumdiscord,underquantumchannelsshowinghowtheformercan,counterintuitively,bemoreresilienttosuchenvironmentsspoilingeffects.Byexploitingstrictconservationrelationsbetweenthetwomeasuresandimposingnecessaryconstraintson
3、theinitialconditionsweareabletoexplicitlyshowthispredominanceisrelatedtobuild-upofthesystem-environmentcorrelations.KeywordsEntanglement·Opensystems·Quantumdiscord·Quantumcorrelations1IntroductionTheunderstandingofquantumcorrelationshascomealongwaysinceSchrödingersfirstmentionofentanglement[1,2].It
4、iswellestablishedthepotentialadvantagesthatquantumcorrelatedsystemsofferoverclassicalcounterparts.Despiteasubstantialunderstandingofbipartiteentanglement,andmoregenerallynon-classicality,westilllackafundamentaldescriptionofquantumcorrelations.Withinaparticularfigureofmeritsdescriptionthereareorderi
5、ngproblemsassociatedwithmixedstates[37],whilemeanstoquantifyandclassifymultipartitecorrelationsarestillintheearlystagesofbeingdeveloped[810].QuantumcorrelationsareatthecoreofquantumS.Campbell(B)QuantumSystemsUnit,OkinawaInstituteofScienceandTechnology,Okinawa904-0495,Japane-mail:steve.campbell@ois
6、t.jpS.CampbellDepartmentofPhysics,UniversityCollegeCork,Cork,RepublicofIrelande-mail:quantum.wizard1@gmail.com1232624S.Campbellinformationprotocols,andmorerecentlytheyhavebeenlinkedexplicitlytoquantumphasetransitions[1113]andeveninhowbiologicalsystemsbehave[14,15].Asitbecomesclearerthatquantumcorr
7、elationsarecentraltohowphysicalsystemsbehave,acompleteunderstandingofthemisrightlyofgreatimportance.Whenaddressingtheissuesarisingwhendealingwithmixedstates,oneisimplicitlyaskingthequestionofhowquantumsystemsinte
