Open AccessOn the properties and controlling of thermal entanglement in a two-qubit Heisenberg XY model with external magnetic fields
Author(s) -
Du Xiu-Mei,
ZhongXiao Man,
YunJie Xia
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.7457
Subject(s) - quantum entanglement , qubit , physics , magnetic field , thermal , heisenberg model , quantum mechanics , field (mathematics) , condensed matter physics , quantum , ferromagnetism , thermodynamics , mathematics , pure mathematics
We investigate the thermal entanglement of Heisenberg-type coupled two-qubit system in the presence of two controllable magnetic fields (B+b) and (B-b). We find that under the condition of low temperature and uniform magnetic field, the entanglement between the two qubits exhibits platform-like behavior. By controlling the inhomogeneous magnetic field b and selecting suitable material we can optimize the thermal entanglement and enhance the critical temperature Tc of dead entanglement. We also find that the entanglement switch can be realized in a broader region of temperature by modulating the uniform field B.