CAJ | 학술논문

采用Negativity理论研究了具有Dzyaloshinskii-Moriya(DM)相互作用的伊辛模型在非均匀磁场中的纠缠特性.结果发现,DM相互作用的存在明显增强了两量子比特间的热纠缠并且能够把纠缠增加到一个最大值0.5;而外磁场具有减小热纠缠的作用.温度的高低也直接影响热纠缠.另外,讨论了磁场的非均匀性对伊辛链热纠缠的影响,在一定程度上,非均匀磁场对热纠缠的影响类似于匀强磁场.研究表明:可以通过调节DM相互作用强度,外磁场大小和温度高低来控制热纠缠.
채용Negativity이론연구료구유Dzyaloshinskii-Moriya(DM)상호작용적이신모형재비균균자장중적규전특성.결과발현,DM상호작용적존재명현증강료량양자비특간적열규전병차능구파규전증가도일개최대치0.5;이외자장구유감소열규전적작용.온도적고저야직접영향열규전.령외,토론료자장적비균균성대이신련열규전적영향,재일정정도상,비균균자장대열규전적영향유사우균강자장.연구표명:가이통과조절DM상호작용강도,외자장대소화온도고저래공제열규전.
Taking Dzyaloshiuskii-Moriya (DM) effect interaction into account, the entanglement of twoqubit Ising model in an inhomogeneous magnetic field is investigated by means of Negativity theory. It is shown that the existence of DM interaction can obviously enhance the entanglement and put it into a maximum while the magnetic field reduces the entanglement. In addition, low temperature also plays a positive role in entanglement. Moreover, the influence of inhomogeneous magnetic field is also investigated.These effects indicate that one can control the thermal entanglement by manipulation of DM interaction,the homogeneous and inhomogeneous magnetic field and temperature.