Various thermal correlations as well as the effect of intrinsic decoherence on the correlations are studied in a two-qubit Heisenberg XYZ spin chain with the Dzyaloshinski–Moriya(DM)interaction along the z direction,...Various thermal correlations as well as the effect of intrinsic decoherence on the correlations are studied in a two-qubit Heisenberg XYZ spin chain with the Dzyaloshinski–Moriya(DM)interaction along the z direction,i.e.Dz.It is found that tunable parameter Dz may play a constructive role on the concurrence C,classical correlation(CC)and quantum discord(QD)in thermal equilibrium while it plays a destructive role on the correlations in the intrinsic decoherence case.The entanglement and quantum discord exhibit collapse and revival under the phase decoherence.With a proper combination of the system parameters,the correlations can effectively be kept at high steady state values despite the intrinsic decoherence.展开更多
We investigate the effects of diferent components of the Dzyaloshinskii-Moriya(DM)anisotropic antisy mnetricinteraction on optimal dense coding with a two-qubit Heisenberg XXZ chain in the presence and in the absenceo...We investigate the effects of diferent components of the Dzyaloshinskii-Moriya(DM)anisotropic antisy mnetricinteraction on optimal dense coding with a two-qubit Heisenberg XXZ chain in the presence and in the absenceof external imagnetic fields.The anisotropic coupling parameter△,isotropic coupling parameter J,and the DMinteraction paraneters are found to be efective for optimal dense coding,while the magnetic field turns out tobe destructive.Moreover,the results show that the case of antiferromagnetic(AFM)is more ideal for optimaldense coding than the case of ferromagnetic(FM)in general.In the case of AFM,by comparison of the two caseswith the sane fixed x-and z-component parameters of DM interaction(D_(x)and D_(z)),the appropriate model foroptimal dense coding is indicated for the different value intervals of△.Comparison of the effects of D_(x)and D_(z)on optimal dense coding is made and their dominant regions are clarified.展开更多
基金Supported by the Natural Science Foundation of Xinjiang Uyghur Autonomous Region(No 2012211A052)the Key Discine of Theoretical Physics Graduate Student Innovation Fund of Xinjiang Uyghur Autonomous Region,China(No LLWLY201101).
文摘Various thermal correlations as well as the effect of intrinsic decoherence on the correlations are studied in a two-qubit Heisenberg XYZ spin chain with the Dzyaloshinski–Moriya(DM)interaction along the z direction,i.e.Dz.It is found that tunable parameter Dz may play a constructive role on the concurrence C,classical correlation(CC)and quantum discord(QD)in thermal equilibrium while it plays a destructive role on the correlations in the intrinsic decoherence case.The entanglement and quantum discord exhibit collapse and revival under the phase decoherence.With a proper combination of the system parameters,the correlations can effectively be kept at high steady state values despite the intrinsic decoherence.
基金Supported by the National Science Foundation of China under Grant No 10064004the Priority Subjects Program for Theoretical Physics of XJNU.Jiang-Tao Cai also acknowledges the support of the Science and Technology Innovative Foundation for Graduate Students of XJNU under Grant No 20091204Yan-Kui Bai also acknowledges the support of the National Science Foundation of China under Grant No 10905016.
文摘We investigate the effects of diferent components of the Dzyaloshinskii-Moriya(DM)anisotropic antisy mnetricinteraction on optimal dense coding with a two-qubit Heisenberg XXZ chain in the presence and in the absenceof external imagnetic fields.The anisotropic coupling parameter△,isotropic coupling parameter J,and the DMinteraction paraneters are found to be efective for optimal dense coding,while the magnetic field turns out tobe destructive.Moreover,the results show that the case of antiferromagnetic(AFM)is more ideal for optimaldense coding than the case of ferromagnetic(FM)in general.In the case of AFM,by comparison of the two caseswith the sane fixed x-and z-component parameters of DM interaction(D_(x)and D_(z)),the appropriate model foroptimal dense coding is indicated for the different value intervals of△.Comparison of the effects of D_(x)and D_(z)on optimal dense coding is made and their dominant regions are clarified.
