Quantum entanglement investigation on impurity effects in the transverse Ising chain
The impurity effects of the transverse Ising spin model with a magnetic impurity are investigated via the correlation function and entanglement on the basis of an exact solution.The non-analytical transition point from an ordered phase to a disorder phase is significantly shifted by the impurity coupling with local host spins.The maximal entanglement point which usually appears around the critical point shows strong dependence on the impurity coupling strength with local host spin and the independent transverse field upon the impurity itself.Quantum entanglement in disordered spin phase is much stronger than that in ordered spin phase.The exact concurrence of impurity spin with local host spin suddenly increases to a large value from zero at a threshold value.The maximal entanglement point between impurity and local host spin increases as the impurity coupling strength increases.So the impurity coupling strength and local transverse field on the impurity can control position of critical point and maximal entanglement point.
Impurity effect Quantum entanglement Correlation function Concurrence
Xuchu Huang Tieyan Si Zhihua Yang
Key Laboratory of Functional Materials and Devices for Special Environments of CAS,Xinjiang Technica Harbin Institution of Technology,92 West Dazhi Street,Nan Gang District,Harbin 150001,China Key Laboratory of Functional Materials and Devices for Special Environments of CAS,Xinjiang Technica
国内会议
大连
英文
960-964
2016-09-24（万方平台首次上网日期，不代表论文的发表时间）