Enhancement of thermal entanglement in two-qubit XY models

Details Enhancement of thermal entanglement in two-qubit XY models Enhancement of thermal entanglement in two-qubit XY models

2002-06-04

arxiv.org/abs/quant-ph/0206018v2

J. Opt. B 5, 73 (2003)

Physics

Quantum Physics

4 PS figures, to appear in Journal of Optics B

Scientific paper

10.1088/1464-4266/5/1/310

We analyze conditions leading to enhancement of thermal entanglement in two-qubit XY models. The effect of including cross-product terms, besides the standard XY exchange interactions, in the presence of an external magnetic field, is investigated. We show that entanglement can be yield at elevated temperatures by tuning the orientation of the external magnetic field. The details of the intrinsic exchange interactions determine the optimal orientation.

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