Thermal entanglement in a two-qutrit system with nonlinear coupling under nonuniform external magnetic field

Details Thermal entanglement in a two-qutrit system with nonlinear coupling under nonuniform external magnetic field Thermal entanglement in a two-qutrit system with nonlinear coupling under nonuniform external magnetic field

2007-05-24

arxiv.org/abs/0705.3568v2

Int. J. Quant. Inform. 6 (2008) 867

Physics

Quantum Physics

18 pages, 6 figures; The revised version, Some more sections and references are added

Scientific paper

We study the thermal entanglement of a 2-qutrit spin chain with nonlinear coupling in the presence of nonuniform magnetic field. Thermal entanglement of an arbitrary (finite dimensional) m-partite system vanishes at some finite threshold temperature T_s. We investigate the dependence of T_s on the system's parameters, i.e. the nonlinear coupling and the magnetic field, for this 2-qutrit system. In addition, we compare two lower bounds of I-concurrence for this system and also study its dense coding capacity as a function of system's parameters.

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