Phys. Rev. A 68, 044301 (2003) [4 pages]Thermal entanglement in the two-qubit Heisenberg XY model under a nonuniform external magnetic fieldReceived 23 May 2003; published 6 October 2003 We investigate the thermal entanglement in the two-qubit Heisenberg XY model with a nonuniform magnetic field. Concurrence, the measurement of entanglement, is calculated. The behavior of concurrence is present at three different cases. Contrary to the uniform magnetic field case, we find that the entanglement and the critical temperature TC may be enhanced under a nonuniform magnetic field. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.68.044301
DOI:
10.1103/PhysRevA.68.044301
PACS:
03.67.Lx, 03.65.Ud, 75.10.Jm
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.